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1
Morrison, Elizabeth. "The contribution of Australian wheat and wheat products essential trace mineral intake". Thesis, Queensland University of Technology, 1996. https://eprints.qut.edu.au/36731/1/36731_Morrison_1996.pdf.
Testo completoAbstract (sommario):
Nutrition authorities' current recommendations include an increased consumption of whole grain cereal products, including wheat products, in order to increase consumption levels of dietary .fibre. However, the essential trace mineral contribution of such products tends to be underestimated. The trace mineral data for Australian wheat and wheat products, moreover, tends to be lacking or out-of-date. Consequently, a survey was conducted to obtain information on the nutritional value of wheat and wheat products with regard to trace minerals. Wheat grain samples were procured from around Australia, over two seasons in most cases. A method was developed utilising a microwave digestion procedure and inductively-coupled plasma atomic emission spectroscopy (ICP-AES) to analyse these samples for the following minerals (mean result of 233 samples in parenthesis): magnesium (1160mg/kg), zinc (18mg/kg), iron (30mg/kg), manganese (33mg/kg), copper (3.2mg/kg), nickel (0.30mg/kg), chromium (0.04mg/kg), cobalt (0.03mg/kg), cadmium (less than detection limit) and aluminium (3.7mg/kg). Mineral content was, generally, strongly correlated (positively) with protein content. Significant geographical and seasonal variations in the mineral content of wheat grain were identified. A number of wheat products were also analysed as above. An assessment of the contribution of wheat and wheat products to the mineral intake of a general adult Australian population was explored and concluded to be significant.
2
Shahsavani, Shahin. "Sulphur nutrition and wheat production in northern Iran". Thesis, University of Newcastle Upon Tyne, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391969.
Testo completo
3
Krishnasamy, Karthika. "Sodium and cultivar effects on potassium nutrition of wheat". Thesis, Krishnasamy, Karthika (2015) Sodium and cultivar effects on potassium nutrition of wheat. PhD thesis, Murdoch University, 2015. https://researchrepository.murdoch.edu.au/id/eprint/29246/.
Testo completoAbstract (sommario):
In arid and semiarid regions, soil salinity is largely due to excessive sodium chloride (NaCl) which, apart from osmotic and specific Na+ and Cl- ion effects, has a detrimental effect on potassium (K) uptake and nutrition of most crops. However, in K deficient soils, Na+ can substitute for some functions of K+, provided that plants have the ability to take up, translocate, and compartmentalise Na+ into the vacuoles where it mainly replaces the biophysical functions of K+ in maintaining cell turgor, ionic balance, regulating osmotic potential and improving water balance via stomatal conductance. Potassium deficiency and soil salinity stress have become increasingly common in agricultural lands of Western Australia (WA) and many parts of the world, but the role of Na in K nutrition of wheat (Triticum aestivum L.) is not well understood. The interaction between K and Na in wheat genotypes differing in K-use efficiency has not been researched previously. This research focussed mainly on low to moderate concentrations of Na in wheat K nutrition and less emphasis is placed on Na toxicity effects as there is a large body of research available on Na toxicity effects. A series of glasshouse experiments were designed for both soil and solution culture where Na was supplied at a range of concentrations at low and adequate K levels. The responses of K-efficient and K-inefficient Australian wheat cultivars were examined. Plant responses were assessed by measuring plant growth, leaf gas exchange, shoot and root K and Na concentrations and their contents. High soil Na levels (100 and 200 mg Na/kg) greatly reduced the plant growth in wheat cultivars predominantly at low soil K (40 mg K/kg). By contrast, low to moderate Na levels (25 and 50 mg Na/kg in soil culture and 2 mM Na in solution culture) stimulated wheat growth at low K supply, particularly in K-efficient cultivars compared with K-inefficient cultivars. Roots were more responsive to low concentrations of Na than shoots in experiments where growth stimulation was observed. Low to moderate Na supply also increased leaf net photosynthesis and stomatal conductance at low K supply, with the measured values similar to those observed under adequate K condition both in soil and solution culture. In the split-root experiment, the positive effects of moderate soil Na on growth and K uptake of low K plants were evident when K and Na were supplied in the same or different parts of the root system. In low K soil, low to moderate Na levels increased plant K content, particularly shoot K content, which may account for the increased leaf net photosynthesis rate, stomatal conductance, and plant dry weight. In contrast to previous reports, which attributed Na stimulation of plant growth at low K to increased Na+ uptake and utilisation in place of K+, in wheat, Na+ increased K+ uptake in soil culture, and it increased Rb+ uptake (as a tracer of K+) in solution culture experiments. Hence we attribute most of the benefits of low to moderate Na application in wheat to improved K uptake and K nutrition. The main mechanism for Na+-stimulated K+ uptake under limited K availability with low external Na supply in wheat is likely the effect of Na+ on K+ transporters, both on high-affinity and low-affinity K+ uptake transport systems. In this study, K-use efficiency among wheat cultivars showed varied responses to Na supply at low K, with increased stimulation in root growth, shoot K concentrations, K uptake and leaf photosynthesis in K-efficient cultivar relative to K-inefficient cultivar. Genotypic differences in K-use efficiency also influenced Na uptake and salt tolerance with K-efficient cultivars being more salt tolerant than K-inefficient cultivars. The current research on K+ substitution by Na+ in wheat physiological processes is of great importance in fertiliser management strategies. The application of expensive K fertilisers is limited by poor farmers especially in developing countries, and partial substitution of K by Na in plant nutrition can decrease the cost of production. Based on this study, when K-efficient wheat cultivars are grown under low to moderately saline conditions, the substitution of K by Na was not strong enough to recommend Na-based fertilisers in place of K in wheat. Nevertheless, the alleviation of K deficiency symptoms in wheat by addition of moderate Na provides a trigger for conducting further studies. The present research based on glasshouse experiments needs to be evaluated under field conditions with further studies under varying soil and agro-climatic conditions to define critical soil levels of Na that stimulate wheat growth.
4
Zahedi, Morteza. "Physiological aspects of the responses of grain filling to high temperature in wheat". Title page, abstract and contents only, 2001. http://web4.library.adelaide.edu.au/theses/09PH/09phz19.pdf.
Testo completoAbstract (sommario):
"June 2001." Includes bibliographical references (leaves 217-248). The effects of a sustained period of moderately high temperature on physiological and biochemical aspects of grain development were investigated in wheat cultivars grown under controlled environment conditions. The effect of variation in plant nutrition on the responses of cultivars to high temperature was also studied.
5
Kgope, Barney Stephen. "Effects of sustained elevated CO2 concentration and Nitrogen nutrition on wheat (Triticum aestivum L. cv Gamtoos)". Thesis, Rhodes University, 2000. http://hdl.handle.net/10962/d1003774.
Testo completoAbstract (sommario):
There is consensus that high CO2 results in enhanced growth and yield for most crop plants. However, most of these studies were carried out in the presence of adequate nutrients, which is also the case in agricultural systems (managed ecosystems). About 20% of the earth’s land mass have sufficiently low levels of nutrients to cause some kind of stress to plants. On the other hand, elevated [CO2] decreases foliar nutrient elements in plants and as a result partitioning of certain nutrient elements in plants is altered. Little data is available on the partitioning of most nutrient elements in plants, and this will definitely impact on growth and yield. To investigate this, wheat (Triticum aestivum L. c.v. Gamtoos) was grown in controlled environment cabinets at 360 and 700 µmol mol -1 CO2. The full Long-Ashton nutrient solution comprising of three-nitrogen concentrations ([N]) viz. (4,6 and 12 mM) was used to water plants everyday. The measurement of net assimilation rate (NAR), stomatal conductance (gs), transpiration rate (E), water use efficiency (WUE), foliar [N], nitrogen use efficiency (NUE) and growth parameters (total plant biomass (TPB), total plant height (TPH), leaf area (LA), shoot and root dry weight) were made 7 days after germination (7 DAG) till the onset of flowering. The increase in nitrogen supply in the order of 4, 6 and 12mM resulted in an increase in NAR, g_s_ , WUE and a decline in E under elevated [CO2]. Under elevated [CO2] NAR was observed to increase during the first two weeks reaching its maximum at 14 DAG, thereafter followed by a decline reaching its maximum at 28 DAG. This was later followed by an increase at 35 DAG onwards. Under elevated [CO2], NAR was increased significantly between the nitrogen regimes during the first (7-14 DAG) and the last two (35-42 DAG) weeks. The response of assimilation as a function of internal [CO2] (Ci), showed a decrease with age at ages 14, 28 and 35 DAG. This negatively affected the initial slope and the CO2 saturated photosynthetic rates under all treatments. This suggest that acclimation may have been as a result of both stomatal and biochemical limitations. All the photosynthetic pigment levels (chl_a_, chl_b_, chl_(a+b)_, and C_(x+c)_ ) increased with an increase in nitrogen supply from 4 to 6mM [N]. A 12mM [N] resulted in a significant decline in the photosynthetic pigment levels compared to a 6mM [N]. Chla remained higher than chlb under all treatments. Also, NAR was seen to increase and decrease concomitantly with the photosynthetic pigment levels. Foliar [N] was seen to decrease with an increase in nitrogen supply from 4 to 6 mM [N] under elevated [CO2] and the effects were adverse under the 4mM [N]. Under the 6mM N regime foliar [N] was positively correlated to NAR for elevated [CO2] grown plants. Similarly, E was positively correlated to foliar [N] under the same conditions. Elevated CO2 and increase in nitrogen supply had a pronounced effect on total plant height (TPH), total plant biomass (TPB), leaf area (LA), shoot and root dry weight and nitrogen use efficiency (NUE). The effects were more pronounced under a 6mM [N] as a result of high NUE. However, under 12mM [N] growth was not as expected as a result of lower NUE. Under all treatments shoot dry weight (SDW) was positively correlated to NUE. Anatomical studies revealed that total leaf and midrib thickness was significantly increased with an increase in nitrogen supply under elevated CO2 to support the larger leaf areas. There were no significant changes in the chloroplast ultrastructure as a result of the increase in nitrogen supply and CO2 enrichment. Starch grain surface area was seen to decline with an increase in nitrogen under both ambient and elevated CO2. Elevated CO2 and increase in nitrogen supply significantly increased total grain dry weight per plant by 47 and 46% respectively under 6 and 12mM [N]. In contrast, the increase was by about 21, 61 and 67% respectively under 4, 6 and 12mM [N] between the CO2 regimes.
6
Marmolejo, Gonzalez Alonso. "UTILIZATION OF AMMONIATED WHEAT STRAW BY LACTATING DAIRY CATTLE". Thesis, The University of Arizona, 1985. http://hdl.handle.net/10150/275406.
Testo completo
7
Brewer, Lauren Renee. "Linking cereal chemistry to nutrition: studies of wheat bran and resistant starch". Diss., Kansas State University, 2012. http://hdl.handle.net/2097/14193.
