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1
Zetina, Zoe Taryn Margaux Roberson. "Factors Influencing Potato Production in North Dakota." Thesis, North Dakota State University, 2008. https://hdl.handle.net/10365/29714.
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Spatial shifts and structural changes continue to occur in the United States agricultural industry. Researchers have documented that the potato industry has changed in response to demands of consumers, expectations of producers and improvements in research and development. The aim of this study was to provide empirical evidence that both institutional and infrastructural factors are important to potato production in North Dakota. Using secondary county-level potato production data for North Dakota, an empirical model was designed to estimate the direction and impact of growers' expectations of prices, yields and costs on their decision to produce potatoes. The results confirmed that institutional relationships established between growers and processors, as well as the infrastructure that growers have in place from one growing season to the next, are statistically significant in determining the total number of potato acres planted.
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Nikopoulos, Dimitrios P. "In vitro potato microtuber production." Thesis, University of Bath, 1993. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334729.
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Shakya, J. D. "The production of potatoes from true potato seed by transplanting or field sowing." Thesis, University of Reading, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.354099.
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Lucas, Carlos Krus Galvão. "Biogas production from potato peel waste." Master's thesis, Faculdade de Ciências e Tecnologia, 2014. http://hdl.handle.net/10362/12337.
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Phillips, Scott Lee. "The ecology and epidemiology of potato variety mixtures in organic potato production." Thesis, University of Reading, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.428315.
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Arpiwi, Ni Luh. "The application of novel methods for increasing the yield of small round seed potatoes (Solanum tuberosum L.) varieties Atlantic and Granola." University of Western Australia. School of Plant Biology, 2004. http://theses.library.uwa.edu.au/adt-WU2004.0020.
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Potato (Solanum tuberosum L.) varieties Atlantic and Granola are widely grown in Indonesia. The optimal method of cultivation in the tropics, due to the susceptibility of cut seed for disease, is by small (20 to 55 g) whole seed potatoes. However, the variety Atlantic produces mostly large tubers, which are not suitable for planting as whole seeds. Although Granola produces a reasonable proportion of small tubers it still produces a few in the larger size grades and there is no fresh market in Western Australia for the larger tubers for this variety. The aim of this study was to develop methods to be used in Western Australia that improve the yield of small seed potatoes for export to Indonesia. The influence of seed-potato storage duration (at 4°C) on subsequent stem growth was assessed after 30 days growth in a glasshouse (22°C/18°C, day⁄night). Seed potato storage for 22-28 (Atlantic) and 24-30 (Granola) weeks resulted in development of higher numbers of stems. A series of field experiment were designed to increase yield of small tubers. Apical sprout removal in Granola, but not Atlantic, increased the number of stems (by 27%), yield of 20-55 g potato (by 32%) and total yield (by 17%). Application of herbicide (paraquat + diquat) at low concentration during early tuber initiation decreased total yield in Atlantic (by 14%) and Granola (by 16%). Treating whole seed potatoes with carvone vapor two weeks before planting had no influence on stem or tuber number in both Atlantic and Granola but in Atlantic only, the total yield was reduced by 12%. Spraying plants with paclobutrazol during early tuber initiation inconsistently influenced tuber number and yield between the two varieties and two experiments. The influence of gibberellic acid (GA3) on stem number, total tuber number, yield of 20-55 g tubers and total yield was investigated by dipping seed pieces in a GA3 solution (20 mg⁄L) two days prior to planting. In Atlantic, GA3 treatment increased stem number (by 147%), total tuber number (by 75%) and yield of 20-55 g tubers (by 330%) without influencing total yield. In Granola, GA3 treatment increased stem number (by 50%), total tuber number (by 15%), yield of 20-55 g tubers (by 21%) and total yield (by 10%) The influence of gibberellic acid application (20 mg⁄L) to seed pieces before planting increased the number of small tubers through increased stem number. The shift toward a greater proportion of small tubers, without reducing total yield, had a greater influence in Atlantic than that in Granola. Treatment of GA3 and paclobutrazol together decreased total yield compared to that of GA3 alone
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Tichoux, Henri. "Model comparison of three irrgation systems for potato production in Quebec." Thesis, McGill University, 1999. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=30756.
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The purpose of this thesis is to design a computer model which compares three sprinkler irrigation systems---portable pipe with volume gun, traveller with volume gun and towable/non-towable centre pivot---for potato production. The model user is required to enter a set of basic data: crop and field conditions, irrigation technical parameters and basic economic data, following which the model establishes the preliminary irrigation system and a comparative investment analysis. The model was applied and tested on a potato farm situated in Notre-Dame-de-la-Paix (southwestern Quebec). Based on a 14-year climatic analysis, supplemental irrigation for a normal rainfall growing period (368 mm) was estimated at 250 mm. The application of the model indicates that for a normal rainfall period with an assumed yield increase of 25% over non-irrigated production, all three systems provide net profits (increases of 11% to 50%). However, when determining the Internal Rate of Return (IRR) on a 10-year period, the maximum rate attained by the more profitable systems---portable pipe and non-towable centre pivot (both with an electric pump)---was 14%, a rate inferior to the IRR for non-irrigated production (17%). The Net Present Value (NPV) analysis for the two most profitable irrigation systems provided a slightly higher NPV value for irrigated than for non-irrigated production ($10,942---irrigated vs $10,522---non-irrigated production). The payback period for those two irrigation systems was 7 years. Greater gains of irrigated over non-irrigated yields would be expected for a dry period because of low and unpredictable yields in non-irrigated conditions. A farmer planning to invest in an irrigation system must carefully investigate all technical and socio-economic aspects. The model presented gives the farmer a useful tool with which to do this.
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Leclerc, Yves. "The production and utilization of potato microtubers." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=41512.
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A protocol is presented for the rapid (28 days) induction of microtubers on micropropagated layered potato plantlets of 'Kennebec', 'Russet Burbank' and 'Superior' in medium devoid of growth regulators. With this method the addition of coumarin, 6-(2-chloroethyl)-trimethylammonium chloride and 6-benzylamino-purine to the microtuberization medium either had no effect or significantly reduced microtuber weight per plantlet. Increasing the incubation period from 28 to 56 days significantly increased the weight of microtubers per plantlet and the proportion of microtubers heavier than 1 gram. Increasing the volume of microtuberization medium from 50 to 100 ml significantly increased the number of microtubers per plantlet. Microtuber dormancy periods were cultivar-specific and microtubers $ le$250 mg had longer dormancy periods as compared to microtubers $>$250 mg. A positive correlation was established between endogenous abscisic acid levels and microtuber dormancy periods. Microtubers $ le$250 mg had lower specific gravity, fewer eyes and produce fewer sprouts than microtubers $>$250 mg. Microtuber-derived plants were generally single-stemmed. Severe physiological ageing treatment ($>$2500 degree-days) had no effect on microtuber sprout development, stem number, tuber number and only minimally influenced tuber weight of microtuber-derived plants. Decreasing field in-row planting density from 30 to 10 cm reduced tuber weights and numbers per plant but increased them on a per hectare basis. Economic analysis indicated that optimum planting density varied depending on plantlet cost. The optimum planting density was 10 cm if the cost of the plantlet was $0.10 or less, 20 if plantlet cost were from $0.10 and $0.20 and 30 cm for plantlet cost greater than $0.20. A potato seed tuber certification program adapted to the needs and constraints of Egypt is presented.
