Tesis sobre el tema "Nutrient additions"
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Hadwen, Wade Lynton y w. hadwen@mailbox gu edu au. "Effects of Nutrient Additions on Dune Lakes on Fraser Island, Australia". Griffith University. Australian School of Environmental Studies, 2002. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20030304.091718.
Texto completoWitkowski, Edward Tadeusz Fernando. "Response of a sand-plain lowland fynbos ecosystem to nutrient additions". Doctoral thesis, University of Cape Town, 1988. http://hdl.handle.net/11427/8408.
Texto completoThe effects of a complete factorial fertilizer addition of nitrogen (N), phosphorus (P) and a mixture of all essential nutrients excluding N and P (M) on various components of the soils and vegetation of a sand-plain lowland fynbos ecosystem at Pella, south-western Cape Province, South Africawere studied, namely: 1) Soil nutrient dynamics. 2) Phenology, shoot growth, reproductive output and nutrient acquisition in a proteoid (Leucospermum parile) and an ericoid (Phylica cephalantha) evergreen shrub. 3) Dry mass, phosphorus and nitrogen allocations to the various above and below ground organs of pre-reproductive and reproductive male plants of Thamnochortus punctatus (Restionaceae). 4) Litter production and nutrient return. 5) Above-ground phytomass, nitrogen and phosphorus contents of the representative plant growth forms in response to non-factorial addition of N, P and M. 6) Foliage projective cover of the representative growth forms of sand-plain lowland fynbos.
Hadwen, Wade. "Effects of Nutrient Additions on Dune Lakes on Fraser Island, Australia". Thesis, Griffith University, 2002. http://hdl.handle.net/10072/368084.
Texto completoThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Australian Environmental Studies
Full Text
Irvine, K. "Zooplankton ecology and the effects of nutrient additions, habitat structure and fish predation on a freshwater ecosystem". Thesis, University of East Anglia, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378900.
Texto completoSmith, Russell Stephen. "Mineral nutrient influxes and additions and their effects in a Banksia woodland ecosystem in South Western Australia". Thesis, Smith, Russell Stephen (1990) Mineral nutrient influxes and additions and their effects in a Banksia woodland ecosystem in South Western Australia. Honours thesis, Murdoch University, 1990. https://researchrepository.murdoch.edu.au/id/eprint/41520/.
Texto completoCamenzind, Tessa [Verfasser]. "Responses of arbuscular mycorrhizal fungi to nutrient additions in a tropical montane forest of Southern Ecuador / Tessa Camenzind". Berlin : Freie Universität Berlin, 2016. http://d-nb.info/1098185293/34.
Texto completoRhein-Welker, Deanna. "Performance and nutrient digestibility in weanling pigs as influenced by yeast culture, whey, and fiber additions to starter diets". Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-07292009-090510/.
Texto completoBergholm, Johan. "Long-term effects of enhanced nitrogen and sulphate additions on soil acidification and nutrient cycling in a Norway spruce stand /". Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 2001. http://epsilon.slu.se/avh/2001/91-576-6099-9.pdf.
Texto completoMaloney, Caitlin E. "The effects of micronutrient additions on soil invertebrate activity and community structure along a successional gradient". Bowling Green State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1498074605780196.
Texto completoPerkins, Rupert Gordon. "Phosphorus limitation in Alton Water reservoir". Thesis, University of Essex, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.265030.
Texto completoSorabella, Laurie Ann. "Oyster Reef Restoration in Virginia: Broodstock Addition & Nutrient Exchanges". W&M ScholarWorks, 2002. https://scholarworks.wm.edu/etd/1539617787.
Texto completoGabor, T. Shane (Thomas Shane). "Nutrient addition experiments in the interlake region of Manitoba : effect of single pulse addition in spring". Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59941.
Texto completoDissolved nutrients in the high and low treatments were quickly depleted from the system but dissolved N increased in the alfalfa treatment as decomposition progressed. No changes in sediment or vegetation chemistry were detected. Phytoplankton biomass increased in all the fertilized enclosures while epiphytic periphyton exhibited only minor responses. Epipelon biomass increased in the alfalfa treatment and metaphyton standing crops were extensive in the high treatment enclosures.