Testo completoAbstract (sommario):
Doctor of PhilosophyDepartment of Grain Science and Industry
Yong-Cheng Shi
Wheat bran is high in dietary fiber. Resistant starch (RS) is considered a source of dietary fiber. Wheat bran and RS have different functional properties and may not have the same nutritional properties. This dissertation covers two areas of importance in cereal chemistry and human nutrition: wheat bran and RS. Wheat bran chemical and physical influence of nutritional components Wheat bran has become a hot topic due to positive nutritional correlations, and industrial /humanitarian needs for healthy ingredients. Evolving wheat bran into a demanded product would impact the industry in a positive way. The overall aim of this research was to understand chemical and structural composition, to provide avenues for wheat bran development as a healthy food ingredient. To achieve this goal, antioxidant properties in dry wheat milling fractions were examined, effects of wheat bran particle size on phytochemical extractability and properties were measured, and substrate fermentation was investigated. It was noted that mixed mill streams, such as mill feed, have antioxidant properties (0.78 mg FAE/g; 1.28 mg/g total antioxidant capacity; 75.21% DPPH inhibition; 278.97 [mu]mol FeSO[subscript]4/g) originating from the bran and germ fractions. Additionally, extraction of reduced particle size whole wheat bran increased measured values for several assays (185.96 [mu]g catechin/g; 36.6 [mu]g/g; 425 [mu]M TE), but did not increase volatile fatty acid production during in vitro rumen fermentation over unmilled bran. RS digestion, glycemic response and human fermentation In vitro action of enzymes on digestion of maize starches differing in amylose contents were studied. The objectives of this study were to investigate the exact role of [alpha]-amylase and amyloglucosidase in determining the digestibility of starch and to understand the mechanism of enzymatic actions on starch granules. Starch digestibility differed (30-60%) without combination of enzymes during in vitro assay. Further investigations utilized human glycemic response and fermentation with consumption of a type 3 RS without dietary fiber (AOAC method 991.43). Blood glucose response provided lower postprandial curves (glycemic index value of 21) and breath hydrogen curves displayed low incidences fermentation (40%) with consumption of the type 3 RS, due to the structure of starch and digestion by enzymatic action.
8
Lyons, Graham Henry. "High-selenium wheat : biofortification for better health /". Title page, table of contents and abstract only, 2004. http://web4.library.adelaide.edu.au/theses/09PH/09phl9915.pdf.
Testo completo
9
Thongbai, Pongmanee. "The influence of Zn nutritional status on the severity of Rhizoctonia root rot of cereals". Title page, table of contents and abstract only, 1993. http://web4.library.adelaide.edu.au/theses/09PH/09pht486.pdf.
Testo completo
10
Rogers, Gordon Stephen. "Influence of N and P nutrition on the responses of wheat and cotton to elevated CO2 /". View thesis, 1996. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20030804.105414/index.html.
Testo completo
11
Kitchen, Julie Louise. "Nutrition and nutrional value of wheat grown in organic and conventional farming systems in South Australia". Title page, table of contents and abstract only, 2001. http://web4.library.adelaide.edu.au/theses/09PH/09phk618.pdf.
Testo completo
12
Godfrey, David Daniel. "The impact of Nutrition on the Development, Composition and Breadmaking Quality of Wheat Grain". Thesis, University of Bristol, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.503886.
Testo completo
13
Bergman, Christine Joy 1960. "Soft wheat pasta supplemented with cowpea: Nutritional, sensory and cooking quality studies". Thesis, The University of Arizona, 1990. http://hdl.handle.net/10150/291602.
Testo completoAbstract (sommario):
Pasta was produced from soft wheat supplemented with cowpea. Acid detergent fiber values increased from 0.4% in the soft wheat pasta (SWP) to 1.1% in the 30% cowpea pasta (CP). Cowpea supplementation provided an increase in total and available lysine from 42 to 113% and 39 to 117%, respectively. Chemical scores for preschool children increased from 56 in the SWP to 89 in the 30% CP. For school children the 20% CP provided a score of 102. The in vitro protein digestibility (IVPD) of cowpea was lower than that of soft wheat; as a result cowpea reduced the IVPD of SWP from 84% to a value of 78% for the 30% CP. The protein content of SWP was 10.9% while the CP ranged from 11.3 to 14.2%. Considering IVPD values, SWP contained 9.2% digestible protein and CP from 9.2 to 11.1%. After cooking, only the 30% CP displayed trypsin inhibitor activity. Upon visual examination, cowpea improved the color of SP making it comparable to the durum semolina control (DSC) but lacking its translucency. A sensory panel reported no difference in acceptability among treatments. Cooked weights were similar to the SWP, except with 30% replacement when a decrease was observed. CP, after 10 minutes of cooking demonstrated reduced loss as supplementation was increased. After 20 minutes all treatments had similar cooking loss compared to the SP. All treatments displayed cooking quality results significantly different from the DSC.
14
Jacobs, Elizabeth Theresa. "Effect of a cereal fiber intervention on nutrient intake and adenoma recurrence in the Wheat Bran Fiber trial". Diss., The University of Arizona, 2001. http://hdl.handle.net/10150/279861.
Testo completoAbstract (sommario):
The Wheat Bran Fiber (WBF) trial was a double-blind, placebo-controlled intervention trial in which participants were randomized to receive a cereal fiber supplement of either 2.0 or 13.5 g/day to determine whether the high-fiber supplement could decrease the risk of recurrent colorectal adenomas. No effect of the supplement was observed. However, there are several issues in the WBF trial that remain to be explored, including whether there were non-supplemental dietary changes throughout the course of the study, and whether baseline fiber intake or the amount of fiber consumed by participants during the trial were associated with adenoma recurrence. With regard to changes in nutrient intake, no significant differences were found between the high-fiber and low-fiber groups at any of the three time points. Therefore, data from the two treatment groups were combined to assess longitudinal change during the study. Participants significantly decreased their fat intake during the trial, but the intake of most micronutrients was increased. With regard to food groups, the number of servings of fruits, vegetables, and dairy products did not change appreciably, while servings from the fat and meat groups were significantly decreased. The intake of cereals, breads and crackers increased significantly, possibly due to the addition of the cereal supplement to the diet. Furthermore, it is likely that the increase in micronutrient intake can be attributed to the consumption of the study supplement. The next issue was whether baseline fiber intake was associated with risk of adenoma recurrence. No association was found between the amount of fiber consumed at baseline and adenoma recurrence, nor did baseline fiber intake modify the effect of treatment group. Finally, it was important to determine whether the amount of fiber consumed during the WBF trial, regardless of treatment group, was associated with adenoma recurrence. There were no significant associations between amount of.
15
Turner, Justin B. "Whole wheat flour milling: effects of variety and particle size". Kansas State University, 2012. http://hdl.handle.net/2097/13658.
Testo completoAbstract (sommario):
Master of ScienceFood Science
Fadi Aramouni
Nutrition from whole grains has become an integral part of a healthy diet. Consumers are focused on adding fiber and whole grains to be healthy and want the benefits of whole grain with the taste and appearance of refined flour. A review of current commercial whole wheat flour in the marketplace indicated many options for food processors to use. However, many of these options required processing changes and added ingredients to provide the consumer with a quality product. A milling and baking study was done to compare commercially and experimentally milled whole wheat flours from both white and red wheat varieties. Both white and red wheat varieties were kept identity preserved. Experimental milling was done with a hammer mill and a roll stand to closely replicate the commercial milling process. Baking was done using a sponge and dough method to closely replicate commercial baking conditions. The results showed both particle size and wheat variety impact bake performance of whole wheat flour. The most significant impact appeared to be dependent on the variety of wheat being milled. The milling process also had an impact. As particle size decreased, bake functionality improved. However, some decreased functionality was seen when particle size became very fine. It was concluded that additional work on a commercial flour mill needed to be done to determine if an optimal particle size for milling whole wheat flour exists. Experimental milling equipment was not adequate enough to replicate particle size distributions of commercial whole wheat mills.
16
Rogers, Gordon Stephen, of Western Sydney Hawkesbury University, of Science Technology and Agriculture Faculty e School of Horticulture. "Influence of N and P nutrition on the responses of wheat and cotton to elevated CO2". THESIS_FSTA_HOR_Rogers_G.xml, 1996. http://handle.uws.edu.au:8081/1959.7/227.
Testo completoAbstract (sommario):
The atmospheric CO2 concentration is rising. These higher CO2 concentrations will certainly affect growth but may also affect nutrient responses of crop plants. The overall aim of this thesis was to investigate the effect of elevated CO2 on the nitrogen and phosphorus nutrition of two different crop species: wheat and cotton. Once establishing the new nutrient requirements of these crop species at elevated CO2 the study focussed on the interactive effects of elevated CO2 and N supply on growth and leaf N concentrations in cotton and wheat, carbohydrate metabolism, source:sink interactions and photosynthetic enzyme levels in the two species. Having established these effects, the role of N supply in controlling source:sink effects on Rubisco concentration were studied at the molecular level in wheat. Finally, some implications of the effect of elevated CO2 on wheat were examined, specifically on the quality of flour produced from wheat grain grown at elevated CO2. The foliar nitrogen concentrations, required to produce maximum shoot growth (critical concentrations) were lower at elevated CO2 while the critical phosphorus concentrations were higher.Doctor of Philosophy (PhD)
17
Schlegel, Ethan R. "Evaluation of ammoniated wheat straw in receiving and growing diets". Thesis, Kansas State University, 2015. http://hdl.handle.net/2097/18871.
Testo completoAbstract (sommario):
Master of ScienceDepartment of Animal Sciences and Industry
Dale A. Blasi
Drought conditions in the past have created a shortage of prairie hay and other grass hays that are used as roughage sources for receiving and growing beef diets. Historically, wheat straw and other cereal crop residue has been discounted as a feedstuff due to its low nutrient content. Chemical methods, including ammonia application, can improve the feeding value of cereal crop residue while constraining costs. While there are studies that show the efficacy of utilizing ammoniated wheat straw in beef cow and maintenance diets, limited data are available characterizing the feeding value of ammoniated wheat straw in receiving and growing diets. The objective of these two studies were to evaluate cattle growth and diet digestibility for receiving and growing diets containing either wheat straw (STRW), anhydrous ammonia treated wheat straw (AMMN), or a prairie hay and alfalfa blend (CONT) at 30% inclusion. Exp. 1 utilized 288 crossbred steers (271 kg) randomized to 8 pens per treatment and fed their respective test diets for 56 d and a common diet for 14 d to equalize gastrointestinal tract fill. No effect of straw ammoniation was observed on final bodyweight (BW), average daily gain (ADG), dry matter intake (DMI), or gain to feed (G:F) (P > 0.31). The 56-d BW, ADG, and G:F for CONT were significantly different from both STRW and AMMN (P < 0.001). Exp. 2 utilized 6 ruminally fistulated Holstein heifers (288 kg) in a replicated 3 × 3 Latin square design. There were no observed differences between AMMN and STRW in dry matter (DM), organic matter (OM), or ADF intake (P > 0.57) although CONT differed significantly from both straw treatments in DM, OM, and ADF intake (P < 0.05). Digestibility of DM, OM, and ADF were not different between AMMN and STRW (P > 0.43), where as CONT and STRW were different (P < 0.05). Anhydrous ammonia treatment of wheat straw had no effect on ruminal VFA concentration (P > 0.32). Ruminal pH was not affected by anhydrous ammonia application (P = 0.32), but STRW and CONT were different (P < 0.05). Fluid passage rate was not different among the three treatments (P = 0.33). Wheat straw is a suitable replacement for ammoniated wheat straw at 30% inclusion in receiving and growing diets that contain 40% of dietary DM as wet corn gluten feed. Further research is necessary to determine the effect of varying levels of wheat straw and ammoniated wheat straw in conjunction with wet corn gluten feed and other by-product feeds in receiving and growing diets in order to capitalize on performance and efficiency gains while constraining costs.
18
Ayella, Allan K. "Wheat lignans and cancer prevention". Diss., Manhattan, Kan. : Kansas State University, 2007. http://hdl.handle.net/2097/335.
Testo completo
19
Wong, H. M. "Probing the interactions between iron nutrition, salinity and ultraviolet-B radiation on the physiological responses of wheat (Triticum aestivum L.)". Diss., Lincoln University, 2009. http://hdl.handle.net/10182/1327.