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Benz, Jürg Siegfried. "Alternative propagation systems for warm climate potato production /." Zürich, 1989. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=8975.
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Hamidoghli, Yousef. "Production and identification of interspecific potato somatic hybrids." Thesis, University of the West of Scotland, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.283091.
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Manduric, Sanja. "Some potato cyst nematode, Globodera rostochiensis and G. pallida, issues related to Swedish potato production /." Alnarp : Dept. of Crop Science, Swedish Univ. of Agricultural Sciences, 2004. http://epsilon.slu.se/a459-ab.html.
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Beleiciks, Nick John. "The economic impact of potato production and processing in Washington State." Online access for everyone, 2005. http://www.dissertations.wsu.edu/Thesis/Spring2005/n%5Fbeleiciks%5F050305.pdf.
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Sinung-Basuki, Rofik. "Farmer-led experimentation as the basis of new technology development : a case study of TPS technology in Indonesia." Thesis, University of Reading, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387093.
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Satchithanantham, Sanjayan. "Water management effects on potato production and the environment." American Society of Agricultural and Biological Engineers (ASABE), 2012. http://hdl.handle.net/1993/22279.
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Potatoes (Solanum tuberosum) were grown in a fine sandy loam soil in southern Manitoba in a three-year field study comparing four water management treatments: No Drainage with No Irrigation (NDNI), No Drainage with Overhead Irrigation (NDIR), Free Drainage with Overhead Irrigation (FDIR), and Controlled Drainage with Subirrigation (CDSI). The objectives of the study were (i) to evaluate the effect of the four treatments on yield and quality of potatoes, (ii) to evaluate the effect of water management on the environment, (iii) to estimate the shallow groundwater contribution to potato water requirement, and (iv) to simulate the shallow groundwater hydrology using the DRAINMOD and HYDRUS 1-D model. Subsurface drains were installed at 0.9 m depth and at spacings of 15 m (FDIR) and 8 m (CDSI). Subirrigation was done by pumping water back into the tiles through the drainage control structures. Overhead irrigation was carried out using a travelling gun. Water table depth, soil water content, drainage outflow, nutrient concentration in drainage water, irrigation rate, weather variables, potato yield and quality parameters, and biomass were measured. Compared to the NDNI treatment, the potato yield increase in the other treatments ranged between 15-32% in 2011 and 2-14% in 2012. In 2011, potato yield from FDIR was higher than CDSI (p = 0.011) and NDNI (p = 0.001), and yield from NDIR was higher than NDNI (p = 0.034). In 2012, potato yield was higher in FDIR in comparison to NDNI (p = 0.021). In 2012, the NDIR gave higher dark ends (p = 0.008) compared to other treatments. Under dry conditions, up to 92% of the potato crop water demand could be met by shallow groundwater contribution. Compared to free drainage, controlled drainage was able to lower the nitrate export by 98% (p = 0.033) in 2010 and by 67% (p = 0.076) in 2011, and the phosphate export decreased by 94% (p = 0.0117) in 2010. A major part of the drainage flow and nutrient export took place between April and June in southern Manitoba. DRAINMOD was able to accurately predict the shallow groundwater hydrology for this particular research site.
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Tshisola, Steve Ndondji. "Improved potato (Solanum tuberosum) seed production through aeroponics system." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86240.
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Thesis (MScAgric)--Stellenbosch University, 2014.ENGLISH ABSTRACT: The potato can be considered as one of the most important food crops in many African countries. The potential of this crop is reflected in the large increase in area of production where Africa showed the highest rate of growth within the developing world over the past twenty years. The multiplication rate of potatoes is very low compared to other crops. Therefore it is essential to investigate methods of increasing the number of minitubers produced from disease free in-vitro plantlets. There is a number of potato propagation procedures that are currently being used worldwide to multiply seed potatoes. As aeroponics is still a relatively new technique that has not been researched extensively for the production of minitubers, a study relating to the production practises including the nutritional requirements of potato minitubers produced in a aeroponic system were undertaken. Potato plantlets, cv BP1, were grown aeroponically at two different densities (20 and 30 plants/m2) and four harvest intervals (7, 10, 14 and 18 days). The interaction between harvesting intervals and plant densities did not influence plant growth, minituber quality or yield. Best results were realised when harvesting every 7 days with a higher total tuber number over the growing period. Harvest interval also influenced the phosphorus and copper concentration in minitubers. To study the effect of Calcium (Ca) application rate, potato plantlets of cultivars Up-to-date, Mnandi, Buffelspoort and BP1 were grown at four different Ca levels (8.40, 6.75, 5.10 and 3.45 meq/L). The interaction between Ca application levels and cultivars significantly influenced the percentage stolon branching. BP1 had more stolons at the lowest Ca application level and Buffelspoort had more stolons at the full Ca application levels. However, low Ca treatments produced the highest yield. The minituber number and weight harvested were three times more for Mnandi. An aeroponic study on the irrigation frequency (20, 30, 40 and 50 minutes interval) was conducted on four potato cultivars (Up-to-date, Mnandi, Buffelsoort and BP1). Significant differences were noted in the interaction between irrigation frequencies and cultivars for the percentage tuberised plants and stolon and tuber dry mass. When irrigated every 40 minutes, 48% of the Buffelspoort plants produced tubers. Plant height was also significantly affected by the interaction between irrigation frequencies and potato cultivars, with Mnandi producing taller plants when irrigated every 30 minutes. Total tuber number and tuber fresh and dry weight was higher at the irrigation frequency of 20 minutes. The interaction between irrigation frequencies and cultivars on the response to macro and trace elements was not significant for sodium and iron but was for phosphorus, potassium, calcium, zinc and aluminium. A field study was conducted in a greenhouse where potato seed of BP1 obtained from the first trial were graded into different sizes (Small: >20, medium: 20–40 and large: > 40 mm of diameter) and stored at 3 different temperatures (3, 16 and 25oC) for 2 supplementary months before being planted. Sprouting capacity was mostly influenced by temperature regardless of other factors applied to potato seed minitubers such as harvest intervals and sizes. The higher storage temperature of 25oC resulted in tubers with a higher number of sprouts, longer sprouts and with a higher sprouting capacity.