In the alfalfa treatment, high microbial respiration rapidly decreased dissolved oxygen concentrations which negatively affected invertebrates. This trend reversed as oxygen levels increased. Dominant nektonic and benthic herbivores-detritivores increased in the high and alfalfa treatment enclosures. Orthocladiinae emergence increased in the high and alfalfa treatments while Chironominae and Tanypodinae increased in the alfalfa treatment. Responses by algae and invertebrate communities to the fertilization treatments were minimal during 1990. Annual single pulse fertilization has the potential to increase the productivity of Interlake wetlands.
Halun, Sitti Zayda B. "The Effects of Fertilization and Simulated Grazing on the Community Structure of a Seagrass Bed in South Florida". FIU Digital Commons, 2011. http://digitalcommons.fiu.edu/etd/415.
Texto completoNogueira, Carla de Almeida. "Responses and mechanisms of a mediterranean grassland ecosystem to nutrient addition". Doctoral thesis, ISA/UL, 2018. http://hdl.handle.net/10400.5/17509.
Texto completoGlobal changes, resulting from anthropogenic activities, are increasing precipitation variability, drought and nutrient inputs into ecosystems. These global change drivers are expected to induce changes in grassland species richness and composition and functional structure and diversity which may in turn affect ecosystem functioning. This is particularly important for the Mediterranean basin, a climate change hotspot. Understanding how these changes affect grassland structure and functioning is critical to anticipate impacts of global change, improve management actions and develop land management strategies and restoration tools to mitigate grassland degradation. Through a pot greenhouse experiment, we applied three levels of extended autumn drought and two levels of nitrogen deposition to grassland communities. The severe drought originated a shorter growing season, and led to lower net ecosystem exchange and gross primary productivity, which translated into reduced productivity. Drought induced changes in functional group proportion and delayed plant phenology. Nitrogen addition did not affect productivity, diversity or phenology. However, nitrogen interacted with the severe drought treatment to attenuate the negative effects on total carbon fluxes. A 5-year nutrient addition field experiment was also conducted. Nitrogen, phosphorus and potassium were added in a factorial way to establish three treatments of one, two and three added nutrients, including controls. Grassland productivity was co-limited by multiple nutrients and precipitation. Nutrient addition decreased species richness and interacted with climatic variability to alter functional group composition. Resilience to disturbance was not affected by nutrient addition, as resistance that decreased with nutrient enrichment due to lower species richness was cancelled out by increased recovery due to the dominance of competitive graminoids. Community functional structure was affected by nutrient addition and precipitation and, for some traits, by their interaction and was the main determinant of productivity. Functional diversity was affected by precipitation, with drought negatively affecting community functional diversity
N/A
Bector, Savita 1962. "Nutrient density of the infants diet after the addition of supplementary foods". Thesis, The University of Arizona, 1990. http://hdl.handle.net/10150/278161.
Texto completoFinkler, Nícolas Reinaldo. "Dinâmica da retenção de nitrogênio e fósforo em riachos tropicais do bioma Cerrado (SP)". Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/18/18138/tde-20062018-105639/.
Texto completoAquatic systems are responsible for key ecosystems services, providing direct and indirect benefits for human beings such as well-being, health and socio-economic development. The ecosystem service of water purification is one of their main functions. Nutrient uptake in surface waters is a combination of physical, chemical and biological mechanisms which transform the nutrient in a downstream direction. The nutrient uptake has been mostly studied in temperate environments, but little is known about how the environmental characteristics of tropical systems could affect it. The main objective of this study was to estimate the nutrient uptake in streams located in the Cerrado biome (SP). In addition to the physical and chemical characteristics, nitrate, ammonium and phosphate uptake rates were evaluated in reaches of four streams characterized by gradients of environmental concentrations. Also we tested hypotheses regarding the level of nutrient enrichment and the role of tropical streams on the whole ecosystem uptake. From January to October 2017, nutrient additions were carried out according to the Tracer Additions for Spiraling Curve Characterization method, in order to model and quantify nutrient uptake metrics (uptake lenght, uptake rate and uptake velocity under ambient conditions) and to characterize the kinetics of each addition. The streams were ranked according to the level of enrichment by phosphate, since its concentrations showed significant variation across streams. Significant spatial differences were found across streams, while no temporal differences were observed among sampling periods. In general, non-enriched streams generally had lower uptake lengths (8-418 m for nitrate, 38-172 m for ammonium and 60-560 m for phosphate) in comparison to enriched streams (56-508 m for nitrate, 35 -253 m for ammonium and 77-391 m for phosphate). Non-enriched streams showed higher uptake velocities (maximum of 123 mm min-1 for nitrate, 68 mm min-1 for ammonium and 17 mm min-1 for phosphate), as well as uptake rates (µg m-2 min-1) greater than enriched streams. Nitrate had higher ambient uptake rates (geometric mean of 999.3 µg m-2 min-1), while ammonium had lower ambient uptake length (geometric mean of 85.7 m) and higher ambient uptake velocity (geometric mean of 6.9 mm min-1). The uptake kinetics modelling suggested that no nutrient saturation occurred in any case. The Efficiency-Loss kinetic model had better fit to the experimental data than Michaelis-Menten and first-order kinetic models. The retention metrics obtained are higher than those normally reported in the literature for low-order streams in other biomes, which highlights the importance of preservation and conservation of tropical streams. Special attention should be given to the control and management of the land use forms in these watersheds. The studied streams play a relevant role as sinks of N and P, indicating they are strategic watercourses regarding the environmental service of nutrient uptake.