Testo completoAbstract (sommario):
When plants are exposed to multiple environmental stress factors, one form of stress can affect the response to another stress. This study used seedlings of a new cultivar of wheat(Triticum aestivum L. cv. 1862), grown under factorial combinations of two levels of ultraviolet-B (UV-B)radiation, two salinity regimes and two levels of iron treatment in chelator-buffered nutrient solutions in a growth chamber. A number of morphological and physiological measurements were made. The accumulation of chlorophyll, UVabsorbing compounds and proline in shoots, as well as phytosiderophores (PSs) in root exudates were measured. Feed value measurements included crude protein, water-soluble carbohydrates, acid detergent fibre and Fe in shoots and roots. After 21 days of stress exposure, results showed that Fe deficiency and NaCl stress generally decreased plant growth and function as well as nutritive value, but increased plant biochemical protection traits such as proline accumulation (16.3 fold under salinity stress) and release of PSs (2.4 fold under Fe deficiency). Interestingly, UV-B radiation affected belowground parameters, inducing a 47% reduction in PS release, together with decreasing root DM by 9% and Fe concentration in roots by 7%. When Fe deficiency and NaCl stress were combined, the results showed a decrease in PS release by 3.5 fold compared to unstressed plants. UV-B radiation synergistically increased UV-absorbing compound levels in combination with Fe deficiency, compared to plants grown under optimal Fe levels. This stress combination also resulted in a cumulative effect by decreasing Fe concentration in shoots and roots. However, salt stress did not interact with UV-B radiation for any of the traits measured. In addition, some three-way interactions were noted, with the Fe x NaCl x UV-B stress combination slightly decreasing PS release and resulting in a cumulative effect by decreasing Fe concentration in roots. In conclusion, this study found that aboveground stress factors such as UV-B can affect important aspects of belowground plant function, and that Fe deficiency can interact with UV-B and salinity stress in modifying plant responses to either stress alone.
20
Moller, Leandra. "Soil yeasts, mycorrhizal fungi and biochar: their interactions and effect on wheat (Triticum aestivum L.) growth and nutrition". Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/20417.
Testo completoAbstract (sommario):
Thesis (MSc)--Stellenbosch University, 2012.ENGLISH ABSTRACT: In order to test the effect of different plant growth-promoting strategies on Triticum aestivum L. (wheat), we investigated the ability of biochar and a grain-associated soil yeast, to improve the growth of this crop. Our first goal was to study the effect of biochar amendments to sandy soil on the growth and nutrition of wheat in the presence of mycorrhizal fungi. This was accomplished by amending soil with 0%, 1%, 2.5%, 5% and 10% (w/w) biochar and cultivating wheat plants in these soil-biochar mixtures. After harvesting, plant growth and mycorrhizal colonization of roots were measured. In addition, we studied the nutritional physiology of these plants with regards to nitrogen (N), phosphorous (P) and potassium (K) concentrations, as well as the growth efficiencies and uptake rates of these nutrients. We found that wheat growth was improved by biochar amendments to soil, probably as a result of elevated K levels in the plant tissues supplied by the biochar amendments. The second goal of this study was to obtain a soil yeast from the rhizosphere of another monocot in the family Poaceae, i.e. Themeda triandra Forssk. (red grass), and then evaluate this isolate for its ability to improve wheat performance. Three different Cryptococcus species were isolated from the rhizosphere of wild grass, i.e. Cryptococcus zeae, Cryptococcus luteolus and Cryptococcus rajasthanensis. Since C. zeae was previously isolated from maize, an isolate representing this species was selected to be used in further experimentation. With the ultimate goal of testing the ability of this yeast to improve wheat growth, its effect on wheat germination was investigated and compared to that of two other soil yeasts, i.e. Cryptococcus podzolicus CAB 978 and Rhodotorula mucilaginosa CAB 826. These three yeasts were subsequently tested for their ability to improve wheat growth in pot cultures in a greenhouse. After one and two months of growth, the culturable yeasts present in the rhizosphere and bulk soil were enumerated. The effects of these yeasts were elucidated by measuring wheat growth in terms of dry weight, as well as root and shoot relative growth rates (RGR). Changes in wheat nutrition were evaluated by determining the concentrations, growth efficiencies and uptake rates for P, K, zinc (Zn) and iron (Fe). During this study, it was found that only C. zeae CAB 1119 and C. podzolicus CAB 978 were able to enhance seed germination. Similarly, it was shown that C. zeae CAB 1119 was able to improve wheat growth during the first and second month of cultivation, whereas C. podzolicus CAB 978 only improved growth during the first month, and R. mucilaginosa CAB 826 had no effect on growth. This improved growth could be attributed to C. zeae CAB 1119 improving the P, K, Zn and Fe growth efficiency of wheat, which positively influenced the root and shoot RGR, and subsequently wheat growth. Our final goal was to test whether C. zeae CAB 1119 could affect wheat growth and nutrition when cultivated in sandy soil, which contained natural microbial consortia and 10% (w/w) biochar. Plants treated with viable or autoclaved cells of C. zeae CAB 1119, were subsequently cultivated in soil only or soil amended with biochar. After one month, plants were harvested and growth was measured with regards to dry weight, root RGR and shoot RGR. In addition, the concentrations of P, K, Zn and Fe were analyzed for these plants, where after the growth efficiencies and uptake rates were calculated for these four nutrients. Results indicated that plants growing in soil amended with biochar, and treated with viable C. zeae CAB 1119, showed the best growth. The increased root and shoot RGR witnessed in these plants was probably due to increased concentrations of P and K in the plants. This study opens new avenues of research with regards to the bio-fertilizers of wheat.
AFRIKAANSE OPSOMMING: Die uiteindelike doel van die studie was om die effek van verskillende plantgroei bevorderende metodes op die groei van Triticum aestivum L. (koring) te ondersoek. Dus het ons die vermoë van houtskool en ‘n graan-geassosieerde grondgis getoets om die groei van dié plant te bevorder. Die eerste doel van die studie was om die effek van houtskool toedienings tot sanderige grond te evalueer. Dit is bewerkstellig deur 0%, 1%, 2.5%, 5% en 10% (w/w) van die houtskool by die sand toe te voeg en koring in die houtskool-sand mengsels te kweek. Na die verlangde groei tydperk is die koring geoes en die mikorrizale kolonisasie op en in die koring wortels bepaal. Gedurende hierdie studie is die effek van bogenoemde toedienings op die fisiologie van die plante ondersoek deur die konsentrasies, opname tempo’s, en groei ekonomie van die plante vir stikstof (N), fosfaat (P) en kalium (K) te bepaal. Ons het gevind dat die groei van koring deur die toediening van houtskool bevorder is en dit blyk dat dié effek weens die teenwoordigheid van hoë K vlakke in die plantweefsel is. Die tweede doel van ons studie was om ‘n gis vanuit die risosfeer van ‘n monokotiel wat aan die familie Poacea behoort, naamlik Themeda triandra Forssk. (rooigras) te isoleer. Die vermoë van die isolaat om die groei van koring te bevorder was daarna getoets. Drie verskillende Cryptococcus spesies was vanuit die risosfeer van rooigras geïsoleer, nl. Cryptococcus zeae, Cryptococcus luteolus en Cryptococcus rajasthanensis. Omdat C. zeae in ‘n vorige studie vanaf mielies geisoleer was, is ‘n isolaat van hierdie spesie gebruik in verdere eksperimente. Met die doel om te bepaal of dié gisspesie koringgroei kan bevorder, was die effek van C. zeae op die ontkieming van koring bestudeer en vergelyk met dié van twee ander grond giste, nl. Cryptococcus podzolicus CAB 978 en Rhodotorula mucilaginosa CAB 826. Hierdie drie giste is ook ondersoek om die groei van koring in ‘n glashuis te bevorder. Na een en twee maande se groei was die getalle van giste teenwoordig in die risosfeer en grond verder weg van die wortels bepaal. Die effek van dié giste op die groei van koring is bepaal in terme van droë gewig asook die relatiewe wortel en halm groei tempos. Veranderinge in die nutrient status van koring is ondersoek deur die konsentrasies, groei-ekonomie en tempo van opname vir P, K, sink (Zn) en yster (Fe) te bepaal. Ons het gedurende dié studie gevind dat C. zeae CAB 1119 en C. podzolicus CAB 978 die ontkieming van koring kon verbeter. Ons het ook gevind dat C. zeae CAB 1119 die groei van koring gedurende die eerste en tweede maand van groei kon bevorder, terwyl C. podzolicus CAB 978 dit net gedurende die eerste maand kon vermag en R. mucilaginosa CAB 826 geen effek gehad het nie. Die verbeterde groei kon aan C. zeae CAB 1119, wat die P, K, Zn en Fe groei effektiwiteit van die plante verbeter het, toegeskryf word. Die verbetering van groei effektiwiteit het ‘n positiewe invloed op die relatiewe groeisnelheid van die wortels en halms gehad, en dus op koringgroei. Die laaste doel van die studie was om te bepaal of C. zeae CAB 1119 die groei van koring kon bevorder wanneer die koring in sand wat natuurlike mikrobiese populasies bevat en met houtskool aangevul is, gekweek word. Plante is met lewensvatbare of nielewensvatbare selle van C. zeae CAB 1119 behandel en gekweek in sanderige grond, en/of grond waarby 10% (w/w) houtskool toegevoeg is. Die plante is na een maand geoes en die groei bepaal in terme van droë massa en die relatiewe wortel en halm groei tempos. Die konsentrasies van P, K, Zn en Fe in die plante, asook die fisiologie van die plante, nl. groei ekonomie en tempo van opname, met betrekking tot P, K, Zn en Fe is bepaal, Ons het gevind dat plante wat in die houtskool-grond mengsel gekweek is en met lewensvatbare selle van C. zeae CAB 1119 behandel is die beste groei getoon het. Die verbeterde relatiewe groei tempos van die wortels en halms was mees waarskynlik die gevolg van verhoogde P en K konsentrasies in die plante. Hierdie studie toon nuwe resultate in verband met die gebruik van biologiese alternatiewes tot kunsmis.
21
George, Julie. "Studies on the relationships between physical and chemical parameters of wheat and their relevance to nutritive value". Thesis, Queen's University Belfast, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326391.
Testo completo
22
Lotfollahi, Mohammad. "The effect of subsoil mineral nitrogen on grain protein concentration of wheat". Title page, table of contents and summary only, 1996. http://web4.library.adelaide.edu.au/theses/09PH/09phl882.pdf.
Testo completoAbstract (sommario):
Copy of author's previously published work inserted. Bibliography: leaves 147-189. This project examines the uptake of mineral N from the subsoil after anthesis and its effect on grain protein concentration (GPC) of wheat. The overall objective is to examine the importance of subsoil mineral N and to investigate the ability of wheat to take up N from the subsoil late in the season under different conditions of N supply and soil water availability. Greenhouse experiments investigate the importance of subsoil mineral N availability on GPC of wheat and the factors that contribute to the effective utilisation of N. The recovery of N from subsoil, the effect of split N application on GPC and short term N uptake by the wheat at different rooting densities are also studied.
23
Johansson, Madelene. "Analytical and nutritional aspects of folate in cereals /". Uppsala : Dept. of Food Science, Swedish University of Agricultural Sciences, 2005. http://epsilon.slu.se/200507.pdf.
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Mistele, Bodo. "Tractor based spectral reflectance measurements using an oligo view optic to detect biomass, nitrogen content and nitrogen uptake of wheat and maize and the nitrogen nutrition index of wheat". [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=980399661.
