Dissertations / Theses on the topic 'Leafy vegetable'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'Leafy vegetable.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
Mahlangu, Sandile Alexandra. "Production and commercialisation potential of indigenous leafy vegetables : case study of Capricorn District in the Limpopo Province, South Africa." Thesis, University of Limpopo, 2014. http://hdl.handle.net/10386/1332.
Full textThere are few plant species commercialised significantly globally and food requirements are mainly met by only few species. However, there is an enormous number of under-utilised species that play a vital role in the livelihood of rural households. These species are referred to as indigenous crops. Indigenous crops are adaptable to local agro-ecological conditions even where there is unreliable rainfall, which is the case in many parts of the country, require a minimum production management, mature early, and are easy to harvest and preserve and require less capital investments. Despite all these, in South Africa indigenous leafy vegetables (ILVs) were not commercialised and most researchers did not pay much attention to do research on possibilities of commercialising these crops. Thus this study investigated the economic potential of commercialising indigenous leafy vegetables in the rural South African context in general and in the study area in particular. The objectives of the study were (1) to identify the socio-economic characteristics of ILVs producers in rural areas of Capricorn district, (2), to investigate constraints faced by farmers in commercialising ILVs in rural areas of Capricorn district, (3), to determine the productivity of indigenous leafy vegetables in rural areas of Capricorn district, and (4), to assess different types of marketing channels of ILVs in rural areas of Capricorn district. The study used Stochastic Frontier Production Function to determine the productivity and to assess the socio-economic characteristics of producers of Indigenous Leafy Vegetables. Bubble chart was used to assess the marketing channels whilst consumer data was captured into a statistical package. The results indicated that there are several significant socio-economic factors that affect ILV production and there are also factors which constraint farmers from commercialising ILVs. Productivity of ILVs in the study area varied a lot among farmers; some farmers had a high productivity but most farmers had a low productivity. The results indicated that out of the factors included in the analysis significant production factors were; amount of labour used, cost of hiring tractor service and land devoted to ILVs and inefficiency factors were; gender, age, household size, farming experience, farm size, v hired labour, primary occupation and land ownership. ILV farmers had no formal marketing channels; they sold their product direct to consumers or through hawkers. Therefore, the study recommends the integration of science/modern technology and indigenous knowledge, to improve the productivity of ILVs. Since farmers were not technically efficient, therefore it is important to run workshops that will help them improve their production and marketing skills and how to market their products. Or create booklets that have information on how to efficiently produce ILVs. There should also be awareness campaign on the benefit of ILVs in both rural and urban communities. The study also recommends a multi-disciplinary approach in developing the crop; more stakeholders should be involved so as to make the crop appealing. Finally the study recommends the commercialisation of these crops due to the fact that they have the potential and are demanded in most parts of South Africa.
DeNiro, Julia L. "Airborne Transport of Foodborne Pathogens from Bovine Manure to Vegetable Surfaces." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1376925440.
Full textFu, J. "Effects of different harvest start times on leafy vegetables (Lettuce, Pak Choi and Rocket) in a reaping and regrowth system." Lincoln University, 2008. http://hdl.handle.net/10182/670.
Full textAnele, Mayekiso. "Production of Indigenous Leafy Vegetables (ILVs) and their contribution to household food security: evidence from Coffee Bay, Eastern Cape Province of South Africa." Thesis, University of Fort Hare, 2016. http://hdl.handle.net/10353/712.
Full textSriwichai, Wichien. "Déterminants de la bioaccessibilité des caroténoïdes et tocophérols de légumes feuilles : comparaison variétale et influence du procédé." Thesis, Montpellier, 2016. http://www.theses.fr/2016MONTT176.