Bock, Emily Maclauren. "Greenhouse Gas Production and Nutrient Reductions in Denitrifying Bioreactors". Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/64278.
Texto completoMaster of Science
Bock, Emily. "Greenhouse Gas Production and Nutrient Reductions in Denitrifying Bioreactors". Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/64278.
Texto completoMaster of Science
Cloutier, Renée R. "Effects of nutrient addition mode on jack pine, Pinus banksiana Lamb., seedling outplanting performance". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape16/PQDD_0026/MQ31420.pdf.
Texto completoRichardson, Sarah Jane. "Response of a sub-Arctic dwarf shrub heath community to nutrient addition and warming". Thesis, University of Sheffield, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.251133.
Texto completoBeck, Michael. "THE EFFECT OF CHRONIC NUTRIENT ADDITION FROM WASTEWATER ON FOREST ECOSYSTEMS AT THE RICE RIVERS CENTER". VCU Scholars Compass, 2017. https://scholarscompass.vcu.edu/etd/5164.
Texto completoWilliams, Rachel. "Effectiveness of Biochar Addition in Reducing Concentrations of Selected Nutrients and Bacteria in Runoff". UKnowledge, 2016. http://uknowledge.uky.edu/bae_etds/40.
Texto completoWiese, Benjamin. "Control and Modeling of Plant Growth : A versatile system for mineral nutrient addition and feed-back monitoring". Thesis, KTH, Reglerteknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-104617.
Texto completoWilson, Daniel T. "Grass invasion in urban lowland fynbos fragments on the Cape Flats : does nutrient addition play a role?" Bachelor's thesis, University of Cape Town, 1999. http://hdl.handle.net/11427/25608.
Texto completoREIS, ROGERIO A. de S. "Caracterização de componentes inorgânicos em suplementos nutricionais pelo método de análise por ativação com nêutrons". reponame:Repositório Institucional do IPEN, 2006. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11401.
Texto completoMade available in DSpace on 2014-10-09T14:02:00Z (GMT). No. of bitstreams: 0
Dissertacao (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
Lindberg, Niklas. "Impact of climate change on soil fauna diversity : effects of experimental drought, irrigation, soil warming and nutrient addition /". Uppsala : Swedish Univ. of Agricultural Sciences, 2001. http://epsilon.slu.se/avh/2001/99-3576673-X.pdf.
Texto completoWeeber, Russell C. "Nutrient addition and the use of stable isotope techniques in wetlands of the Interlake Region of Manitoba, Canada". Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=22825.
Texto completoIn general, the effects of nutrient additions were confined to 1992. Treatment enclosure dissolved oxygen levels decreased immediately following fertilization, recovering in the low treatments by early June. Low oxygen conditions persisted in whole high enclosures throughout most of 1992. Dissolved and suspended nutrient concentrations, and phytoplankton chlorophyll a increased but, with the exception of dissolved N, were soon lost from the water column. Treatment enclosure epiphytic algae increased while epipelon did not respond to fertilization. The primary effect of fertilization on invertebrate production was an increase in treatment enclosure chironomid larvae during 1992. As with productivity measures, stable isotope ratio values suggested a temporary presence of alfalfa nutrients in the enclosed food webs. Only the isotope ratios of metaphytic algae and snails collected during August 1992 indicated an incorporation of alfalfa nutrients.
Wotherspoon, Katherine. "The effect of phosphorus addition and cutting date on the nutrient dynamics and species composition of floodplain meadows". Thesis, Open University, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.757703.