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25
Lopez, de Romaña Daniel Vicente. "Development of iron- and zinc- (doubly-) fortified wheat products to improve the diets, nutrition, and health of Peruvian children /". For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2004. http://uclibs.org/PID/11984.
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26
Turner, Sarah Snow. "Correlation of SPME-GC-MS Volatile Compounds with Descriptive Sensory Odor Analysis of Whole Wheat and Quinoa Flours in Accelerated Storage". BYU ScholarsArchive, 2017. https://scholarsarchive.byu.edu/etd/6821.
Testo completoAbstract (sommario):
The acceptability of whole grain flours during storage varies widely, as does the estimated shelf life of such flours, in part because acceptability is typically determined using subjective human sensory testing. Research is needed to establish more objective measures of acceptability. This study correlated the quantitative results of a descriptive odor sensory panel with volatile compounds determined by solid-phase microextraction-gas chromatograph-mass spectrometry (SPME-GC-MS). Whole wheat flour and quinoa flour were held at 40°C for up to 24 weeks to accelerate changes occurring during storage. Samples were collected every 4 weeks and placed in frozen storage. Thawed samples were then evaluated using SPME-GC-MS and descriptive sensory odor analysis. Significant correlations were found between 1-hexanol, 2-pentylfuran, phenol, hexanoic acid, and hexanal volatiles of whole wheat flour and the odor descriptor cardboard/stale. This indicates that SPME-GC-MS can be used as a less expensive, less time-consuming, more precise method to determine the acceptability of whole wheat flour during storage. Significant correlations were not present in the quinoa flour data, suggesting that SPME-GC-MS may not be preferable to human sensory odor analysis in determining acceptability of stored quinoa flour.
27
Akhter, Naheed [Verfasser]. "Comparison of DRIS and critical level approach for evaluating nutrition status of wheat in District Hyderabad, Pakistan / Naheed Akhter. Landwirtschaftliche Fakultät". Bonn : Universitäts- und Landesbibliothek Bonn, 2012. http://d-nb.info/102062955X/34.
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28
Gustafsson, Kerstin. "Metabolic effects of fibre-rich foods studies of vegetables, oats and wheat on glucose and lipid metabolism and satiety /". Lund : Dept. of Community Health Sciences, and Dept. of Applied Nutrition and Food Chemistry, Chemical Centre, Lund University, 1994. http://catalog.hathitrust.org/api/volumes/oclc/39725793.html.
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29
Goehring, Devin Lynn. "The effects of dietary soybean hulls, wheat, crystalline amino acids and high protein corn dried distiller’s grains on nursery and/or finishing pig growth and carcass characteristics". Thesis, Kansas State University, 2013. http://hdl.handle.net/2097/15878.
Testo completoAbstract (sommario):
Master of ScienceDepartment of Animal Sciences and Industry
Jim Nelssen
Six experiments using 3,659 nursery and finishing pigs were conducted to evaluate the effects of dietary soybean hulls and ingredient processing in corn-soybean meal or corn-soybean meal-DDGS diets on nursery and finishing performance. Experiment 1 tested increasing soybean hulls (0, 5, 10, 15, and 20%) and increasing soybean hulls decreased ADG and G:F. Experiment 2 evaluated increasing soybean hulls (0, 10, and 20%) in diets balanced or not for NE and showed reduced performance with increasing soybean hulls. Balancing for NE resulted in G:F similar to pigs fed the control. Experiments 3 and 4 evaluated increasing dietary soybean hulls in corn-soybean meal and corn-soybean meal-DDGS diets. Soybean hulls in either diet worsened G:F and improved caloric efficiency, suggesting current INRA (2004) values for soybean hulls underestimate their energy value. Experiment 5 evaluated 10 and 20% ground or unground soybean hulls in meal and pelleted diets. Caloric efficiency improved with high levels of soybean hulls. Pelleting improved ADG and eliminated negative effects on G:F with increasing soybean hulls, while grinding soybean hulls reduced performance. Experiment 6 tested increasing ground and unground soybean hulls (0, 7.5, and 15%). Increasing soybean hulls worsened G:F, carcass yield, and hot carcass weight. Grinding soybean hulls to finer particle sizes did not improve ADG and worsened G:F. Experiments 7 and 8 evaluated the replacement of corn with wheat and crystalline amino acids in nursery and finishing pig diets. Replacing 50% of corn with wheat did not affect growth performance in either nursery or finishing; however 100% replacement of corn with wheat reduced performance. In addition, feeding wheat improved carcass fat IV, while use of high levels of crystalline amino acids in wheat-based diets did not influence performance in either study. Experiment 9 evaluated the replacement of soybean meal with high-protein dried distiller’s grains with solubles and crystalline amino acids. High-protein DDGS and crystalline AA can replace 50% of the SBM in finishing diets without negatively affecting performance or carcass yield. Replacing 100% of SBM with high-protein DDGS reduced growth rate, but increasing crystalline AA levels can help mitigate negative effects on carcass yield and fat IV.
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Carmeis, Filho Antonio Carlos de Almeida 1984. "Soil acidity management on an oxisol quality and wheat-common bean growth under a long term no-tillage system /". Botucatu, 2016. http://hdl.handle.net/11449/148617.
Testo completoAbstract (sommario):
Orientador: Carlos Alexandre Costa CrusciolBanca: Dirceu Maximino Fernandes
Banca: Jose Eduardo Corá
Banca: Eduardo Favero Caires
Banca: Adriano Stephan Nascente
Resumo: Os distúrbios químicos e físicos do solo estão entre os principais fatores que restringem o potencial produtivo da agricultura tropical. A baixa capacidade produtiva tem sido associada principalmente à acidez do solo e deficiência de macronutrientes, portanto, é fundamental o desenvolvimento de estratégias que ampliem a capacidade de produção de solos ácidos tropicais. O calcário e o gesso agrícola (PG) são materiais comumente empregados na agricultura para melhorar as propriedades químicas do solo, mas existem poucas informações sobre os efeitos da aplicação superficial desses produtos nas propriedades físicas dos Latossolos e nas diversas frações da matéria orgânica do solo (SOM). Diante destes aspectos, este trabalho objetivou avaliar o efeito da aplicação superficial de calcário e PG sobre os atributos químicos e físicos do solo, crescimento radicular, nutrição de plantas, componentes de produção, características tecnológicas e produtividade de trigo e feijão e sobre as diversas frações de SOM, as quais são consideradas críticas para tornar os sistemas agrícolas tropicais sustentáveis e produtivos. O delineamento experimental foi em blocos casualizados com quatro repetições. Foram estabelecidos quatro tratamentos: controle (sem aplicação de calcário e gesso); PG (2,1 Mg ha-1); calcário (2,0 Mg ha-1); e uma combinação de calcário e PG (2,0 e 2,1 Mg ha-1, respectivamente). Desde a instalação do experimento em 2002, as doses de calcário e PG foram aplicadas três vezes (2002,...
Abstract: Soil chemical and physical disorders are among major limiting factors to improve productive potential of tropical agriculture. The low productive capacity has been associated especially to soil acidity and macronutrient deficient, thus the development of strategies that improve production capacity of tropical acid soils are required. Lime and phosphogypsum (PG) are materials commonly used to improve soil chemical condition, but there is few information about the long-term effects of these products, applied superficially, especially on Oxisol physical properties and organic matter pools. Therefore, this research aimed to evaluate the effect of surface application of lime and PG on the soil chemical and physical attributes, root growth, plant nutrition, yield components, technological characteristics and yield of wheat and common bean, and soil organic matter (SOM) pools considered critical to make agricultural tropical systems sustainable and productive. A randomized complete block design was used and treatments were replicated four times. Four treatments were carried out: control (without lime and gypsum application); PG (2.1 Mg ha-1); lime (2.0 Mg ha-1); and a combination of lime and PG (2.0 and 2.1 Mg ha-1, respectively). Since the experiment was established in 2002, the amendments rates have been applied three times (2002, 2004, and 2010). Superficial liming alleviated Oxisol acidity in the surface and subsurface layers after twelve years under soil acidity management, wit...
Doutor
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Hughes, Darren Michael. "The influence of cultivar, environment and nutrition management onwheat quality in the high rainfall zone of south west, Western Australia". Thesis, Curtin University, 2010. http://hdl.handle.net/20.500.11937/2144.
Testo completoAbstract (sommario):
The high rainfall zone (HRZ) of south west Western Australian (WA) has traditionally been dominated by livestock industries. However, a reduction in wool price throughout the 1990’s has stimulated a transition to farm systems that contain an increasing proportion of annual cropping enterprises. The HRZ, compared to traditional wheat belt areas of WA, has higher rainfall and a longer, cooler growing season. Potential grain yields as determined by seasonal rainfall are not often achieved because of inadequate nutrition and other constraints such as water-logging and disease. Substantial research has been conducted in the HRZ focusing on increasing grain yield to limits set by seasonal rainfall. Research on wheat grain quality characteristics, however, has been limited. The aim of this research was to examine the influence of cultivar, environment and nutrition management on wheat quality characteristics in the HRZ of south west WA and to examine the stability of cultivar performance in relation to site and season.A series of experiments was grown at Moora and Williams in 2005, 2006 and 2007. Sites were chosen to represent contrasting environments within the HRZ. Moora, the more northern site typically has higher temperatures and lower rainfall compared to Williams. Eight cultivars were selected, two that are accepted into each of the commercial quality grades (Australian Prime Hard APH, Australian Hard AH, Australian Premium White APW and Durum). Three levels of nutrition management were applied ‘control’, ‘grower’ and ‘researcher’ and were chosen to simulate low, medium and high fertiliser rates likely to be used by growers in the HRZ. Treatments effects were measured for grain yield, physical grain quality characteristics and grain protein quality charactertics as determined by a mixograph.Environment was responsible for almost 90% of the variation for grain yield, screenings, Hagberg falling number and milling yield. Management of crop nutrition was the principal source of variation for grain protein quantity (48%), dough strength as measured by mixograph area below the curve (52%) and water absorption (46%-52%). It was often the second greatest source of variation for other characteristics measured in this study. Cultivar was the predominant source of variation for dough strength as measured by mixograph initial build-up (46%) and dough stability (47%), but it had only a small affect on grain yield and grain protein quantity (2%).The increase in nutrition resulted in a significant increase in water absorption and dough strength and a trend towards increasing dough stability. An increase in gliadin and glutenin proteins is thought to be responsible for this result. The low nutritional status of soils in the HRZ not only restricts grain yield but grain protein quantity and quality. The impact of nutrition management on grain yield and quality characteristics as shown in these experiments should be considered by breeders, agronomists and marketers when interpreting experimental results. Furthermore, the results indicate that the nutritional management of breeding experiments should be based on a sound methodical approach, incorporating a combination of soil test results, grain yield potential and seasonal monitoring for the environment in question and not be simply based on levels that are either ‘district practice’ or ‘non-limiting’.This study has also identified statistically significant differences between cultivars for stability of grain yield and grain protein quality. Four cultivars (three bread wheat and one durum wheat) were characterised as having dynamic stability, which is described as the ability to respond to an environment in a predictable way. In addition, three cultivars were assessed as having static stability, unchanged performance regardless of any variation in environment for water absorption. This information indicates that assessment of stability of cultivars during the early stages of testing can assist commercial buyers in sourcing suitable grain quality and even that there may be potential to breed cultivars with improved static or dynamic stability.If it is assumed that the Australian wheat industry cannot compete in a global wheat market based on the relatively small level of production. Then the future of the industry lies in producing the qualities required by specific markets. Realizing the impact of nutrition management on quality characteristics in the HRZ of WA will be a positive step towards a sustainable industry.