AFRIKAANSE OPSOMMING: Aartappels is een van die belangrikste voedselgewasse in baie lande in Afrika. Die potensiaal van die gewas word gereflekteer in die groot toename in produksie areas, met Afrika wat die vinnigste van al die ontwikkelende lande gegroei het die laaste 20. In vergelyking met ander gewasse is die tempo van planvermeerdering by aartappels baie stadig. Dit is dus essensieel om metodes te ondersoek wat sal help om die aantal miniknolle wat per in vitro plantjie verkry kan word te verhoog. Daar is heelparty plant vermeerderings prosedures wat tans wêreldwyd gebruik word om saad aartappels te vermeerder. Aangesien aeroponika nog steeds ʼn relatiewe nuwe tegniek is wat nog nie ekstensief ondersoek is vir die verbouing van miniknolle nie, is ‘n studie geloods om te kyk na die produksie praktyke, wat insluit die voedingsbehoeftes van aartappel miniknolle in ʼn aeroponika sisteem. Aartappel plantjies, kultivar, BP1, is aeroponies verbou by twee plant digthede (20 en 30 plante/m2) en vier oesintervalle (7, 10, 14 en 18 dae). Die interaksie tussen oesintervalle en plantdigtheid het geen effek gehad op plant groei, miniknol kwaliteit of opbrengs nie. Die beste resultate is verkry waar die knolle elke 7 dae geoes is met ‘n hoër totale aantal knolle oor die groeiseisoen. Die oesinterval het ook ‘n effek gehad op die fosfaat en koper konsentrasie van die miniknolle. Om die effek van die Kalsium (Ca) toedieningspeil te ondersoek is aartappel plantjies; kultivars Up-to-date, Mnandi, Buffelspoort en BP1 gekweek by vier verskillende Ca peile (8.40, 6.75, 5.10 en 3.45 meq/L). Die interaksie tussen Ca toedienings peile en kultivars het ‘n beduidende effek gehad op die persentasie stolon vertakking. BP1 het meer stolons gehad by die laagste Ca toedieningspeil en Buffelspoort het meer stolons gehad by die volle Ca toedieningspeil. Die hoogste opbrengste is egter waargeneem by die laagste Ca toedieningspeil. Die aantal miniknolle en oes massa was drie keer meer vir Mnandi. ‘n Aeroponiese studie op die besproeiingsfrekwensie (20, 30, 40 en 50 minuut intervalle) is gedoen met vier aartappel kultivars (Up-to-date, Mnandi, Buffelsoort en BP1). Beduidende verskille is opgemerk in die interaksie tussen besproeiings frekwensie en kultivars vir die persentasie plante met knolle en stolon en knol droë massa. Met besproeiings elke 40 minute het 48% van die Buffelspoort plante knolle produseer. Plant hoogte is ook beduidend beïnvloed deur die interaksie tussen besproeiingsfrekwensie en aartappel kultivar met Mnandi plante wat hoër was wanneer dit elke 30 minute besproei is. Die totale aantal knolle en knol vars- en droë massa was hoër wanneer daar elke 20 minute besproei is. Die interaksie tussen besproeiings frekwensie en kultivars op die makro- en mikro element inhoud van die knolle was nie beduidend vir natrium en yster nie, maar wel vir fosfaat, kalium, kalsium, sink en aluminium. ‘n Potproef is gedoen in ‘n kweekhuis waar aartappel saad van BP1 verkry vanaf die eerste proef nadat knolle verdeel is in verskillende grootte klasse (klein: < 20mm, medium: 20-40mm en groot: >40mm) en gestoor is by drie verskillende temperature (3, 16 en 25oC) vir 2 addisionele maande voor plant. Spruit ontwikkelings kapasiteit was meestal beïnvloed deur temperatuur ten spyte van ander behandelings soos oes intervalle en knol grootte. Die hoër bergings temperatuur 25oC het aanleiding gegee tot knolle met ‘n hoër aantal spruite, langer spruite en ‘n hoër spruit ontwikkelings kapasiteit.
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Winchester, Adam Miller. "Improving Efficacy of Metribuzin and Rimsulfuron in Potato Production." Thesis, North Dakota State University, 2016. https://hdl.handle.net/10365/27972.
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Rimsulfuron and metribuzin are postemergence herbicides used to control broadleaf weeds in potato and are applied with adjuvants to improve efficacy. Postemergence weed control often coincides with fungicide treatments. Therefore, studies were conducted to determine the effect of adjuvants or fungicides (chlorothalonil or mancozeb) plus metribuzin and rimsulfuron on weed control, potato safety and yield.
Common sunflower and common lambsquarters visual control was ? 91% when metribuzin (420 and 210 g ha-1) plus rimsulfuron (26 and 14 g ha-1) combinations were applied with or without fungicides. Past the four leaf stage, metribuzin (340 g ha-1) and rimsulfuron (21 g ha-1) with adjuvants had no effect on hairy nightshade dry weight. Adjuvants and fungicides did not change yield.
These studies indicate that including fungicides with metribuzin and rimsulfuron reduce weed populations without negatively impacting yield. Additional research is needed to determine the effect of adjuvants with these herbicides on other weeds.
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Dang, Thi Hue. "Supply of affordable high quality potato seed for potato production in the Red River Delta of Vietnam." Thesis, Curtin University, 2008. http://hdl.handle.net/20.500.11937/2415.
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Poor quality seed is the major constraint limiting both the productivity of potato crops and the expansion of the potato industry in Vietnam. Despite numerous attempts to establish a certified seed system, the most practical solution is to import clean foundation seed of the desired variety and physiological age. With imports from Europe and North America proving to be immature and too expensive, Western Australia (WA) has emerged as a potential source of high quality seed. While seed imports from WA are unique in that the varieties imported have been selected by researchers in Vietnam as being suited to the agro-ecological environment in the Red River Delta (RRD), no assessment of the economic benefits to smallholder potato farmers from the use of WA potato seed has been undertaken. In 2006/08, the yield and profitability of three potato varieties Eben, KT3 and Atlantic in two locations were compared where the crops had been derived from new seed imported from WA (VN0), seed derived from crops cultivated in the RRD after one generation (VN1) and two generations (VN2). There was a significant difference in the yield produced between the three different seed sources but not between the locations. For all varieties, and in both years, the yield decreased with the number of multiplications in Vietnam. Furthermore, the marketable yield declined significantly from the first crop (VN0) to the third crop (VN2). The decline in yield and tuber quality with each successive generation was associated with an increase in PVY and PVX infection. Not unexpectedly, differences in yield and marketable yield between the seed generations had a significant impact on the gross income for each variety.VN0 seed of all varieties produced the highest gross income (VND 2.4 to 4.1 M/sao) compared to VN1 (VND 1.9 to 3.1 M/sao) which was significantly higher than VN2 (VND 1.4 to 2.4 M/sao). However, while high quality seed is more productive, it is also more expensive. As a result, significant differences were observed between the seed costs. VN0 seed was almost two times more expensive (VND 10,500 – 11,000 per kg) than VN1 and VN2 seed (VND 6,000 – 6,500 per kg). Despite the higher costs, VN0 seed provided the highest net incomes compared to VN1 which was significantly higher than VN2. Farmers who retained seed received a higher net income (VND 0.13 – 0.6 M/sao) than those who did not retain seed. Ways to improve the accessibility of affordable, high quality potato seed to farmers in the RRD are discussed.