Texto completoCubas, Suazo Alexa Maria. "Occoquan Reservoir and Watershed: A Water Quality Assessment 1973–2019". Thesis, Virginia Tech, 2021. http://hdl.handle.net/10919/103037.
Texto completoMaster of Science
The Occoquan Reservoir is part of the largest indirect potable reuse systems in the United States. Indirect potable reuse refers to the planned discharge of reclaimed water into a water supply source, such as a reservoir or lake. The Occoquan Reservoir also serves as an ecological and recreational area, and serves to protects the water quality of the Chesapeake Bay because it acts as a trap for sediments and pollutants. To protect the different ecosystem services that the reservoir provides, it is critical to continuously monitoring and evaluate its water quality. Reservoir water quality can be affected by the delivery of pollutants from industrial and municipal waste discharges (point sources), as well as, from urban and agricultural runoff (nonpoint sources). Contaminants include nutrients (such as nitrogen and phosphorus), ions, metals, and synthetic organic compounds (SOCs) that can affect human and aquatic health. Different management strategies have been implemented at the Occoquan Reservoir to reduce load of pollutants into the reservoir, particularly to reduce concentrations of nutrients, as excessive nutrients can degrade water quality. Two strategies implemented are the addition of nitrogen, in the form of nitrate, and the installation of an oxygenation system at the reservoir bottom waters. The goal of this study is to assess how current management strategies implemented in the Occoquan Reservoir have affected the water quality from 1973 to 2019, with particular emphasis on the data since 2003. This analysis of the Occoquan Reservoir and its tributary watershed includes the evaluation of the hydrological, meteorological, and morphometric characteristics of the Occoquan Reservoir and Watershed; establishment of long-term trends for water quality constituents; and determination of the productivity (trophic state) of the reservoir. Data from water samples from four different stations located at the reservoir and four stations located throughout the watershed were analyzed for nutrients, principal ions and metals, SOCs, and other water parameters indicative of water quality. Statistical analyses were employed to determine long-term water quality trends (Mann-Kendall test) and relationship between constituents (Principal Component Analysis - PCA). The trophic state of the reservoir was assessed using three methods: Carlson's Trophic State Index (TSI), Vollenweider Model, and Rast, Jones, and Lee's Model. Results indicate the Occoquan Reservoir is eutrophic, or highly enriched with nutrients and productive. However, management strategies employed have improved the water quality and the reservoir continues to improve, though at a slow rate.
Welch, Anthony Richard. "The effect of anthropogenic nutrient addition on the growth and competitive abilities of Parmelia caperata, P. reddenda, P. saxatilis and Xanthoria parietina in Cornwall". Thesis, Open University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289005.
Texto completoDornelas, Lívia Carrasco. "Efeito da temperatura ambiente e suplementação da dieta com protease no desempenho e utilização de nutrientes em frangos de corte". Botucatu, 2017. http://hdl.handle.net/11449/151444.
Texto completoResumo: Avaliou-se o efeito da suplementação de protease na digestibilidade e desempenho de frangos de corte em ambiente termoneutro e estresse cíclico pelo calor. Foram utilizados 320 pintos machos Cobb de um dia distribuídos casualmente em esquema fatorial 2x2x2 [ambiente termoneutro ou ambiente quente x dieta atendendo as exigências nutricionais (controle positivo, CP) ou reduzida 6% em proteína bruta e aminoácidos (controle negativo, CN) x protease: 0 ou 200ppm] com 8 repetições. De 1 a 7 dias de idade, a conversão alimentar (CA) foi melhor em frangos CN quando em ambiente termoneutro, e quando em ambiente quente, a CA melhorou com a dieta CP. Frangos em ambiente termoneutro apresentaram melhor CA e maior ganho de peso no período de 1 a 14 dias. Maior consumo de ração e ganho de peso foram observados em frangos mantidos em ambiente termoneutro nos períodos de 1 a 21 dias e 1 a 35 dias de idade. No período de 1 a 35 dias de idade houve interação entre dieta e protease, sendo que frangos que receberam dietas CP apresentaram melhor CA quando receberam protease. Frangos que receberam protease melhoraram a conversão alimentar quando consumiram CP comparados aos que receberam CN. A suplementação de protease favoreceu balanço de nitrogênio, coeficiente de metabolizabilidade da proteína bruta e da matéria seca e a energia metabolizável aparente e energia metabolizável aparente corrigida pelo nitrogênio em frangos de corte em ambiente quente com dieta controle positivo. Concluindo, o estr... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The objective of the current study was to evaluate the effects of protease supplementation on diet digestibility and growth performance of broilers raised under thermoneutral condition and cyclic heat stress. In a 2x2x2 factorial system [thermoneutral condition or heat stress vs. diets formulated to meet nutritional (positive control, PC) or diets with crude protein and amino acids below requirements by 6% (negative control, NC) x Protease: 0.200ppm], 320 one-day-old male Cobb broilers were distributed in 8 replicates. From 1 to 7 days of age, feed conversion ratio (FCR) was better in thermoneutral condition, and in heat stress, feed conversion ratio (FCR) was better when consume PC. Broilers in thermoneutral environment presented best FCR and greater weight gain during the period from 1 to 14 days. Increased feed consumption and weight gain were observed in broilers kept in thermoneutral environment in periods of 1 to 21 days and 1 to 35 days old. During the period from 1 to 35 days of age there was interaction between diet and protease, and broilers that were given diets CP presented best FCR when they received protease. Broilers receiving protease improved feed conversion when consumed PC compared to those receiving NC. Protease supplementation favored nitrogen balance, metabolizable crude protein, dry matter, apparent metabolizable energy and nitrogen-corrected apparent metabolizable energy in broiler chickens in heat stress with positive control diet. In conclusion, heat... (Complete abstract click electronic access below)
Mestre
Loures, Daniele Rebouças Santana. "Enzimas fibrolíticas e emurchecimento no controle de perdas da ensilagem e na digestão de nutrientes em bovinos alimentados com rações contendo silagem de capim Tanzânia". Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/11/11139/tde-16072004-155623/.
Texto completoThe present trial aimed to evaluate the effect of fibrolytic enzymes on forage cell wall degradation, when applied either during the ensiling process or just before the animal feeding. The experiment I analyzed the effects of wilting (wet vs wilted), particle size reduction (small vs large) and the addition of fibrolytic enzymes (alone vs combined with Lactobacillus plantarum) on the fermentation and ensiling losses of Tanzania grass (Panicum maximum, Jacq. cv. Tanzania). Forage was harvested and cut at 45-day vegetative re-growth period and stored in experimental plastic silos (50 L) during 136 days. During the storage period, the effluent flow was collected and measured at days 1, 2, 7, 14, 21, 60, 90 and 136. Total silage losses were not affected by particle size reduction, even though the smallest particle size promoted better aerobic stability of the silage. The rate of silage DM recovery, effluent and gases losses were 72, 5 e 23 % for wet and 80, 0 e 21% for wilted silages, respectively. The addition of fibrolytic enzymes exclusively or combined with Lactobacillus plantarum led to decreased concentrations of NDF, ADF, cellulose and hemicellulose mainly on wilted silages, however, no benefit was observed in the in vitro DM digestibility. Mean values for BOD (11.289 mg L 1), COD (36.279 mg L 1), and the ratio COD/BOD (3.35) were observed on the effluent of wet silages, which increased the potential of environmental pollution with the longer silage storage period. The experiment II aimed to study the effects of forage wilting or fibrolytic enzymes addition to the Tanzania grass silages. Treatments consisted of: A - wilted forage without enzymes; B - fresh forage without enzymes; C - wilted forage with enzymes at ensiling (2 L t-1 wet forage); D - fresh forage with enzymes at ensiling; E - enzymes applied onto silage (10 L t-1 wet silage) 30 minutes before feeding (direct-fed). Five ruminally cannulated Nellore beef steers were randomly assigned to a 5 x 5 Latin square design. The ruminal passage rate of solid (2.23 % hour 1) and liquid (4.83 % hour 1) phases were similar for all treatments. The animal ingestive behavior measured as total time (minutes day-1) and rate (minutes DM kg-1) was not changed across silages DM concentration, averaging DM eating (247; 24), DM ruminating (426; 43) and DM chewing (673; 67), respectively. The molar concentration (109.62 mM) of total volatile fatty acids (VFA) and ammonia-N (5.6 mg dL-1) observed in ruminal fluid were similar across silages diets. According to the results it may be concluded that wilting Tanzania grass or the application of fibrolytic enzymes did not improve significantly either the animal ingestive behavior, ruminal parameters or the nutrient digestibilty.