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Voller, Samuel W. "The impacts of wheat gluten products and short-chain fructooligosaccharides on the health and production of juvenile rainbow trout (Oncorhynchus mykiss)". Thesis, University of Plymouth, 2017. http://hdl.handle.net/10026.1/9826.
Testo completoAbstract (sommario):
Through the implementation of in vivo feeding trials, the efficacy of three wheat gluten (WG) products, vital (Amytex®), hydrolysed (Merripro®) and soluble hydrolysed (Solpro®) wheat gluten as replacement of soy protein concentrate, and scFOS prebiotic (Profeed®) supplementation were analysed to assess their impacts on intestinal health and production of juvenile rainbow trout. Microbial community analysis in experiment one revealed a degree of diet based modulation with 7.5% and 15% inclusions of wheat gluten (WG) products. Bacterial species diversity was significantly reduced with 15% hydrolysed wheat gluten (HWG) inclusion compared to the plant protein control and 15% vital wheat gluten (VWG) treatments, with sequenced OTUs dominated by the phylum Firmicutes and possible promotion of probiotic species. No detrimental effects were observed on intestinal morphology. These findings led onto a longer duration feed trial with a more holistic, higher resolution approach. Experiment two revealed modulation of the allochthonous intestinal microbiota, with increased proportions of Enterococcus and Weissella in the 10% and 20% VWG treatments. Bacillus and Leuconostoc relative abundances were significantly increased with 10% HWG and soluble hydrolysed (Sol) wheat gluten inclusions. HSP 70 transcripts were significantly down-regulated in all WG treatments compared to the basal soy protein concentrate treatment (SPC) and increased intraepithelial leukocyte counts were observed with 10% VWG inclusion. Growth performance was unaffected by 10% dietary inclusions of WG, however, FCR’s were significantly improved in the 20% VWG treatment compared to the 10% HWG and Soluble treatments. This led to the investigation of increased inclusion levels of WG products in experiment three. All WG treatments in experiment three yielded significantly improved growth performance. Somatic indices were significantly increased with 30% blended WG inclusion compared to the SPC treatment. Modulation of allochthonous intestinal microbiota was observed to a lower degree than the previous experiments, with a dose response observed with increasing blended WG inclusion. In the final experiment two basal diets (SPC and 20% Blended) and two scFOS supplemented diets (SPC + FOS and 20% Blended + FOS) were investigated for the effect on growth performance, gut health and allochthonous microbial population. Growth performance was unaffected, however, modulation of the allochthonous microbial population was observed with an apparent synergistic effect of scFOS supplementation in WG diets. This synergistic trend was also observed in the transcription level expression of immune relevant genes. 20% WG inclusion with additional scFOS supplementation observed significant down regulation of the pro-inflammatory cytokine TNF-α, as well as HSP 70, CASP 3 and Glute ST compared to the 20% Blend treatment. The present research demonstrates dietary inclusions of WG products, solely or blended, at the expense of soy protein concentrate to modulate the allochthonous microbial population, potentially promoting probiotic species, whilst reducing the levels of intestinal stress in juvenile rainbow trout. Supplementation of the prebiotic scFOS modulated the microbial populations, enhancing the proportion of potential probiotic species, and combined with WG inclusions, reduce intestinal and oxidative stress and inflammation biomarkers, with no observed deleterious effects.
33
Castro, Calvache Egresado Hever Patricio. "Formulation of Balanced Diets in Base of Grains of Left-over of Corn, Wheat, and Barley for Guinea pigs (Cavia porcellus)". BYU ScholarsArchive, 2002. https://scholarsarchive.byu.edu/etd/5345.
Testo completoAbstract (sommario):
The present investigation was carried out in the rural community La Rinconada, located in the canton Ibarra of the province of Imbabura. The field work was developed during 12 months. Previous activities were developed to the rehearsal like socialization of the program; training in areas of: poscosecha of grains, alfalfa cultivation and systems of growth of guinea pigs. The rehearsal lasted 70 days and it was developed in the property of three families of the community. The formulation of diets balanced based on grains of waste of corn, wheat and barley for the growth and increment of weight of guinea pigs, it was the main objective from the investigation. The rehearsal was carried out with 84 weaned male guinea pigs of the improved Creole type, acquired in a farm of guinea pigs, of the province of the Carchi. It was used, experimental design of complete blocks at random (DBCA) with a factorial arrangement A x B + 1 and three repetitions. The factor A it was conformed by three formulations of balanced. The balanced 1 (B1) had as protein source the soy cake, the balanced 2 (B2) had as protein source the bean and the balanced 3 (B3) had as protein source the pea. The factor B it was conformed by two forage types : alfalfa (Medicago sativa L.), forage 1 (F1) and the mixture forager pastures and boil of the community forage (F2). The witness treatment T7, was the traditional feeding of guinea pigs, in the community. Was used: kitchen waste, crop waste and boil and pastures of the community. The treatments were seven : T1 (Balanced 1 + alfalfa), T2 (Balanced 1 + pastures and boil of the community), T3 (Balanced 2 + alfalfa), T4 (Balanced 2 + pastures and boil of the community), T5 (Balanced 3 + alfalfa), T6 (Balanced 3 + pastures and boil of the community) and T7 witness treatment (traditional feeding). The evaluated variables were consumption of dry matter, increase of biweekly weight, nutritious conversion, mortality and production costs. The experimental unit was conformed by four weaned male guinea pigs. Of the obtained results it concludes that the Balanced 1 and Balanced 3 were the best. The mixture foragers, pastures and boil of the community presented superior results to those of the alfalfa . The treatment witness (traditional feeding of the community) it is not advisable, the guinea pigs didn't reach characteristic of weight and commercialization or for reproduction. For the results of increment of weight, nutritious conversion, production costs and access to the matters cousins, are recommended to use the diet of the treatment T6 (Balanced 3 + pastures and boil of the community) in the feeding of guinea pigs, in the rural sector of the Andean region of the Ecuador.
34
Swindler, Jonathan Myers. "Effect of Enrichment-Bleaching and Low Oxygen Atmosphere Storage on All-Purpose Wheat Flour Quality". BYU ScholarsArchive, 2013. https://scholarsarchive.byu.edu/etd/4064.
Testo completoAbstract (sommario):
All-purpose wheat flour is a useful long-term storage commodity, but is subject to off-odor formation. Although flour stored in a low oxygen atmosphere should inhibit rancid odor formation, it elicits consumer complaints about odor. The purpose of this study was to examine off-odor development in all-purpose wheat flour during ambient and elevated storage by determining the effect of low oxygen atmosphere and enrichment-bleaching on quality as measured by, free fatty acids (FFA), flour descriptive sensory analysis, conjugated dienes, headspace volatiles, bread consumer sensory analysis, color, loaf volume, and vitamin analysis. Enriched, bleached (EB) and unenriched, unbleached (UU) flour was stored in a low and normal oxygen atmosphere in no. 10 cans at 22, 30, and 40°C for 24 weeks. Moisture remained constant throughout the study. Headspace oxygen was < 0.1% in flour stored in a low oxygen atmosphere and decreased in flour stored in a normal oxygen atmosphere. FFA increased with storage time and temperature. The "fresh flour" descriptive aroma of flour decreased during storage and decreased more rapidly in a low oxygen atmosphere. The "cardboard/stale" aroma increased in flour stored in a normal oxygen atmosphere. The "acid-metallic" aroma increased in flour stored in a low oxygen atmosphere and was determined to be the off-odor from consumer complaints. Conjugated dienes and volatiles generally increased more rapidly in flour stored in a normal oxygen atmosphere and in EB flour, suggesting that the acid-metallic odor did not result from lipid oxidation. Bread consumer sensory analysis identified EB flour stored in a normal oxygen atmosphere to have the lowest acceptance scores for aroma, overall acceptability, and flavor. The acid-metallic odor dissipated within 24 hours when the container was opened and was not detrimental to consumer acceptance of bread made from the flour. Oxygen absorbers prevented the darkening of flour but not the reddening or yellowing. A low oxygen atmosphere resulted in higher bread loaf volumes. Vitamin degradation is not a concern under normal storage conditions. Bleaching appears to increase flour oxidative rancidity more than enrichment. Although storage at a low oxygen atmosphere results in an off-odor present in newly opened cans, it gave higher quality flour and bread. A low oxygen atmosphere should continue to be used in flour stored long-term, and consumers should be made aware that the off-odor present in cans of flour dissipates after opening.
35
Singbo, Arnaud. "The effect of zinc and soil ph on grain yield and nutrient concentrations in spring wheat cultivated on potted soil". Thesis, Cape Peninsula University of Technology, 2018. http://hdl.handle.net/20.500.11838/2845.
Testo completoAbstract (sommario):
Thesis (MTech (Agriculture))--Cape Peninsula University of Technology, 2018.Zinc deficiency on various soil types have been reported in arable soils of sub Saharan Africa (SSA) including South Africa. A pot trial was conducted at the Cape Peninsula University of Technology, Wellington campus to investigate the interaction of different application rates of Zn at various soil pH on the grain yield and quality of spring wheat in a completely randomized factorial design replicated three times. The four soil pH tested were: pHA: 5.1, pHB: 5.6, pHC: 6.1, pHD: 6.6 which correspond to lime application at 0, 0.5, 1 and 1.5 t/ha. Five Zn rates (Zn1: 3.5; Zn2: 4.5; Zn3: 5.5 Zn4: 6.5, and Zn5: 7.5 mg /kg soil which correspond to Zn1: 7; Zn2: 9; Zn3: 11; Zn4: 13 and Zn5: 15 kg /ha) were applied at two (planting and flowering) growth stages. Yield and yield component data collected were analyzed using SAS version 9.2 and means were separated by Duncun’s Multiple Range Test (DMRT). The results showed that grain yield and yield components were significantly affected by lime application pHC (6.1): 1t/ha at planting. Zn application at planting had no significant effect on the grain yield and yield components. However, at flowering, the simultaneous increase of Zn along with increase in lime positively affected grain yield and yield components. Plant analysis showed that at both stages (planting and flowering), Zn application, especially at pH 6.6, significantly increased P, K, Ca, Na, Mg Fe, Cu and B concentrations in wheat grain, but the concentrations of N, Mn, Zn and protein remained unaffected. Zn application had no effect on most nutrients due to the presence of lime. While the absence of lime, Zn4: 6.5mg/kg (corresponding to 13kg/ha) significantly increased the nutrients. In addition, Zn3: 5.5mg/kg (corresponding to 11kg/ha) promoted Zn absorption by grain in all treatments.
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Scott, Victoria Elizabeth. "Stability of Whole Wheat Flour, Rolled Oats, and Brown Rice During Long-Term Storage and Preparation". BYU ScholarsArchive, 2015. https://scholarsarchive.byu.edu/etd/6169.