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Dang, Thi Hue. "Supply of affordable high quality potato seed for potato production in the Red River Delta of Vietnam." Curtin University of Technology, Muresk Institute, 2008. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=118348.
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Poor quality seed is the major constraint limiting both the productivity of potato crops and the expansion of the potato industry in Vietnam. Despite numerous attempts to establish a certified seed system, the most practical solution is to import clean foundation seed of the desired variety and physiological age. With imports from Europe and North America proving to be immature and too expensive, Western Australia (WA) has emerged as a potential source of high quality seed. While seed imports from WA are unique in that the varieties imported have been selected by researchers in Vietnam as being suited to the agro-ecological environment in the Red River Delta (RRD), no assessment of the economic benefits to smallholder potato farmers from the use of WA potato seed has been undertaken. In 2006/08, the yield and profitability of three potato varieties Eben, KT3 and Atlantic in two locations were compared where the crops had been derived from new seed imported from WA (VN0), seed derived from crops cultivated in the RRD after one generation (VN1) and two generations (VN2). There was a significant difference in the yield produced between the three different seed sources but not between the locations. For all varieties, and in both years, the yield decreased with the number of multiplications in Vietnam. Furthermore, the marketable yield declined significantly from the first crop (VN0) to the third crop (VN2). The decline in yield and tuber quality with each successive generation was associated with an increase in PVY and PVX infection. Not unexpectedly, differences in yield and marketable yield between the seed generations had a significant impact on the gross income for each variety.VN0 seed of all varieties produced the highest gross income (VND 2.4 to 4.1 M/sao) compared to VN1 (VND 1.9 to 3.1 M/sao) which was significantly higher than VN2 (VND 1.4 to 2.4 M/sao). However, while high quality seed is more productive, it is also more expensive. As a result, significant differences were observed between the seed costs. VN0 seed was almost two times more expensive (VND 10,500 – 11,000 per kg) than VN1 and VN2 seed (VND 6,000 – 6,500 per kg). Despite the higher costs, VN0 seed provided the highest net incomes compared to VN1 which was significantly higher than VN2. Farmers who retained seed received a higher net income (VND 0.13 – 0.6 M/sao) than those who did not retain seed. Ways to improve the accessibility of affordable, high quality potato seed to farmers in the RRD are discussed.
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Batt, Peter. "Building close and long-lasting relationships with focal customers: an empirical study of seed potato purchasing by Filipino potato farmers." Thesis, Curtin University, 2003. http://hdl.handle.net/20.500.11937/171.
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In the highlands of the Northern Philippines, a model of long-term relationships between potato farmers and their preferred seed suppliers is proposed. In the absence of any certified seed system that might provide some guarantee of seed quality, farmers prefer to transact with those seed suppliers with whom they have had some favourable prior experience. Such suppliers provide both the best quality seed and, since most farmers must borrow the capital to purchase the seed, the most favourable terms of repayment. As there is much uncertainty in the exchange, the farmer's relationship with their preferred seed supplier is based on trust. However, since the farmer's satisfaction with the exchange cannot be ascertained until after purchase, trust is antecedent to satisfaction. As satisfaction is derived from the economic benefits the farmer obtains, satisfaction will lead to the farmer's desire to maintain the relationship. Satisfaction is enhanced both by the seed supplier's willingness to extend credit and to provide information. As there is much variation between alternative seed supplier's offer quality, satisfaction will result in the farmer becoming more dependent upon that seed supplier who makes the best offer. Furthermore, having provided the farmer with financial assistance, seed suppliers will find that they have constrained their opportunities to use coercive influence strategies, for in the absence of any formal contract, farmer's may readily default on the loan. The use of coercive influence strategies will reduce both the farmer's trust in their preferred seed supplier and the farmer's desire to maintain the relationship.While trust is more important in the transitional economies, critical problems emerge with the use of standardised item measures and scales developed in the industrial countries. Cultural specific adjustments are necessary to ensure social constructs such a trust are functionally equivalent. However, in the context of long-term relationships where satisfaction is also cumulative, introducing measures of both economic and social satisfaction have the potential to overlap with the generally accepted measures of trust.
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Tichoux, Henri. "Model comparison of three irrigation systems for potato production in Quebec." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0034/MQ64467.pdf.
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Hofvander, Per. "Production of amylopectin and high-amylose starch in separate potato genotypes /." Uppsala : Dept. of Plant Biology and Forest Genetics, Swedish Univ. of Agricultural Sciences, 2004. http://epsilon.slu.se/a495.pdf.
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Schulte-Geldermann, Elmar [Verfasser]. "Management approaches in organic potato and tomato production / Elmar Schulte-Geldermann." Kassel : Universitätsbibliothek Kassel, 2008. http://d-nb.info/1000167593/34.
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Rusendi, Dadi. "Enzymatic hydrolysis of potato processing waste for the production of biopolymers." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=55528.
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Biopolymers are polymers produced by certain microorganisms, that are readily degradable in the environment. These biodegradable plastics have the potential to be used as substitutes for conventional petroleum based plastic provided that the production costs can be greatly reduced. The high cost of biopolymer production is due to the cost of substrate which mainly is glucose.The enzymatic hydrolysis of potato processing wastes was to produce glucose as a least expensive feedstock substrate for the production of biopolymers of polyhydroxybutirate (PHB) from the bacterium Alcaligenes eutrophus was studied. The enzymatic hydrolysis experiments were carried out using $ alpha$-amylase liquefaction enzymes from Aspergillus oryzae and barley-malt, and amyloglucosidase saccharification enzyme from Rhizopus.