Coelho, Rodrigo Michelini. "Efeitos da concentração de matéria seca e do uso de inoculante bacteriano-enzimático, na silagem de tifton 85 (Cynodon spp.), sobre a digestão de nutrientes, parâmetros ruminais e comportamento ingestivo em novilhos de corte em crescimento". Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/11/11139/tde-19122002-163719/.
Texto completoThe present trial aimed to study the effects of forage wilting associated or not with a bacterial-enzymatic inoculant on ensiling Tifton 85 grass. Front panel of experimental silos (325 kg square wrapped bales) were daily scored for fungi development and weekly sampled for chemical composition analysis and particle chop length measurements. In a randomized 7 x 7 Latin square design, seven ruminal cannulated growing beef steers were assigned to diets (treatments) containing 80% silage. Periodically chewing behavior, feed intake, ruminal mat consistency, ruminal fermentation parameters, nutrient digestibility and ruminal rate of passage of solids and liquids phases were evaluated. Treatments combined 3 planned dry matter (DM) concentrations (25, 45 and 65%) of Tifton 85 grass silage associated (CA) or not (SA) with the bacterial-enzymatic (BE) inoculant source. An additional treatment containing wilted silage (55% DM) without (BE) was also studied. SIL-ALL®, the BE source used, was sprayed onto chopped forage just before silage packing at a rate of 250g diluted in 50L of deionized water per ton of wet forage. The commercial BE showed the following composition: Streptococus faecium, Lactobacillus plantarum, Pediococcus acidilactici plus hemicellulase, cellulase and starch degrading enzymes. The wilting of forage allowed to increase the DM concentration of silages, however, as well as BE addition, it was not effective to promote major changes on chemical composition of silages. On SA silages, higher NDF levels were observed as the DM level of the wilted silage increased, which resulted in lower non-fiber carbohydrate (NFC) fraction. The B3 protein fraction (NDIN minus ADIN) showed an increase as the DM concentration of wilted silage was raised, probably as result of an opposite trend between neutral detergent insoluble nitrogen (NDIN) and acid detergent insoluble nitrogen (ADIN) across DM levels. Silage losses, measured as both, fungi scored at bale front panel and percentage of spoiled silage, indicated higher levels associated with increased DM concentration. It might be explained by the lower bale unloading rate observed during the feeding trial, mainly in higher DM wilted silages. Both, ruminal mat consistency, measured as time required to weight ascension into the rumen (1194 sec.) as well as ruminal kinetics, evaluated as passage rate of solid (3.09% hour -1 ) and liquid (4.37% hour -1 ) phases were similar for all treatments. Animal ingestive behavior measured as total time (minutes day -1 ) and rate (minutes DM kg -1 ) was not changed across silages DM concentration, averaging DM eating (324; 47), DM ruminating (518; 75) and DM chewing (841; 123), respectively. Residual daily time was spent with drinking and idling activities. The DM intakes observed among experimental diets, containing wilted silages, were not statistically different and averaged 6.95 kg day -1 or 1.88% as body weight basis. Individual and total (140.29) molar concentration (mM) of volatile fatty acids (VFA), acetate:propionate ratio (4,2:1), ammonia-N (6.31 mg dL -1 ) and average daily pH (6.76) of ruminal fluid were similar across silages diets. Nutrient digestibilities were, also, not significantly affected by the increased DM concentration in wilted silages or by the BE inoculation, as follows: organic matter (71.5%), crude protein (69.1%), NDF (71.3%), ADF (64.9%) and hemicellulose (83.3%). DM digestibilities, however, performed a quadratic pattern (P<0.05), with a slight increase at 45% DM concentration in silages. According to the results it may be concluded that neither the increase of DM concentration of grass silages nor the addition of bacterial-enzymatic inoculant changed animal ingestive behavior or improved ruminal and digestive parameters analyzed.
Dalmet, Christophe. "La notion de denrées alimentaires". Phd thesis, Université d'Avignon, 2009. http://tel.archives-ouvertes.fr/tel-00629627.
Texto completoRulon, Leslie. "Effects of Nutrient Additions on Three Coastal Salt Marsh Plants Found in Sunset Cove, Texas". Thesis, 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8798.
Texto completo"The effects of nutrient additions on the sedimentation of surface water contaminants in a uranium mined pit-lake". Thesis, 2005. http://hdl.handle.net/10388/etd-05282012-111234.