Testo completoAbstract (sommario):
Whole grains are an increasingly popular health food in America. However, shelf life of whole grains is compromised due to the presence of lipoxygenases in the bran and germ, which lead to rancidity and generation of oxidative byproducts. These byproducts reduce sensory quality and may have a degradative effect on vitamins in whole grain products. The purpose of this study was to determine the degree of lipid and vitamin degradation during long-term storage of three whole grains: whole wheat flour, brown rice, and rolled oats. We also examined vitamin loss after cooking to determine if oxidative byproducts had an effect on vitamins during typical household cooking. Whole wheat flour, brown rice, and rolled oats were stored for 12 months and periodically analyzed for conjugated dienes, free fatty acids, tocopherols, thiamin, and riboflavin. Whole wheat bread, steamed brown rice, and oat porridge were made from samples stored for 0 months and 12 months and were analyzed for thiamin and riboflavin. Conjugated dienes increased significantly only in rolled oats, while tocopherols decreased significantly in whole wheat flour and rolled oats and insignificantly in brown rice. Free fatty acids increased significantly in whole wheat flour and brown rice. Thiamin and riboflavin were stable in raw stored grains and cooked products made from stored grains with the exception of brown rice, in which we observed a significant decrease in thiamin after 12-month storage and cooking. These results suggest whole wheat flour, brown rice, and rolled oats experience significant lipid and tocopherol degradation, but it does not appear to affect thiamin and riboflavin in raw stored products. Cooking appears to cause degradation of thiamin after storage of brown rice, but thiamin and riboflavin were otherwise stable in these whole grains.
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Daraja, Yusuf B. "The effects of intercropping, nitrogen and sulphur nutrition on the performance of wheat (Triticum aestivum) and Faba Bean (Vicia faba) in different production systems". Thesis, University of Reading, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.515808.
Testo completo
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Swiegers, Johannes Pieter. "The effect of oat silage replacement with wheat straw in dairy cow diets on animal performance, rumen fermentation and adequacy of CPM dairy model predictions". Thesis, Stellenbosch : Stellenbosch University, 2011. http://hdl.handle.net/10019.1/18096.
Testo completoAbstract (sommario):
Thesis (PhDAgric (Animal Sciences))--Stellenbosch University, 2011.ENGLISH ABSTRACT: A series of experiments were conducted to determine the effect of the replacement of oat silage by wheat straw in low forage diets for high producing dairy cows. In the first trial, 28 multiparous Holsteins were randomly assigned to two dietary treatments, namely silage and straw after completing a covariate period coinciding with the first 40 days of lactation and remained on these diets for the remainder of experimental period from 41 to 252 days. In order to evaluate the effect of substitution during different stages of lactation, the experimental period was divided into four phases. Diets were formulated to support similar levels of milk for both treatment groups and for all phases. The substitution of oat silage by wheat straw had a negative effect on dry matter intake, milk production and composition, as well as on feed and nitrogen efficiency, but had no effect on body weight and body condition. A rumen fermentation trial was also done, where six multiparous cannulated cows were randomly allocated in a changeover design to the same dietary treatments used in the animal performance trial. Despite a relatively low peNDF content and high NFC content of the diets, the mean rumen pH and time spent below pH 5.8 indicated that cows were actually not subjected to subclinical rumen acidosis, probably due to effective chewing activity. Forage source had no significant effect on rumen fermentation end products or mean daily rumen pH. However, the time spent below pH 5.8 was significantly lower for cows in the silage treatment than for those in the straw treatment, which could be related to a longer chewing time and more effective chewing activity that was observed on the straw treatment. Cows on the straw treatment sorted less against the medium sized particles, which was not expected, since straw inclusion is normally associated with a higher degree of sorting. In a third experiment, the effect of the replacement of silage by wheat straw was evaluated in terms of pre and postpartum animal performance. Dry cow diets were formulated with the objective to restrict intake, thus preventing cows from consuming metabolizable energy in excess of their requirements. Both treatments were successful in controlling intake and the replacement of oat silage by wheat straw in dry cow diets had no apprent effect on postpartum animal performance. Using the data from the lactation experiment, the adequacy of the CPM Dairy model to predict animal performance from low forage diets was also evaluated. The model was highly accurate in predicting adjusted milk production of cows consuming oat silage as basal forage, with a mean bias of only 0.05 kg milk/d, but it overpredicted milk production of cows receiving diets with wheat straw as the sole forage source, with a mean bias overprediction of 2.3 kg milk per day during the corresponding period of positive energy balance. Overprediction of energy balance from straw was confirmed in the dry cow experiment where a statistical analysis of the residuals between predicted and actual body condition score change indicated an overprediction on the straw treatment.
AFRIKAANSE OPSOMMING: Die invloed van die vervanging van hawerkuilvoer deur koringstrooi in diëte vir hoogproduserende melkkoeie is in ‘n reeks proewe nagegaan. In die eerste proef is 28 volwasse Holsteinkoeie ewekansig aan ‘n kuilvoer- of strooigebaseerde behandeling toegeken na die voltooiing van ‘n kovariaatperiode van 40 dae. Ten einde die invloed van die behandeling tydens verskillende stadia van laktasie te evalueer, is die proefperiode in vier fases verdeel. Diëte is geformuleer om vergelykbare melkproduksies vir beide behandelings tydens al die fases te ondersteun. Vervanging van hawerkuilvoer deur koringstrooi het ‘n negatiewe invloed op droëmateriaalinname, melkproduksie, melksamestelling, voeromset en stikstofbenutting gehad, maar geen invloed op ligaamsmassa- en kondisieverandering nie. In ‘n rumenfermentasieproef is ses volwasse, gekannuleerde Holsteinkoeie in ‘n omswaai-ontwerp aan twee diëte, soortgelyk aan dié wat tydens die laktasieproef gebruik is, in toegewys. Ten spyte van ‘n relatief lae peNDF-inhoud en ‘n relatief hoë NFC-inhoud van die diëte was daar, te oordeel aan die gemiddelde rumen pH en tyd waartydens die rumen pH onder 5.8 was, geen aanduiding van subkliniese rumenasidose nie, waarskynlik as gevolg van ‘n langer kou-tyd en meer doeltreffende kouaktiwiteit. Ruvoerbron het skynbaar ook geen invloed op rumenfermentasie-eindprodukte en gemiddelde rumen pH gehad nie. Die periode waartydens rumen pH laer as 5.8 was, was egter korter vir koeie in die kuilvoerbehandeling as vir dié in die strooibehandeling. Dit kan waarskynlik aan meer doeltreffende herkou-aktiwiteit toegeskryf word. Aangesien strooiinsluiting in herkouerdiëte normaalweg met ‘n groter mate van voerseleksie geassosieer word, was die kleiner mate van seleksie teen mediumgrootte partikels met die strooibehandeling verrassend. In ‘n derde proef is die invloed van van die vervanging van kuilvoer met koringstrooi in terme van pre- en postpartum diereprestasie ondersoek. Droëkoeidiëte is geformuleer met die doel om inname te beperk en koeie sodoende te verhoed om meer metaboliseerbare energie in te neem as wat hulle benodig. Albei behandelings was doeltreffend om inname te beheer en die vervanging van hawerkuilvoer met koringstrooi het geen invloed op postpartum diereprestasie gehad nie. Deur van die data van die laktasieproef gebruik te maak, is die toereikendheid van die CPM Dairy model om diereprestasie vanaf lae ruvoerdiëte te voorspel, ook bepaal. Die model was hoogs akkuraat in die voorspelling van melkproduksie in die geval van die kuilvoerbehandeling, maar dit het melkroduksie met 2.3 kg/dag oorskat in die geval van die koringstrooibehandeling. Hierdie oorberaming van energiebalans is tydens die droëkoeiproef bevestig.
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Calle, Ayma Eddy Wilfredo. "Effect of canihua (Chenopodium pallidicaule Aellen), wheat (Triticum aestivum L.), and soybean (Glycine max M) sprouts on the feeding of guinea pigs for growth". BYU ScholarsArchive, 2004. https://scholarsarchive.byu.edu/etd/5340.
Testo completoAbstract (sommario):
This study occurred during July, August, and September in the Small Animals Investigation and Production Center (CIPAM), dependent of the Faculty of Agricultural, Livestock, and Veterinary Sciences of the Technical University of Oruro, of the Central Highland of Bolivia. In order to satisfy guinea pig nutrition requirements, which are 2800.00 kcal/kg of energy, 18.00% protein, 10.00% fiber, 1.00% calcium, and 0.60% phosphorus, the following ingredients were used in feed: 11.30% yellow corn, 30.00% milled wheat [Bromus catharticus], 14.00% soy cake, 32.00% wheat bran, 9.00% alfalfa flour, 1.80% bone flour, 1.00% conchilla, 0.50% common salt, and 0.40% methionine. The effect that vitamin C deficiency causes is scurvy, with 100% mortality of guinea pigs at 28 days without green forage. This investigation was made with supplementation of canahua, wheat, and soybean sprouts in the growth stage with the object of replacing green forage in winter by presenting vitamin C. Canihua sprouts at 8 days gave a maximum of 6.28mg of vitamin C /100g of sample, and wheat sprouts at 8 days gave a maximum of 16.09mg of vitamin C/100g of sample. Soybean sprouts at 13 days reached 21.41mg of vitamin C /100g of sample, which continued to increase, but one should be warned that maintaining sprouts of this species is expensive. Rations consisted of 90.00g of sprouts plus 72.00g of feed per guinea pig, with the oral administration of 12.98mg of vitamin C in water solution per guinea pig used in the area. The reason is the improvement in guinea pig meat production with high protein content (20.30%), compared to cattle (17.50%) and sheep (14.50%), and the lower cholesterol of guinea pig (7.80%) compared to cattle (21.80%) and sheep (37.80%), and at a lower cost, with organic sprouts of high nutritional value. The canahua-soybean sprout treatment with 45% dry matter, 5.73% ash, 7.03% ether extract, 25.50% protein, 6.85% raw fiber, and 51.58% free nitrogen extract at 64 days of winter growth showed a live weight gain of 437.73g in relation to pure feed of 66.05% dry matter, 7.33% ash, 2.83% ether abstract, 19.51% raw protein, 7.52% raw fiber, and 56.46% free nitrogen extract with 359.23g. The difference is 78.50g, which is significant at 0.05 with a t-test. The result indicates that the canahua-soybean interaction is the best for live weight gain at 64 days of growth with respect to normal feed, for which the null hypothesis is rejected and the alternative hypothesis accepted. The live weight gain by sex in guinea pigs at 48 and 64 days of growth was highly significant, in females from 206.67g (4.3g/day) to 303.29g (4.74g/day) and in males from 262.27g (5.46g/day) to 392.27g (6.13g/day), with differences between males and females of 55.6 and 89g. These results show that male guinea pigs generally gain more weight than females during growth, which could be commercialized in the opportune moment. The food conversion between sexes fed with the different sprouts at 64 days of growth was 9.55 in females and 7.62 in males, a difference of 1.90. Also, the sex-soybean interaction in females with soybean was 10.31 and in males with soybean 6.79, a difference of 3.52, which is significant at 0.01. Similarly, the food conversion at 64 days of treatment by canahua sprouts and a feed with 41.34% dry matter, 5.69% ash, 3.47% ether extract, 20.58% raw protein, 8.04% raw fiber, and 56.25% free nitrogen extract is 7.90. In relation to just the feed it is 9.20, with a difference of 1.30. In a t-test this is significant at 0.05. These results show that male guinea pigs eat less food and grow more than females under the same conditions. The lowest production cost was obtained with canahua-feed interaction, in females Bs4.0/guinea pig (US$0.501) and in males Bs3.9/guinea pig (US$0.488). Canahua-soybean interaction yielded Bs5.50/guinea pig (US$0.689) for females and Bs5.50/guinea pig (US$0.689) for males. Normal feed yielded Bs4.20/guinea pig (US$0.526) for females and Bs5.40/guinea pig (US$0.676) for males. (US$1 = Bs7.98). Also, there was a percentage variation for the canahua-soybean-feed interaction in females of 5.00% lower than just feed and in males 27.80% lower than just feed. These results show that it is best to use canahua sprouts plus feed because this gives the lowest costs of feeding growing guinea pigs in winter.