The results indicated that the production of glucose from potato starch waste to be used as a substrate to produce biopolymers was both technically and economically feasible. A 10 to 90 ratio of barley-malt to potato starch waste gave the highest conversion of starch to glucose of 194.30 gL$ sp{-1}$ (96.56%), and the lowest liquefaction enzyme cost ($0.054) to hydrolyze one kg of potato starch waste. { it A. eutrophus /} produced PHB of 5.0 gL$ sp-1$ (76.9 % of biomass) using the glucose substrate generated from the potato starch waste.
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Rojas, Jose Santos. "Production and post-harvest technology for hybrid true potato seed (TPS)." Thesis, University of Reading, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363810.
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Ortiz, Oblitas Oscar Ernesto. "The information system for IPM in subsistance potato production in Peru." Thesis, University of Reading, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388581.
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Bingham, Alan. "Stochastic Budgeting and Input Breakeven Analysis in North Dakota Potato Production." Thesis, North Dakota State University, 2017. https://hdl.handle.net/10365/28641.
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Enterprise budgets were developed for non-irrigated red and irrigated russet potato production, based on North Dakota model farms. Costs and revenues vary among producers, thus budgets are intended to serve as a template for producers to use and manipulate to suit their individual circumstances. These budgets and stochastic (Monte Carlo) simulation were utilized in order to analyze and quantify financial risk in each respective enterprise. Simulated net returns for non-irrigated production ranged from -$1,324 to $2,757 per acre, while irrigated returns were between -$551 and $1,616 per acre. On farms where fumigation is a typical practice, it is one of the largest expenses to the enterprise. A break-even analysis was conducted based on market price and possible increases in yield and yield quality. The breakeven curve is downward sloping, as market price increases. Ideal product selection, based on assumed benefits, may vary depending on expected market price.
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Nyende, Aggrey Bernard. "Production, regeneration and field growth of synthetic seeds of the potato /." Göttingen : Cuvillier, 2003. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=010561922&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
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Batt, Peter J. "Building close and long-lasting relationships with focal customers : an empirical study of seed potato purchasing by Filipino potato farmers /." Curtin University of Technology, Muresk Institute, 2003. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=14229.
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In the highlands of the Northern Philippines, a model of long-term relationships between potato farmers and their preferred seed suppliers is proposed. In the absence of any certified seed system that might provide some guarantee of seed quality, farmers prefer to transact with those seed suppliers with whom they have had some favourable prior experience. Such suppliers provide both the best quality seed and, since most farmers must borrow the capital to purchase the seed, the most favourable terms of repayment. As there is much uncertainty in the exchange, the farmer's relationship with their preferred seed supplier is based on trust. However, since the farmer's satisfaction with the exchange cannot be ascertained until after purchase, trust is antecedent to satisfaction. As satisfaction is derived from the economic benefits the farmer obtains, satisfaction will lead to the farmer's desire to maintain the relationship. Satisfaction is enhanced both by the seed supplier's willingness to extend credit and to provide information. As there is much variation between alternative seed supplier's offer quality, satisfaction will result in the farmer becoming more dependent upon that seed supplier who makes the best offer. Furthermore, having provided the farmer with financial assistance, seed suppliers will find that they have constrained their opportunities to use coercive influence strategies, for in the absence of any formal contract, farmer's may readily default on the loan. The use of coercive influence strategies will reduce both the farmer's trust in their preferred seed supplier and the farmer's desire to maintain the relationship.While trust is more important in the transitional economies, critical problems emerge with the use of standardised item measures and scales developed in the industrial countries. Cultural specific adjustments are necessary to ensure social constructs such a trust are functionally equivalent. However, in the context of long-term relationships where satisfaction is also cumulative, introducing measures of both economic and social satisfaction have the potential to overlap with the generally accepted measures of trust.
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Michelson, Gustav, and Sigurd Michelson. "Making production more efficient through modernisation and increased automatization. : A case study at a potato production line." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-264553.
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As labour prices are rising, and automation gets more advanced, it is important for all process industries to get involved with automation to be able to survive on the open market. Large companies in the process industry have been dealing with automation for decades, thereby making the technology more available and affordable. Smaller companies might not have had the financial strength to invest in such technology in the past, but as the equipment needed becomes more user friendly and affordable, the time for smaller companies to invest in automated systems has come. The cost of buying new automated equipment is high, but the systems in use might not be outdated if machine control and monitoring are modernized. Process technology has in many cases not been changed radically over the last decades, so modernizing of older equipment might be a more affordable way to automize production. In this report, installation and testing of both modernizing and used equipment has been done, and the results are quite convincing. Labour costs are reduced by investing a fraction of the cost compared to new equipment. The modernized machines might not be as future proof as newer machines, but it gives companies without the financial strength to invest in new machines the possibility to compete with modern automated production lines. We took a close study at a potato production line at Glomma Potetpakkeri AS, where we installed and tested a robot palletizer. We also discussed possible upgrades with the manager at the plant and calculated some profitability of the possible investments. A conclusion has been made, and in our perspective, a reasonable amount of automation can be achieved without large investments, and the market for these services do exist.I takt med att arbetskraften blir dyrare och automatiseringen utvecklas och blir mer avancerad ökar behovet hos producerande företag att utnyttja automatisering för att kunna överleva på den öppna marknaden. Stora företag inom processindustrin har arbetat med automation i årtionden, vilket gjort tekniken mer tillgänglig och prisvärd. Mindre företag har kanske inte haft den ekonomiska styrkan att investera i sådan teknik tidigare, men eftersom den nödvändiga utrustningen blir mer användarvänlig och prisvärd, har tiden för mindre företag att investera i automatiserade system kommit. Kostnaden för att köpa ny automatiserad utrustning är hög, men ett omodernt system som används idag kan fortfarande vara användbart om maskinstyrning och övervakning moderniseras. Processtekniken har i många fall inte förändrats radikalt under de senaste decennierna, så modernisering av äldre utrustning kan vara en billigare lösning att automatisera produktionen. Under det genomförda projektarbetet har installation och provning av både moderniserings- och begagnad utrustning skett, och resultaten är ganska övertygande. Arbetskostnaderna reduceras samtidigt som investeringen bara kostar en bråkdel jämfört med priset för en ny utrustning. De moderniserade maskinerna kanske inte har lika lång livslängd som nyare maskiner, men det ger företag utan den ekonomiska styrkan att investera i nya maskiner möjligheten att konkurrera med moderna automatiserade produktionslinjer. Vi studerade en potatisproduktionslinje på Glomma Potetpakkeri AS, där vi installerade och testade en robotpalleterare. Vi diskuterade också eventuella uppgraderingar med anläggningschefen och beräknade lönsamheten för de möjliga investeringarna. Slutsatsen som har dragits är att, i vårt perspektiv, en rimlig mängd automatisering kan uppnås utan stora investeringar och marknaden för dessa tjänster existerar.