Texto completoMatson, Amanda. "Canopy soil nutrient cycling and response to elevated nutrient levels along an elevation gradient of tropical montane forests". Doctoral thesis, 2014. http://hdl.handle.net/11858/00-1735-0000-0022-5E97-C.
Texto completoGreen, Eleanor Virginia. "Nutrient addition and crop yield of an alley cropping system in the piedmont of Georgia". 2002. http://purl.galileo.usg.edu/uga%5Fetd/green%5Feleanor%5Fv%5F200205%5Fms.
Texto completoTahir, Shermeen. "Clay amended sandy soil – influence of clay concentration and particle size on nutrient availability and organic carbon content after plant residue addition". Thesis, 2017. http://hdl.handle.net/2440/119196.
Texto completoThesis (Ph.D.) -- University of Adelaide, School of Agriculture, Food & Wine, 2017
Kung, Tsai-Wei y 龔采薇. "Effect of Dietary Sangrovit (SGV) Addition on Nutrient Utilization in Early Lactation Primipara Dairy Does and Weaned Kids". Thesis, 2019. http://ndltd.ncl.edu.tw/handle/24ayek.
Texto completo國立宜蘭大學
生物技術與動物科學系動物科學碩士班
107
Sangrovit (SGV) is a phytobiotic feed additive extracted from Macleaya cordata. The active substances are alkaloids which can enhance appetite and reduce intestinal inflammation. Such actions may improve nutrient utilization by animals. Experiment 1 investigated the effects of SGV (0.04 g/kg BW/day) in diets on nutrient digestion, nitrogen balance, milk traits and plasma traits in early lactation of primiparous dairy does. Primiparous dairy does (n=6) in early lactation were allocated randomly, according to the initial weight, to the control and the SGV treatments. During the period, water and block salt were given ad libitum, but bermudagrass straw (1.7 % body weight) and concentrate (1.31 % body weight) was restricted giving. The results show that, adding SGV, the water intake were not significant different. Total tract nutrient digestibility of non-fiber carbohydrate was lower than the control (P<0.1), but total tract nutrient digestibilities corrected for body weight were of no significant differences. Urine volume changes was not different, but urinary nitrogen excretion were increased (P<0.10). Milk volume, body weight changes and plasma traits were not different. Experiment 2 investigated the effects of SGV (0.04 g/kg BW/day) in diets on nutrient digestion, nitrogen balance, milk traits and plasma traits of weaned kids. Weaned kids (n=5) were allocated by random, according to the initial weight, to the control and the SGV treatments. During the period, water and block salt were given ad libitum, but bermudagrass straw (0.36 % body weight) and concentrate (1.39 % body weight) was restricted giving. The results show that, adding SGV, the water intake were not significant different. Total tract nutrient digestibility of dry matter was significant higher than control (P<0.05), and total tract nutrient digestibility of organic matter was also higher (P<0.1), but total tract nutrient digestibilities corrected for body weight were of no differences. Urine volume corrected for body weight was lower than control (P<0.1), and urine volume corrected for metabolic body weight was significant lower than control (P<0.05), but urinary nitrogen excretion were not significant different. The concentration of plasma total protein was significant lower than control (P<0.05) before the meal, and the concentration of globulin was lower than control (P<0.10) before the meal. Body weight changes were not significant different. Based on the results from the two thesis experiments, it appears that SGV decreased total tract nutrient digestibility of non-fiber carbohydrate in early lactation of primiparous dairy does, and weaned kids that supplemented with SGV, promoted nutrient digestion and reduced globulin concentrations before the meal.
Biggs, Patrick Edward. "The effect of various feed additives on growth performance, nutrient utilization, and cecal microbial populations in poultry /". 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3223543.
Texto completoSource: Dissertation Abstracts International, Volume: 67-07, Section: B, page: 3514. Adviser: Carl M. Parsons. Includes bibliographical references. Available on microfilm from Pro Quest Information and Learning.
Cárate, Tandalla Dayssy Maritza. "Effects of moderate Nitrogen and Phosphorus addition on the species composition and dynamics of the three seedlings community in tropical montane forests in southern Ecuador". Doctoral thesis, 2015. http://hdl.handle.net/11858/00-1735-0000-002B-7C52-9.
Texto completoChiou, Shih-Jen y 邱世仁. "Investigation of nutrient contents of Aloe vera and effect of additives on nonenzymatic browning of blanched Aloe vera". Thesis, 2003. http://ndltd.ncl.edu.tw/handle/76313615833536356952.