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Viana, Eloise Mello. "Interação de nitrogênio e potássio na nutrição, no teor de clorofila e na atividade da redutase do nitrato de plantas de trigo". Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/11/11140/tde-31072007-094902/.
Testo completoAbstract (sommario):
O conhecimento do comportamento vegetal quanto ao uso de nutrientes permite manusear ou modificar o sistema de cultivo para melhorar a eficiência na utilização de nitrogênio. O fornecimento de potássio para as plantas estimula o aproveitamento do nitrogênio, possibilitando que sua absorção, assimilação e, conseqüentemente, a produtividade sejam aumentadas. Com base nestes fatos, o objetivo deste estudo foi avaliar o efeito de combinações de doses de nitrogênio e de potássio na nutrição, no teor de clorofila e na atividade da enzima redutase do nitrato em plantas de trigo (Triticum aestivum L.). O experimento foi conduzido em casa de vegetação do Departamento de Ciência do Solo da ESALQ/USP, localizada no município de Piracicaba-SP, utilizando-se vasos de três litros onde foram acondicionadas amostras da camada 0-20 cm de um Argissolo Vermelho Amarelo Abrúptico. Utilizou-se esquema fatorial 52 fracionado, com combinações de cinco doses de nitrogênio (0; 70; 140; 210 e 280 mg dm -3) e de cinco doses de potássio (0; 50; 100; 150 e 200 mg dm-3), as quais foram distribuídas segundo delineamento experimental de blocos aleatorizados, com quatro repetições. As leituras SPAD das folhas do terço-médio das plantas de trigo foram realizadas 30 dias após a semeadura. Aos setenta e nove dias após a semeadura foi realizada determinação da atividade da enzima redutase do nitrato. Aos 80 dias após a semeadura, as plantas foram colhidas, separada em parte aérea, espiga e raízes, secadas, pesadas e submetidas à determinação da concentração de nutrientes e acúmulo de nitrogênio e potássio. Os resultados foram analisados por meio do programa estatístico SAS e mostraram que o equilíbrio entre o fornecimento de nitrogênio e potássio foi essencial para o crescimento adequado das plantas de trigo. Ficou evidente que a combinação entre as doses de nitrogênio e de potássio interagiu positivamente na produção de fitomassa e na concentração de nitrogênio, fósforo, potássio, cálcio e enxofre na parte aérea das plantas; o nitrogênio foi determinante para a concentração de magnésio no tecido vegetal. A interação entre as doses de nitrogênio e de potássio influenciou positivamente na produção de fitomassa e na concentração de nitrogênio na espiga. A concentração de potássio na espiga dependeu apenas do fornecimento das doses de nitrogênio. A produção de fitomassa das raízes foi incrementada com o fornecimento das doses de nitrogênio e de potássio, sendo suas concentrações de nitrogênio, magnésio e de enxofre influenciadas pelo suprimento de nitrogênio. A concentração de potássio nas raízes diminuiu e a de cálcio aumentou com as doses de nitrogênio, conforme equação de segundo grau. O fornecimento de potássio promoveu decréscimos lineares na concentração de magnésio na parte aérea e nas raízes das plantas de trigo. O nitrogênio aumentou a atividade da redutase do nitrato até as doses intermediárias, diminuindo nas doses elevadas. O teor de clorofila das folhas do terço-médio da planta foi influenciado pela interação entre as doses de nitrogênio e potássio e refletiu diretamente na produtividade de fitomassa da parte aérea e de espigas, assim como no acúmulo de nitrogênio pelas plantas de trigo.The knowledge about plant nutrition allows managing crop systems in order to improve the nitrogen use efficiency. Supplying potassium to plants stimulates the efficiency use of nitrogen through plant uptake and assimilation, consequently increasing crop yields. Based on these facts, the aim of this study was to evaluate the effect of combined rates of nitrogen and potassium on the nutrition, chlorophyll content, and nitrate reductase activity in wheat (Triticum aestivumaestivum L.) plants. The experiment was conducted in a greenhouse of the Soil Science Department of the ESALQ/USP in Piracicaba State of São Paulo, Brazil. Three-liter pots were filled with 0-20 cm depth samples of Arenic Hapludult. A fractionated 52 factorial was used, with combinations of five nitrogen rates (0; 70; 140; 210 e 280 mg dm-3) and five potassium rates (0; 50; 100; 150 e 200 mg dm-3), which were set in a randomized block design with four replications. Thirty days after seeding SPAD values readings were taken on the leaves. Nitrate reductase activity was determined seventy-nine days after seeding and one day later plants were harvested and separated in shoot, roots, and ears. These plant materials were weighted and submitted to nutrient content and accumulation of nitrogen and potassium. Statistical analyses were performed by means of SAS software. Results presented that the balance between nitrogen and potassium supplies was essential to adequate wheat plant growth. It was clear that the combination of nitrogen and potassium rates had a positive influence on wheat dry mass yield as well as on nitrogen, phosphorus, potassium, calcium, and sulphur contents in plant shoot. Nitrogen was essential to maintain adequate magnesium content in plant tissues. The interaction between nitrogen and potassium rates was important for plant yield and ear nitrogen content. Potassium content in the ears was affected only by nitrogen rates. Root dry matter yield increased with rates of nitrogen and potassium. Nitrogen, magnesium and sulphur contents in the roots were influenced only by nitrogen application. Potassium concentration in the roots reduced and calcium concentration increased with nitrogen rates according to a quadratic equation. Potassium supply caused linear decreases in magnesium content of shoots and roots. Nitrogen increased nitrate reductase activity up to the medium rates of application and reduced for the highest rates. Chlorophyll content in the leaves was influenced by the interaction between nitrogen and potassium rates, reflecting on the dry matter yield of plant shoot and ears, as well as on nitrogen accumulation in the wheat plants.
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Quant, Anthony David. "Standardized ileal digestible tryptophan to lysine ratios in growing pigs fed U.S.-type and non-U.S.-type feedstuffs". Lexington, Ky. : [University of Kentucky Libraries], 2008. http://hdl.handle.net/10225/973.
Testo completoAbstract (sommario):
Thesis (M.S.)--University of Kentucky, 2008.Title from document title page (viewed on February 2, 2009). Document formatted into pages; contains: ix, 146 p. : ill. (some col.). Includes abstract and vita. Includes bibliographical references (p. 138-145).
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Bonnot, Titouan. "Réponse du grain de blé à la nutrition azotée et soufrée : étude intégrative des mécanismes moléculaires mis en jeu au cours du développement du grain par des analyses -omiques". Thesis, Clermont-Ferrand 2, 2016. http://www.theses.fr/2016CLF22767/document.
Testo completoAbstract (sommario):
L’augmentation des rendements est un enjeu majeur chez les céréales. Dans cet objectif, il est nécessaire de maintenir la qualité du grain de blé, qui est principalement déterminée par sa teneur et sa composition en protéines de réserve. En effet, une forte relation négative existe entre le rendement et la teneur en protéines. Par ailleurs, la qualité du grain est fortement influencée par la disponibilité en azote et en soufre dans le sol. La limitation des apports d’intrants azotés à la culture et la carence en soufre récemment observée dans les sols représentent ainsi des difficultés supplémentaires pour maitriser cette qualité. Une meilleure connaissance des mécanismes moléculaires impliqués dans le contrôle du développement du grain et la mise en place de ses réserves protéiques en réponse à la nutrition azotée et soufrée est donc primordiale. L’objectif de cette thèse a ainsi été d’apporter de nouveaux éléments à la compréhension de ces processus de régulation, aujourd’hui peu connus. Pour cela, les approches -omiques sont apparues comme une stratégie de choix pour identifier les acteurs moléculaires mis en jeu. Le protéome nucléaire a été une cible importante dans les travaux menés. L’étude de ces protéines nucléaires a révélé certains régulateurs transcriptionnels qui pourraient être impliqués dans le contrôle de la mise en place des réserves du grain. Dans une approche combinant des données de protéomique, transcriptomique et métabolomique, une vision intégrative de la réponse du grain à la nutrition azotée et soufrée a été obtenue. L’importance d’un apport de soufre dans le contrôle de la balance azote/soufre du grain, déterminante pour la composition du grain en protéines de réserve, a été clairement vérifiée. Parmi les changements observés au niveau du métabolisme cellulaire, certains des gènes affectés par la modification de cette balance pourraient orchestrer l’ajustement de la composition du grain face à des situations de carences nutritionnelles. Ces nouvelles connaissances devraient permettre de mieux maitriser la qualité du grain de blé dans un contexte d’agriculture durableImproving the yield potential of cereals represents a major challenge. In this context, wheat grain quality has to be maintained. Indeed, grain quality is mainly determined by the content and the composition of storage proteins, but there is a strongly negative correlation between yield and grain protein concentration. In addition, grain quality is strongly influenced by the availability of nitrogen and sulfur in soils. Nowadays, the limitation of nitrogen inputs, and also the sulfur deficiency recently observed in soils represent major difficulties to control the quality. Therefore, understanding of molecular mechanisms controlling grain development and accumulation of storage proteins in response to nitrogen and sulfur supply is a major issue. The objective of this thesis was to create knowledge on the comprehension of these regulatory mechanisms. For this purpose, the best strategy to identify molecular actors involved in these processes consisted of -omics approaches. In our studies, the nuclear proteome was an important target. Among these proteins, we revealed some transcriptional regulators likely to be involved in the control of the accumulation of grain storage compounds. Using an approach combining proteomic, transcriptomic and metabolomic data, the characterization of the integrative grain response to the nitrogen and sulfur supply was obtained. Besides, our studies clearly confirmed the major influence of sulfur in the control of the nitrogen/sulfur balance that determines the grain storage protein composition. Among the changes observed in the cell metabolism, some genes were disturbed by the modification of this balance. Thus these genes could coordinate the adjustment of grain composition in response to nutritional deficiencies. These new results contribute in facing the challenge of maintaining wheat grain quality with sustainable agriculture
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Kihlberg, Iwona. "Sensory Quality and Consumer Perception of Wheat Bread : Towards Sustainable Production and Consumption. Effects of Farming System, Year, Technology, Information and Values". Doctoral thesis, Uppsala University, Department of Domestic Sciences, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4529.
Testo completoAbstract (sommario):
In order to study the effect of production systems aimed at sustainability on product quality and of sensory and non-sensory factors on product acceptance – the effect of farming system, year, milling and baking techniques on the sensory qualities of wheat bread as a model product was investigated using a descriptive test, and the effect of information and values on liking of bread using consumer tests.
Whole wheat and white breads were baked with wheat grown in six lots in established conventional and organic farming systems in field trails, in two subsequent years for the white bread.
Milling technique influenced flours’ rheology and had greater impact on the sensory qualities of whole wheat bread and on the slice area than did farming system and baking technique. Bread baked with roller-milled wheat was characterized by sweetness, juiciness, compactness and smaller slice area than bread baked with stone-milled wheat, which was characterized by saltiness, deformity and roasted cereals.
The effect of year on the white bread was greater than the effect of farming system or recipe modification. Bread baked with wheat harvested in 1999 had significantly lower intensities of crumb attributes such as smoothness, juiciness and elasticity, but higher rancid flavour, springiness, compressibility, mastication resistance than bread baked with wheat harvested in 2000. Bread baked with conventional flour had significantly higher juiciness and elasticity than organic bread.
Image analysis did not show differences in slice area between bread baked with conventionally and organically grown wheat harvested in 1999 compared with 2000. Information affected liking in relation to the type of provided information. Information on organic origin enhanced most liking of bread, particularly for the less liked samples and frequent consumers of organic food. Significantly different values and different specific liking of breads were found among consumer segments. Results linked values and age with “taste”.