Full textThe vitamin A deficiency is a major public health problem in numerous countries and affects specifically vulnerable groups. A diversified diet allows decreasing the vitamin A deficiency in a sustainable way. Fruits and vegetables have an important role to play in this context. Some of provitamin A carotenoids can fulfil human vitamin A requirements. Their poor intestinal absorption and bioconversion into vitamin A is a limiting factor. This thesis aim at, firstly, identify the key determinants of carotenoid (β-carotene and lutein) and α-tocopherol bioaccessibility in 8 fresh leafy vegetables consumed in South East Asia. Their nutritional profile and capacity to liberate micronutrient throughout in vitro digestion were assessed. Statistical correlations were determined among the variables to identify which factor promotes or impairs the micronutrient bioaccessibility. In a second step, two studies were leaded on chayote and moringa leaves to evaluate the influence of culinary treatments and preservation methods on the compound bioaccessibility. A microscopical approach was used to assess the structural changes of the food at the cellular scale. Finally, a quantification method of pectins and tannins in the digestive medium was developed to highlight their role in the carotenoid micellarisation. Leafy vegetables are constituted of tree distinct tissues (epidermis, mesophylle and vascular bundles). The pectin contents in leafy vegetable were the only key factor statically involved in the carotenoid micellarisation. The analysis of the pectin contents of the digestive medium of leafy vegetable did not confirm this hypothesis. The condensed tannins had rather a protective role probably related to their antioxidant properties. Among the culinary treatments, steaming increased greatly the carotenoid and α-tocopherol bioaccessibility with concomitant tissue disorganization and low degradation reactions. On the contrary, frying destroys the epidermis layer, opens some palissadic cells with a high level of destruction of vitamins with the high temperature used. Drying at moderate temperature (60°C) plus grinding produce powders with high release of compounds during in vitro digestion. In conclusion, fresh and processed vegetables have an interesting nutritional profile and processing (drying/grinding, steaming, sterilization) improves the digestive release of micronutrients. Cell opening is an important factor as well as the biochemical composition of the leaves which determine the digestive behaviour (stability, micellarisation). Stabilisation of leaves by drying and grinding allow delivering functionalised powder during the year. Moringa has a nutritional profile comparable to others leafy vegetables except for its phenolic contents. The consumption of diversified products based on leafy vegetables in fresh or processed state should improve the nutritional status of populations
Jansen, van Rensburg WS, Averbeke W. Vab, R. Slabbert, M. Faber, Jaarsveld P. Van, Heerden I. Van, F. Wenhold, and A. Oelofse. "African leafy vegetables in South Africa." Water SA, 2007. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1000817.
Full textAmoussa, Hounkpatin Waliou B. A. "Évaluation du potentiel de couverture des besoins en vitamine A des jeunes enfants à partir des sauces accompagnant les aliments de base consommés au Bénin." Thesis, Montpellier 2, 2011. http://www.theses.fr/2011MON20160/document.
Full textThe identification and the improvement of the potential in pro-vitamins A of sauces accompanying staple foods could constitute a food-based approach for combating vitamin A deficiency (VAD) among young children in Benin. The nutritional quality and the retention of pro-vitamins A in sauces during traditional home processing has been assessed by using a field-laboratory iterative approach. Anthropometric measurements were used to appreciate subjects' nutritional status. A food consumption survey of 420 young children was conducted to assess the adequacy of iron, zinc and vitamin A (VA) intakes, and to identify the main VA-rich foods eaten by children using the weighed food record method. Mangoes, eggs, red palm oil (RPO), various leafy vegetables (LV) and palm nut juice sauces appeared to be the main VA-rich foods consumed by 34.2% investigated children. When consumed, these LV sauces containing RPO or palm nut juice (PNJ) contributed to the meeting of 71-129% of the recommended VA intake of young children. The traditional processing method of the most promising sauces such as amaranth leaf sauces based on RPO or PNJ was monitored step by step during home visits and allowed identifying the thermal treatments applied to LV, to palm nut or to RPO as critical steps. Heating the RPO at 180-200°C appears as the more prejudicial step to VA. It decreased more than 70% and in less than 3 min, α-carotene, β-carotene and Retinol Activity Equivalent (RAE) contents. Violaxanthin, a non pro-VA carotenoid, was the only compound to be significantly affected by the thermal treatment (100°C) of amaranth leaves. RAE remained high after blanching even when alkaline traditional potash was added. The formulated sauces on the basis of the ingredients LV-amaranth, palm nut or RPO present a good acceptability, a high RAE and their consumption could be promoted favorably in food-based strategies to alleviate VAD
Palumbo, John. "Management of Aphids and Thrips on Leafy Vegetables." College of Agriculture, University of Arizona (Tucson, AZ), 1999. http://hdl.handle.net/10150/221610.