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Johnson, Alexander Arthur Theodore. "Protoplast Fusion for the Production of Intermonoploid Somatic Hybrids in Cultivated Potato." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/46514.
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Monoploid potato genotypes represent plant material that is free from the "genetic load" of lethal and severely deleterious alleles normally present in the highly heterozygous cultivated potato species. Field evaluations enabled the identification of agronomically superior monoploid potato genotypes from a population of more than 100 anther-derived monoploids. Chemical fusion and electrofusion between pairs selected from 31 superior monoploids resulted in the production of three different groups of intermonoploid somatic hybrids.
The hybridity of somatic hybrid plants and calluses was confirmed through PCR-based amplification of simple sequence repeat (SSR) sequences in the potato genome. Polymorphic SSR loci between the monoploid parents of a particular group of somatic hybrids were used to separate true somatic hybrids (heterozygous at the loci) from parental somaclones regenerating from unfused protoplasts (homozygous for one parental band at the loci).
One group of somatic hybrids (SH1, SH2 and SH2B) was of particular interest because it resulted from the fusion of a S. phureja monoploid to a high acetylleptinidine-producing monoploid derived from an F1 hybrid between S. chacoense and S. phureja. The leptine acetylleptinidine (ALD) is produced only by some accessions of S. chacoense Bitt. and provides resistance to feeding by the Colorado potato beetle (Leptinotarsa decemlineata Say) when present in sufficient concentrations. The somatic hybrids produced moderate levels of ALD in leaves and stems (roughly 60% that of a high ALD-producing S. chacoense clone).
Pollinations of SH1, SH2 and SH2B by several diploid and tetraploid potato clones resulted in three fruit on SH2, one fruit on SH2B and no fruit on SH1. Two resulting progeny populations of SH2 [SH2A = SH2 × S. andigena 8-1 (4x); SH2P = SH2 × S. phureja 66AP11-53 (2x)] expressed higher fertility than the original somatic hybrids and were sexually crossed as both male and female parents to S. tuberosum cv. Atlantic. All of the SH2 progeny populations expressed acetylleptinidines, albeit at lower levels than the SH2 somatic hybrid, providing strong evidence that the genes controlling acetylleptinidine production are dominant. Variation for ALD expression in the SH2 progeny indicated one or a few genes with additive effect controlling the ALD trait. In addition, the choice of male parent in sexual crosses to SH2 affected subsequent ALD expression in progeny populations. The SH2 progeny represent an important first step towards transferring acetylleptinidines to cultivated potato.
SH1, SH2 and SH2B appeared to be negatively affected by an unusually high ploidy (hexaploid, 6x). Field-grown plants produced many tubers (mean = 35) of low weight (mean = 10.4 g) and were stunted in appearance. Anther culture of SH2 yielded triploid regenerants (3x). These regenerants may be more phenotypically normal than the original somatic hybrids because of lower ploidy. Segregation of SSR alleles in the triploid anther culture regenerants provided evidence that the hexaploid somatic hybrid SH2 genome is comprised of four homologous genomes of CP2-103 (the high leptine-producing monoploid) and two homologous genomes of 13-14 203 (the S. phureja monoploid).Master of Science
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Dresow, Jana Franziska [Verfasser]. "Optimization of organic potato production : influence of agronomical measures on yield and quality of table potatoes and processing potatoes / Jana Franziska Dresow." Kassel : Universitätsbibliothek Kassel, 2013. http://d-nb.info/1046188526/34.
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Yoon, Kab Seog. "Investigations of a two-step process for potato (Solanum tuberosum L.) microtuber production." Thesis, University of Canterbury. Botany, 2000. http://hdl.handle.net/10092/6561.
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Standard protocols for potato plantlet multiplication from nodal explants and for subsequent microtuberization were established. Liquid Murashige and Skoog (1962) basal media containing 3% (w/v) or 8% (w/v) sucrose without any exogenous plant growth regulators were used for plantlet multiplication or microtuberization respectively. More than 20 variations to the standard protocols, either during the plantlet multiplication step or the microtuberization step were investigated in relation to plantlet growth, microtuber number, average fresh microtuber weight and microtuber weight distribution. The responses of two potato cultivars ('Iwa' and 'Daeji') were compared. Time courses of some major changes in the media were also studied.
Initially, it was found that sucrose disappearance from the standard microtuberization medium, microtuber initiation, development and cessation of further growth, invertase activity development in the medium, osmotic potential changes and pH changes in the medium appeared to be correlative events. However, the data from the different experiments in this study indicate that most of these changes are associated with the 8% sucrose medium but are not strictly related to microtuberization. Among the 21 variations to the standard protocols, whether during plantlet multiplication or during in vitro tuberization, medium replacement was most effective in inducing the formation of bigger and more microtubers.
In the course of this study, it was observed that at the end of the plantlet multiplication step the root had turned green. Even more interesting is that some of these green roots remained green after 10 weeks in darkness for the microtuberization step. A small-scale ultrastructural study confirms the occurrence of chloroplasts in the green roots during plantlet growth and also at the end of the microtuberization step in the dark.
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Worthington, Christine Maria. "Timing of climatic factors that may influence potato yield, quality, and potential nitrogen losses in a northeast Florida seepage-irrigated potato production system." [Gainesville, Fla.] : University of Florida, 2006. http://purl.fcla.edu/fcla/etd/UFE0015765.
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Santos, Joana. "Effects of fertility management and natural foliar sprays on late blight (Phytophthora infestans), potato yield and tuber quality in organic potato production systems." Thesis, University of Newcastle Upon Tyne, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.433142.
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Dhliwayo, Tererayi. "Alternative products in the inhibition of te plant pathogen scleroyinia sclerotiorum on potato production." Thesis, Nelson Mandela Metropolitan University, 2008. http://hdl.handle.net/10948/941.
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White mold caused by Sclerotinia sclerotiorum attacks a wide host range of broad-leafed plants which includes potatoes. Current control is limited to the use of chemicals, but biological control has emerged as an eco-friendly alternative. For the study, 19 bacterial strains and 18 fungal strains obtained from soil samples taken from a potato field naturally infested with the pathogen S. sclerotiorum were tested for the effects on S. sclerotiorum mycelium growth and sclerotia viability in vitro. A total of eight bacterial strains and six fungal strains proved to be effective in the inhibition of S. sclerotiorum mycelium growth on PDA plate using a dual culture technique. These antagonistic microbes were six Bacillus subtilis, Bacillus pumilis, Bacillus marisflavi, Fusarium solani, Fusarium equiseti, Fusarium chlamydosporum, Aspergillus niger, Aspergillus insuetus and Penicillium citrinum. There was a significant difference (p<0.05) in the interaction between S. sclerotiorum mycelium growth and the time after inoculation with a S. sclerotiorum mycelium plug for both bacterial and fungal soil isolates. An additional sclerotia viability test was carried out using four of the eight antagonistic bacteria, and six of the antagonistic fungi. The results showed that two Bacillus species, namely B. pumilis and B. marisflavi can effectively reduce sclerotia viability. The other two bacteria (both B. subtilis), recorded low percentage reduction in sclerotia viability. As for the six antagonistic fungi, the viability test proved to be less effective in determining sclerotia viability. However, the result of this study supports the use of bio-control agents, not only because they are environmentally friendly, but because they are also an effective way of controlling the plant pathogen, S. sclerotiorum.