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Cooke, Julie A. "Nutritional requirement of wheat in relation to tolerance to Rhizoctonia solani Kühn /". Title page, contents and abstract only, 2000. http://web4.library.adelaide.edu.au/theses/09APSP/09apspc772.pdf.
Testo completo
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Adamidou, Styliani. "Effect of extrusion on the nutritional value of peas (Pisum sativum), chickpeas (Cicer arietinum) and faba beans (Vicia faba) and inclusion in feeds for European seabass (Dicentrarchus labrax) and gilthead seabream (Sparus aurata)". Thesis, University of Stirling, 2008. http://hdl.handle.net/1893/615.
Testo completoAbstract (sommario):
The current general economic and food crises have generated an unsettled future for food and feed production and prices in general. Increasing demand, prices and fluctuations in supply in world markets for fishmeal, fish oil, soybean meal, maize and wheat meal emphasize the need to reduce the dependence of the fish feed industry on these ingredients by increasing choices among a wider range of raw materials. Legume seed such as peas, chickpeas and faba beans are promising ingredients for aquafeeds due to their high protein compared to cereals but also for their energy content. The objective of the present study was to investigate the use of these legumes in both high and low inclusion level in diets for the two main species farmed in the Mediterranean countries namely, European seabass (Dicentrarchus labrax L.) and gilthead seabream (Sparus aurata L.). In Chapter 3 the effects of different processing conditions were examined on whole seed flours of tested ingredients with respect to both nutritional and antinutritional factors and physical characteristics of the experimental diet pellets including high and low levels of each legume. Extrusion of raw material resulted in a clear reduction in trypsin inhibitors (TI) with chickpeas showing a decrease of up to 90% and complete inactivation for wheat flour, while for peas and faba beans reduction was less than 50% in most cases. Extrusion processing was less effective in the reduction of phytic acid and total tannins, occasionally reaching 22% and 18% respectively. Oligosaccharides and total NSP were not drastically affected by processing, however faba bean NSP showed greater reduction. A redistribution of soluble and insoluble NSP fractions was noted for chickpea and pea flours after extrusion. Physical characteristics of the pellets were not negatively affected for any of the tested diets. In Experiment I the effects of total or partial wheat substitution by legumes were investigated on nutrient digestibility, gastrointestinal evacuation rate and serum glucose response of European seabass. Use of legumes in seabass and seabream diets resulted in an overall increase in gastrointestinal evacuation time and a delay in glucose load. Specifically, gastric evacuation time was greatly delayed when seabass was fed a diet with high levels (30%) of chickpeas, while foregut evacuation time was mostly delayed by the diet including a high level (30%) of faba beans. In addition, glucose levels in seabass serum were also affected by the type of carbohydrates ingested with wheat starch showing more rapid increase and decrease of glucose compared to fish fed pea and chickpea diets, while faba bean starch resulted in a lower glucose peak. In Experiment II growth, digestibility, hematological parameters, histological effects and fillet organoleptic characteristics and the interaction between starch inclusion level (8% and 16% or 17% and 35% of legumes respectively) and legume type were estimated when tested legumes replaced wheat in European seabass diets. Digestibility coefficients were satisfactory for all nutrients (>93%) while legume diets at a low level had beneficial effects on growth parameters when compared to the control diet, with chickpeas showing a significant improvement in SGR (P<0.05). High level legume diets did not result in any negative effect on growth. HSI was increased with increasing starch/legume inclusion in the feed and serum glucose also increased for fish fed high levels of faba beans and chickpeas. Carcass proximate composition was not affected by replacement of wheat in the diets, excluding the increase of fat content in fish fed chickpeas. Sensory analysis showed no differences between fish fed the control and high legume inclusion diets. Lastly in Experiment III growth, hematological parameters, histological effects and the interaction between starch inclusion level (low and high) and legume type were evaluated when tested legumes were included in gilthead seabream diets. Decreased, but not significantly so, growth was observed for all diets including legumes compared to the control. Poorer SGR were observed for pea and faba bean diets when these legumes were included at high levels. Liver glycogen increased with increasing starch level, but HSI did not differ significantly for any of the diet treatments. Histological examination of hindgut did not show pathological effects, such as enteritis, for in either species or for any of the diets. Increased absorptive vacuoles were found for control and pea diets (high level) only for seabass. The findings of this thesis showed that the two important species cultivated in Mediterranean countries responded differently to the same raw materials used at high levels in the diets. Overall legumes had a strong effect on gastrointestinal evacuation reducing the rate of feed or digesta passage. Peas, chickpeas and faba beans successfully replaced wheat in seabass diets resulting in improved growth coefficients. However, when the same legumes included in seabream diets growth performance was not improved compared to the wheat based diet.
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Мазепа, О. В. "Оптимізація технології вирощування пшениці озимої після пізніх попередників в умовах ФГ «Талісман-Агро»". Thesis, Чернігів, 2021. http://ir.stu.cn.ua/123456789/25085.
Testo completoAbstract (sommario):
Мазепа, О. В. Оптимізація технології вирощування пшениці озимої після пізніх попередників в умовах ФГ «Талісман-Агро» : випускна кваліфікаційна робота : 201 "Агрономія" / О. В. Мазепа ; керівник роботи В. І. Канівець ; НУ "Чернігівська політехніка", кафедра аграрних технологій та лісового господарства. – Чернігів, 2021. – 61 с.В роботі висвітлено актуальне питання посіву пшениці в пізні строки та шляхи оптимізації технологічного процесу її вирощування з метою отримання високого рівня продуктивності. Проаналізовано вплив азотного підживлення на розвиток рослин. Запропоновано алгоритм дій для підтримання продуктивності озимої пшениці після пізніх попередників.
The paper highlights the current issue of sowing wheat in the late period and ways to optimize the technological process of its cultivation in order to obtain a high level of productivity. The influence of nitrogen fertilization on plant development is analyzed. An algorithm of actions to maintain the productivity of winter wheat after the late predecessors is proposed.
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Sá, Jocelito Saccol de. "Influência do manejo do nível freático e doses de nitrogênio em culturas sob hipoxia no solo". Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/11/11143/tde-10032006-164551/.
Testo completoAbstract (sommario):
Em diversos países, extensas áreas agrícolas são afetadas por inundações temporárias que ocasionam significativos prejuízos à produção de alimentos. Os objetivos deste trabalho foram: a) avaliar os efeitos da exposição de plantas de lentilha (Lens culinaris Medik) ao estresse por excesso hídrico em relação ao manejo do nível freático; b) avaliar o comportamento de cultivares de soja (Glycine max L. Merrill) a hipoxia e à aplicação de nitrogênio na atenuação dos danos ocasionados pelo excesso hídrico e c) avaliar as respostas de plantas de trigo (Triticum aestivum, L.) à saturação hídrica, total ou parcial, da camada de solo correspondente à zona radicular da cultura. Em plantas de lentilha, o excesso de água no solo reduziu a expansão foliar, o acúmulo de biomassa, a produção de grãos e reduziu a concentração de N, K, Ca, Mn e Mg nas folhas e intensificou o processo de senescência foliar. As taxas de ascensão e de rebaixamento do nível freático de 15 e 30 cm dia-1 influenciaram positivamente o desenvolvimento e a produção. Os danos mais drásticos foram ocasionados pela elevação e pelo rebaixamento do nível freático em 5 cm dia-1. O efeito negativo da inundação do solo na produção de grãos foi reduzido em 21% pelo aumento da taxa de ascensão e de rebaixamento do nível freático de 5 para 30 cm dia-1. A adição de 50 kg N ha-1 não minimizou os danos ocasionados pela hipoxia. Em soja, a área foliar, o acúmulo de matéria seca, a produção e a qualidade dos grãos dos cultivares decresceram com o prolongamento da inundação do solo. Os teores foliares de N, K, Mg e Mn decresceram linearmente e a concentração de Fe aumentou com a inundação do solo. O cultivar FT-Abyara apresentou maior crescimento vegetativo e o cultivar CD205 maior produtividade e maior teor protéico. Os maiores danos à produção foram ocasionados pela inundação do solo por período superior a 48 h. A aplicação de 50 e 100 kg N ha-1 aumentou o crescimento da parte aérea das plantas, a produção e a concentração de proteína dos grãos. O cultivar FT-Abyara apresentou melhores resultados à adição de N. A aplicação de N reduziu em 15% os danos causados pelo excesso de água no solo à produção de grãos. Em plantas de trigo, a saturação hídrica do solo intensificou a senescência das folhas, reduziu a produção de matéria seca, a taxa de crescimento da cultura e prejudicou a produção de grãos. Os efeitos ocasionados pela ocupação total dos poros do solo pela água foram mais severos para o desenvolvimento e a produção de grãos do que a saturação parcial dos poros pela água. O nível freático a 15 cm de profundidade minimizou em 30% os danos ocasionados pelo excesso de água no solo à produção de grãos. A aplicação de 50 kg N ha-1 reduziu em 16% os danos ocasionados pela saturação hídrica do solo à produção de grãos.In many countries, extensive agricultural areas are affected by short-term waterlogging that cause significant damages to the crop yields. The objectives of this work were: a) to evaluate the stress effect of the soil water excess on lentil plants (Lens culinaris Medik) related to water table management; b) to evaluate the behavior of soybean cultivars (Glycine max L. Merrill) to hypoxia conditions and to the nitrogen supplying for reducing flood damages c) to evaluate wheat (Triticum aestivum, L.) responses to complete or partial soil water saturation in the root zone. On lentil plants the excess of water reduced the growth of the leaves, the dry matter and grain production and the concentration of N, K, Ca, Mn and Mg in leaves. Also the senescence process was increased. The elevation and lowering by 15 and 30 cm day-1 affected positively the crop development and yield production. The most severe damage was induced by rate elevation of 5 cm day-1 and drawdown of water table. The increasing of water table ascension and lowering rate from 5 to 30 cm day-1 alleviated the damage effect on grain production in 21%. Hypoxia injuries were not minimized by a supplemental addition of 50 kg ha-1 of nitrogen. The leaves area, shoot dry matter accumulation, the grain production and the grain protein concentration of soybean plants were reduced proportionally to the flooding duration. The N, K, Mg and Mn concentration in leaves decreased linearly while Fe concentration increased for the waterlogging duration. The soybean cultivar FT-Abyara showed the higher vegetative growth, while CD205 produced a greater grain yield and grain protein concentration. A flooding period of 48 h caused severe damage to grain yield. The leaf area, shoot growth, grain yield and grain protein increased with supplemental N application of 50 and 100 kg N ha-1. The soybean cultivar FT-Abyara showed the best results due to the nitrogen supply. The N addition reduced the grain production damages by 15%. In wheat plants, the water excess increased leaves senescence, reduced dry matter and the growth rate and produced a significant decreasing on grain weight. The effects caused by total water saturation of soil pores were more severe to the plant growth and grain yield than those caused by partial water saturation, even for large periods. A water table at 15 cm depth minimized by 30% the harmful effects of water excess to the grain production. The application of 50 kg N ha-1 reduced by 16% the damages on the crop yield caused by flooding.
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Yang, Feng. "Nutritional evaluation of germinated wheat and its use in a nutritional bar". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0014/MQ60198.pdf.
Testo completo
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Austin, Sean. "Structural characterisation of anti-nutritional polysaccharides in wheat". Thesis, University of Nottingham, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387682.
Testo completo
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Adesogan, Adegbola Tolulope. "Prediction of the nutritive value of whole crop wheat". Thesis, University of Reading, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320195.
Testo completo