Texto completo靜宜大學
食品營養研究所
92
Abstract The purpose of this study was to investigate the nutritive compositions of the aloe vera and the effects of pH and additives on nonenzymatic browning of blanched aloe vera during storage. In order to establish an optimal blanching processing of aloe vera, the activity changes of peroxidase (POD) and polyphenol oxidase (PPO) of aloe vera were also assayed with different heating treatment. The physicochemical properties of aloe vera studied including vitamins, viscosity, molecular weight distribution, and monosaccharide composition of aloe vera. The results showed that the POD and PPO of aloe vera were inactivated after heating at 100℃ for 4 min. The contents of vitamin C and B1 were significantly decreased after blanching treatment but those of niacin and vitamin B2 differed significantly. The average molecule weight of aloe vera was decreased by heating treatment, resulting in the decomposition of aloe vera polysaccharide. The viscosity of aloe vera also declined with the increase of heating time. The extent of nonenzymatic browning of aloe vera was decreased by reducing pH value during heating. Besides, the extent of nonenzymatic browning of aloe vera significantly decreased with the increased concentrations of thio-compounds added during blanching treatment. Decreasing pH value and increasing of thio-compounds concentration tended to delay the formation of hydroxymethylfurfural (HMF) during storage, where sodium bisulfate gave the most significant effects on inhibiting the formation of HMF, comparing with glutathione and cysteine. According, changing the pH value and adding thio-compounds could efficiently inhibit the degree of nonenzymatic browning of blanched aloe vera during storage.
Onal, Umur. "Development of artificial diets for delivery of water-soluble nutrients to altricial fish larvae". Thesis, 2002. http://hdl.handle.net/1957/30807.
Texto completoGraduation date: 2003
LIN, ZHENG y 林正. "Effects of addition different fiber components to rabbits'diet on growth performance, nutrient digestibilities, hindgut fermentation and intestine structure of domestic rabbits". Thesis, 1992. http://ndltd.ncl.edu.tw/handle/51929991786943128073.
Texto completoMüller, Anke Katrin. "Soil greenhouse gas fluxes under elevated nutrient input along an elevation gradient of tropical montane forests in southern Ecuador". Doctoral thesis, 2014. http://hdl.handle.net/11858/00-1735-0000-0023-9920-3.
Texto completoNgo, Thi Thanh Hue A. "Compost addition and pre-planning soil moisture conditions alter soil nutrients, plant growth and nutrition, and the formation of mycorrhizas". Thesis, 2016. http://hdl.handle.net/2440/114122.
Texto completoComposts are important materials to improve soil fertility. The release of nutrients from composts is affected by soil moisture. Recent work has shown that soil moisture conditions prior to planting can have a profound impact on soil nutrients, plant growth and nutrition, which is defined as the carry-over effect of soil moisture. However, the carry-over effect of soil moisture, especially in compost-amended soils has not been fully investigated. The present research aimed to investigate how soil moisture conditions prior to planting can alter available nutrients in the soil with and without compost addition. Arbuscular mycorrhizal fungi (AMF), which are abundant in the rhizosphere of most terrestrial plants, play an important role in nutrient uptake of plants. Thus, this study also investigated whether the pre-planting moisture conditions and compost addition affect the formation of mycorrhizas. A pot experiment was set up in a glasshouse-controlled condition over 88 days of the experiment. Soil moisture conditions were manipulated as wet (75% of field capacity (FC)), dry (25% FC) and cycle (one wet-dry cycle between 75% and 25% FC) treatments during pre-planting period. Soil moisture then was maintained constantly at 75% FC for all pots during planting period. Tomato and wheat were used as model plants to test potential carry-over effects of compost addition and pre-planting moisture conditions on plants. Overall, the results indicate a clear effect of soil moisture conditions prior to planting on plant growth and nutrition and mycorrhizal colonisation. The N content of plants was clearly associated with N availability in the soil. However, the P content of plants was not correlated with plant-available P in the soil. Tomato and wheat expressed superior growth in the pre-planting dry conditions where mycorrhizal colonisation of roots was also greatest, despite low available N nutrient in the soil at the time of planting. The study suggests that there is a possible synergistic effect of compost and mycorrhizal application in plant growth that needs to be further investigated.
Thesis (M.Bio.(PB)) -- University of Adelaide, Masters of Biotechnology (Plant Biotechnology), School of Agriculture, Food and Wine, 2016.