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Junqueira, Ana Maria Resende. "Irrigation management and economies of seed potato (Solanum tuberosum L.) production in central Brazil." Thesis, Bangor University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387129.
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October, John Reginald Vernon. "Seaweed extract effects on potato (Solanum Tuberosum 'BP1') and grape (Vitis Vinifera Var. Sultana) Production." University of the Western Cape, 2017. http://hdl.handle.net/11394/5938.
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Philosophiae Doctor - PhD (Biodiversity and Conservation Biology)Field trials were conducted to determine the effects of a locally produced seaweed extract product (Afrikelp LG-1), on the growth parameters and yield of Solanum tuberosum 'BP1'potato crop and Vitis vinifera var. sultana grapes. The extrapolation of these results will assist local potato and grape farmers to produce quality crops with improved yields. Field experiments were conducted at the Agricultural Research Council (ARC) Nietvoorbij site in Stellenbosch, South Africa. The experimental layout consisted of four randomised blocks, and four replicates were used per treatment. Various concentrations of seaweed extracts (0, 2, 3, 4, 5, 6, and 7 l/ha) was applied as soil drench and foliar sprays over two cropping seasons, namely 2010 and 2011 (potato), and 2011 and 2012 (sultana grapes).
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Dunbar, Christopher Lloyd. "Utilization of seaweed extract and plant growth promoting rhizobacterium in greenhouse production of potato minitubers." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq24962.pdf.
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Samarasinghe, P. W. S. Mallika. "The production of seed potato (Solanum tuberosum L.) tubers from stem cuttings in Sri Lanka." Thesis, University of Newcastle Upon Tyne, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309402.
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Belt, Rodriguez Tamara Claudia. "Agricultural modernisation in Colombia 1936-1990 : markets, institutions and technology in sugar, banana and potato production." Thesis, London School of Economics and Political Science (University of London), 1995. http://etheses.lse.ac.uk/2840/.
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This study analyses the factors associated with rural modernisation between 1936 and 1990 and places them in an international context. It focuses on the production of three commodities-sugar, bananas and potatoes. The approach departs from orthodox neo-classical analysis, which maintains that markets are the central agency responsible for change, and argues that institutions, the nature of the crop, technology, labour and land tenure as well as markets determined the path of agrarian transformation. This argument is sustained by considering scale- and capital-bias in agrarian technology, patterns of land usage and the changing role of labour in the productive process. The three commodities studied are regionally specific, sugar in the Cauca Valley, bananas in the Magdalena Valley and the Gulf of Uraba and potatoes in the departments of Boyaca and Cundinamarca. Developments within these regions are presented with reference to appropriate national and international trends. For the sugarmill owner, informal institutions and political links assisted in obtaining machinery and inputs. For the banana exporter, links with international markets and capital availability allowed them quickly to establish production and trade. For potato growers, private local initiative and indirect state programmes fostered development. With bananas and sugarcane most changes to the productive process were labour and land saving. Nonetheless, labour remained an important aspect of cultivation and harvesting and some methods reverted to more labour intensive production with the passage of time. Moreover, low-cost techniques played an important role for all three crops throughout the modernisation process. The research proves that though relative prices have an influence on production, existing land usage structures, institutional arrangements, technical change absorbtion, and capital-bias distorted market prices and resulted in paths to modernisation that were less than optimal.
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Bhatti, Muhammad H. "Somatic embryogenesis in sweet potato (Ipomoea batatas L.) in relation to cryopreservation and synthetic seed production." Thesis, University of Bath, 1997. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362256.
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Lowe, Robert 1961. "In vitro hardening, improved greenhouse minituber production and field performance of potato (Solanum tuberosum L.) cv. Norland." Thesis, McGill University, 1999. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=21598.
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Micropropagated potato (Solanum tuberosum L.) plantlets are routinely used for producing specific pathogen tested minitubers in the Canadian seed tuber certification industry. In vitro hardening methods for micropropagated 'Norland' were investigated, involving full and half strength Murashige and Skoog (1962) based propagation medium supplemented with NaCl, KCl, CaCl2, polyethyleneglycol, or paclobutrazol. Ten different media treatments were compared for their effect on stomatal function and early transplant performance using porometry, microscopy, and direct ex vitro transplanting. PEG, NaCl and 1/2 MS + 3 mM Ca treatments did lead to decreased leaf water losses. However, these treatments did not improve ex vitro transplant performance compared to controls. Minituber production was investigated using ex vitro plantlets in a rockwool-based hydroponic system. Productivity was evaluated for treatments involving photoperiod pretreatment, planting orientation, planting density, and hilling. No difference in total yield was detected when plantlets were exposed to 12 compared with 16 hour photoperiod pretreatments. However, short photoperiod pretreatment increased the number of minitubers in the most desirable size range. Increased planting density reduced yield per plant. However, small increases in yield per m2 occurred with increased planting density. Hilling, pinching, and planting orientation had no effect upon minituber size, number, or overall fresh weight yield. Significant differences in minituber yield occurred in field experiments. Larger minitubers (10--40 g) had larger yields compared with smaller minitubers (1--5 g). These results will contribute to improved minituber production technology for the Canadian certified potato seed tuber industry.
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Stevens, Paul Thomas. "Nitrogen Management and the Effects of Compost Tea on Organic Irish Potato and Sweet Corn." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/33418.
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Supply and synchronization of plant-available nitrogen (N) to the soil is a major challenge for organic farmers, especially when growing crops in soils that are in transition from conventional to organic systems. This research evaluated the effects of site produced cover crops and application of soil amendments on N uptake and crop yield of organic Irish potato (Solanum tuberosum) and sweet corn (Zea mays). Cover crops were crimson clover (Trifolium incarnatum) and forage radish (Raphanus sativus). Soil amendments included in-row application of commercially produced dehydrated compost tea absorbed on charcoal (Soil Biology Innovations) and post-plant sidedressing with organic N fertilizer. Irish potato and sweet corn were grown at the Kentland Agricultural Research Farm near Blacksburg, VA in an organic transition soil during the summers of 2006 and 2007. Nitrogen uptake and crop yield were not affected by cover crop species in either year. SBI increased yield of sweet corn, but not Irish potato for both years; SBI had no effect on N uptake of either crop. Post-plant N sidedressing increased N uptake and crop yield of Irish potato and sweet corn in 2007, but had no effect on crop yield in 2006, presumably because pre-plant organic fertilizer was applied at planting in 2006, but not in 2007. This study shows that the combination of site produced cover crops and applied soil amendments may be required to produce high marketable yields of organic Irish potato and sweet corn in the transition soil used in these experiments.Master of Science
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Lowe, Robert. "In vitro hardening, improved greenhouse minituber production and field performance of potato, Solanum tuberosum L., cv. Norland." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ50825.pdf.