Full textMatheron, Michael E., and Martin Porchas. "Performance of Products for Management of Sclerotinia Leaf Drop of Lettuce in 2002." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2002. http://hdl.handle.net/10150/214955.
Full textTengku, Muda Mohamed Mahmud. "Acclimation of leafy vegetables for post-harvest quality retention." Thesis, University of Nottingham, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308305.
Full textCroft, Marcia M. "The role of African leafy vegetables in food security." Thesis, Purdue University, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10245801.
Full textAfrican leafy vegetables (ALVs) are a diverse set of crops grown across sub-Saharan Africa. They have been a staple of traditional diets and contain many critical micronutrients but their importance has been largely ignored by researchers and policymakers at the expense of imported crops. Availability, accessibility, and utilization of ALVs are limited by factors across the supply chain. This research investigated seed systems, drought tolerance, hydroponic production, market barriers, consumer preference, and the impact of gender as related to ALVs. We found that ALVs play an important role in food security and that critical differences exist between formal and informal sectors. Women play a stronger role in informal sectors, but the balance between the formal and informal markets is changing, and this may jeopardize the incomes of many women. The determinants of household security were different for male- and female-headed households, and this information can be used to address the gap in food security between genders. Market barriers differed for formal and informal ALV retailers but consumer preference for quality did not, suggesting that investment in postharvest handling may allow ALV growers to capture greater value. We also showed that ALV germplasm is diverse, offering both a wide range of species with different agronomic characteristics and important differences in drought tolerance among accessions. Crop- and location-specific factors impacted farmer adoption of seeds and technologies, highlighting the importance of evaluating policies and interventions with sensitivity to gender, species, and location. ALVs can be used to empower marginalized populations, and this research proposes several ways to do so. However, the market for ALVs is changing rapidly, and future research is needed to monitor trends and assure that these vegetables are used to increase social equality rather than aggravate existing disparities. Promoting savings groups and capital accessibility can help to build this capacity, especially for women. Overall, this research revealed that a wide diversity of under-studied ALV species is contributing to food security in important ways and that the potential exists to strengthen production, distribution chains, and markets further. Well-targeted research and investment could have a substantial impact in this area in improving sustainability and food security for people across sub-Saharan Africa.
Hui, Ming-leung, and 許明亮. "Livestock waste and sewage sludge for growing local leafy vegetables." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1996. http://hub.hku.hk/bib/B31214137.
Full textIbrahim, Faozia. "Interaction of bacteria with growing salad vegetables and leafy herbs." Thesis, University of Nottingham, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.416288.
Full textIlic, Sanja. "Post-harvest Interventions and Food Safety of Leafy Green Vegetables." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1313509920.
Full textHui, Ming-leung. "Livestock waste and sewage sludge for growing local leafy vegetables /." Hong Kong : University of Hong Kong, 1996. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19667395.
Full textVelez, Rivera Edwin. "A review of chemical disinfection methods for minimally processed leafy vegetables." Thesis, Manhattan, Kan. : Kansas State University, 2005. http://hdl.handle.net/2097/103.
Full textBélanger, Julie. "Green leafy vegetables of rural India: ethnobotany and contribution to eye health." Thesis, McGill University, 2010. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=92338.
Full textAfin de reconnaître la contribution de la biodiversité à la santé humaine, de solides preuves scientifiques additionnelles sont requises. D'autre part, la nature multifactorielle de cette relation nécessite l'élaboration de cadres de recherche innovateurs. Ce mémoire présente une étude de cas multidisciplinaire sur la contribution d'éléments de la biodiversité, en particulier les légumes feuillus cultivés et sauvages, en relation avec la prévention de la cataracte liée à l'âge dans le contexte rural de l'Inde du Sud. Au coeur de ce projet, une étude ethnobotanique a permis d'identifier les facteurs déterminant la consommation de légumes feuillus, et de démontrer l'influence significative des propriétés qui leur sont attribuées et de leur statut de culture sur les habitudes de consommation. Les espèces analysées par chromatographie en phase liquide à haute performance ont affiché d'importantes concentrations de lutéine et de β-carotène. Se basant sur ces données ethnobotaniques et analytiques, une étude cas témoin a été conduite dans un centre d'ophtalmologie afin de comparer la consommation de légumes feuillus, en quantité et en diversité, et de lutéine et zéaxanthine, chez des patientes diagnostiquées et des témoins sains. Des associations contradictoires concernant la consommation de légumes feuillus et le risque de cataracte ont été observées. En revanche, certains aliments traditionnels, comme le yaourt et le thé, ont démontré une association négative avec la cataracte. L'intégration de ces études à l'intérieur d'un cadre multidisciplinaire a permis de tenir compte des relations complexes entre les composantes biologiques, socio-économiques et environnementales de la santé de l'oeil et de la diversité botanique, permettant ainsi la découverte d'importantes connaissances applicables à la prévention de la cataracte chez des populations à risque. fr
Osei, Jennifer. "Potential contribution of African leafy vegetables to the nutritional status of children / J. Osei." Thesis, North-West University, 2012. http://hdl.handle.net/10394/9191.
Full textThesis (MSc (Nutrition))--North-West University, Potchefstroom Campus, 2013.
Rodríguez-Casas, Julio. "Response of leafy winter vegetables to water and nitrogen inputs under subsurface trickle irrigation." Diss., The University of Arizona, 1994. http://hdl.handle.net/10150/186683.
Full textPalumbo, John C., Andreas Amaya, Luis Ledesma, Leonardo Chavez, Javier Ruiz, and Geraldo Villegas. "Foliar Activity of Assail®, Fulfill® and Flonicamid® on Aphids in Leafy Vegetables." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2004. http://hdl.handle.net/10150/215229.
Full textVorster, Halina Johanna. "The role and production of traditional leafy vegetables in three rural communities in South Africa." Pretoria : [s.n.], 2008. http://upetd.up.ac.za/thesis/available/etd-02122009-115129/.
Full textDlamini, Vukile Vinah. "Adult women in Eluyengweni Swaziland : their food practices and knowledge of indigenous green leafy vegetables." Diss., University of Pretoria, 2017. http://hdl.handle.net/2263/60802.
Full textDaar is 'n besorgdheid oor die afname in kennis in die gebruik van inheemse groen blaargroentes in baie streke in Suider Afrika, insluitend Swaziland. Redes wat hiervoor aangevoer word, is onder andere, die gebrekkige oordrag van kennis van een geslag na die volgende, die invloed van verwestering asook 'n verandering in waardes en houdings aangesien mense inheemse groen blaargroentes deesdae as 'n lae status voedsel beskou. Daarom is dit noodsaaklik dat kennis oor hierdie voedsel gedokumenteer word voordat dit verlore gaan vir die nageslag. Inheemse groen blaargroentes word gesonder geag in vergelyking met Westers-georienteerde voedsel, wat op hul beurt nou geassosieer word met kroniese lewenstyl siektes. Die doel van hierdie studie was om die kennis van inheemse groen blaargroentes van twee geslagte landelike Swazi vroue van die Eluyengweni gemeenskap te bepaal, beskryf en te vergelyk asook