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Palumbo, Rose. "The Potential for Green Fluorescent Protein as a Screening Tool in the Production of Haploid Potato Plants." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/9651.
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A hybrid between a highly regenerative diploid clone (BARD 1-3) of Solanum phureja and haploid inducer IVP 101 was transformed with Agrobacterium tumefaciens strain 4404 containing plasmid pHB2892 with genes for green florescent protein (GFP) and kanamycin resistance. Hemizygous primary transformants (To) were produced from three leaf discs: 17 diploid plants from one leaf disc, three and nine tetraploids from the other two leaf discs. GFP expression was observed qualitatively under fluorescence microscopes and quantitatively with a GFP meter. Anther culture of tetraploids produced 29 plants, none with high levels of GFP. Segregation ratios for tetraploid T1 seedlings fit models for single duplex insertions (35 transgenic: 1 non) or double simplex insertions (15 transgenic: 1 non). Diploid T1 seedlings segregated for deleterious traits: dwarfed size and curled leaves, as well as the GFP transgene. Similar segregation patterns in diploid families implied that all diploids may have been from the same transformation event. The cumulative segregation showed the dwarfed and curled plants fit a single recessive gene ratio (3 normal: 1 mutant), and GFP fit a double-copy insertion ratio (15 transgenic: 1 non). There was substantial GFP silencing evidenced by the loss of expression in plants that had originally been selected for high GFP. However, six selections were found to be free of deleterious traits, consistently high expressers of GFP, and producers of stainable pollen with less 2n than IVP 101.Master of Science
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Juntharathep, Pintip. "Effect of varietal resistance, copper fungicides and agronomic practices on late blight (Phytophthora infestans), potato yield and tuber quality characteristics and soil Cu levels in organic potato production systems." Thesis, University of Newcastle Upon Tyne, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.413019.
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Fernandez, Silvia. "Study of conidia production and transmission of beauverza bassiana (balsamo) vuill. in Colorado potato beetle (leptinotarsa decemlinea ta)." Fogler Library, University of Maine, 2001. http://www.library.umaine.edu/theses/pdf/FernandezS2001.pdf.
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Tiessen, Kevin. "Measurement and modelling of tillage and water erosion within intensive potato production systems of northwestern New Brunswick, Canada." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66791.
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In Canada, there is growing acceptance that tillage erosion is a serious form of soil degradation and a threat to the sustainability of agriculture across the country. To date, the potential for tillage erosion within potato (Solanum tuberosum L.) production systems has not been investigated. To address this issue, field experiments were conducted in northwestern New Brunswick to generate tillage translocation and erosivity values for primary, secondary and "tertiary" (i.e., field operations conducted during planting, hilling and harvesting) tillage implements commonly used for potato production. The potential for tillage erosion was equally high for the mouldboard plough, chisel plough and offset disc, and larger than that for the vibrashank. Surprisingly, tertiary field operations moved soil further and were more erosive than primary and secondary tillage operations, alone or combined. Overall, the risk of tillage erosion during the production of potatoes is considerably greater than that for other major cropping systems in Canada. Water erosion is also a serious problem within the potato producing regions of Atlantic Canada. However, to date, no previous studies have looked at the impact of both tillage and water erosion on total soil erosion within potato production. Using repeated-measurements of the fallout radionuclide cesium-137 (137Cs), annual soil losses between 1990 and 2005 at a New Brunswick benchmark site were 13.6 Mg ha-1 yr-1, with approximately half of the mapped field having soil losses greater than the tolerable soil loss limit of 6 Mg ha-1 yr-1. A new Directional Tillage Erosion Model (DirTillEM) was used to account for the apparent effect of tillage direction and field boundaries on soil redistribution at this field site. Overall, DirTillEM predictions improved relationships between 137Cs redistribution and estimated soil erosion over those determined by two previously published wateAu Canada, il est maintenant admis que l'érosion par le travail du sol est une forme importante de dégradation du sol et une menace à la viabilité de l'agriculture dans tout le pays. Jusqu'à présent, le potentiel de l'érosion par le travail du sol dans la culture de la pomme-de-terre (Solanum tuberosum L.) n'a pas été étudié. A cette fin, des expériences au champ ont été menées dans le nord-ouest du Nouveau-Brunswick afin de produire des valeurs pour la translocation du sol ainsi que pour l'érosivité des équipements utilisés au cours des travaux du sol primaire, secondaire et "tertiaire" (c.-à-d., les opérations de plantation, buttage et de récolte) pour la culture de la pomme-de-terre. Le potentiel de l'érosion par le travail du sol était semblablement élevé pour la charrue à versoirs, le chisel et le pulvériseur offset, mais moins élevé pour le vibroculteur. Etonnamment, les opérations tertiaires ont déplacé le sol plus loin et étaient plus érosives que les opérations primaire ou secondaire, seules ou combinées. Dans l'ensemble, le risque de l'érosion par le travail du sol dans la culture de la pomme-de-terre est considérablement plus important que pour les autres systèmes culturaux typiques du Canada. L'érosion par l'eau est également un problème d'envergure dans les régions de production de la pomme-de-terre du Canada atlantique. Cependant, aucune étude antérieure ne s'est penchée sur l'impact combiné de l'érosion par le travail du sol et par l'eau dans cette culture. Des mesures répétées des retombées radioactives de césium-137 (137Cs) ont révélé des pertes de sol annuelles de 13.6 Mg ha-1 an-1 entre 1990 et 2005 à un site de référence au Nouveau-Brunswick, avec environ la moitié des endroits échantillonnés ayant des pertes au delà du seuil tolérable de 6 Mg ha-1 an-1. Un nouveau modèle, le Directional Tillage Erosion Model (DirTillEM
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Sebastiani-Kuoko, Stephen. "Potato production systems in the northern highlands of Tanzania : a study of the yield potential and associated constraints." Thesis, University of Reading, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242125.
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Demagante, Antonia L. "Potato production in the hot lowland tropics : effects of water stress on the growth and yield of diverse genotypes." Thesis, University of Reading, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293228.
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