hoe dit manifesteer in hul voedselpraktyke. Studies oor inheemse groen blaargroentes in Swaziland is beperk en hierdie studie dra by om die leemte in kennis in hierdie studieveld te vul. Die menslike ekologiese perspektief is a teoretiese perspektief gebruik en 'n verkennende gemengde metodologie is as navorsingsbenadering gevolg. Kwalitatiewe data is deur middle van fokusgroep gesprekke met beide die jonger (25-45 jaar) en ouer (ouer as 45 jaar) vroue ingesamel. Met behulp van gestruktureerde individuele onderhoude is kwantitatiewe data oor die kennis van inheemse groen blaargroentes ingesamel wat die verkryging, voorbereiding, preservering en verbruikspatrone van hierdie groentes ingesluit het. 'n Geriefssteekproef van 102 respondente het aan die studie deelgeneem. Waarnemings is gedurende beide fases van die data insameling uitgevoer en fotos en volledige veldnotas is ingesluit. Dit is duidelik dat die beskikbaarheid van inheemse groen blaargroentes in hierdie gemeenskap afgeneem het, en dit wat beskikbaar was, was nie maklik toeganklik nie, omdat dit aan die buitewyke van die gemeenskap gelëe was. Ten spyte van die verandering in die fisiese en natuurlike omgewing is sommige inheemse groen blaargroentes steeds beskikbaar gedurende die somer. Dit is duidelik dat die ouer vroue, in vergelyking met die die jonger vroue oor meer kennis van inheemse groen blaargroentes beskik het met betrekking tot die identifisering, waar hulle groei en hoe om hulle te gebruik. Bekende en beskikbare inheemse groen blaargroentes soos gewone misbredie (Amaranthus) en knapsakkerwel (Bidens pilosa) was voorkeur groente en is redelik gereeld gebruik. Alhoewel inheemse groen blaargroentes steeds deel vorm van die voedselpraktyke in hierdie gemeenskap, het die gebruik daarvan deur die jonger geslag afgeneem. As gevolg van faktore soos modernisering, die ekonomie en tegnologiese vooruitgang het die meerderheid van beide die jonger en ouer geslag afhanklik geword van westers-georienteerde voedsel en dit dikwels in hulle eetpatrone ingesluit. Die resultate van hierdie studie het bygedra dat aanbevelings oor die vaslegging en bewaring van die kennis oor inheemse groen blaargroentes in hierdie gemeenskap gemaak kon word, asook om 'n oplewing in die belangstelling in die gebruik daarvan te bevorder.
Dissertation (MConsumer Science)--University of Pretoria, 2017.
Consumer Science
MConsumer Science
Unrestricted
Leke, Walter N., Djana B. Mignouna, Judith K. Brown, and Anders Kvarnheden. "Begomovirus disease complex: emerging threat to vegetable production systems of West and Central Africa." BioMed Central, 2015. http://hdl.handle.net/10150/610266.
Full textKerns, David L., and John C. Palumbo. "Confirm and Success: New Tools for Insect Management in Cole Crops and Leafy Green Vegetables in Arizona." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 1997. http://hdl.handle.net/10150/146759.
Full textVan, Averbeke W., Tshikalangem TE, and KA Juma. "The commodity systems of Brassica rapa L. subsp. chinensis and Solanum retroflexum Dun. in Vhembe, Limpopo Province, South Africa." Water SA, 2007. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1000785.
Full textBupo, Ana Dinorah. "The development of an innovative culinary product prepared from green leafy vegetables for the urban consumer." Diss., University of Pretoria, 2020. http://hdl.handle.net/2263/73421.
Full textDissertation (MSc)--University of Pretoria, 2020.
Consumer Science
MSc
Unrestricted
Garcia, Neto Júlio. "Concentrações e fontes de silício foliar na produção e na qualidade do agrião e do almeirão." Universidade Estadual Paulista (UNESP), 2018. http://hdl.handle.net/11449/153861.
Full textApproved for entry into archive by Alexandra Maria Donadon Lusser Segali null (alexmar@fcav.unesp.br) on 2018-05-04T17:23:54Z (GMT) No. of bitstreams: 1 garcianeto_j_me_jabo.pdf: 913083 bytes, checksum: 5a833ab7fa1d0e34d10d5321c04c4640 (MD5)
Made available in DSpace on 2018-05-04T17:23:54Z (GMT). No. of bitstreams: 1 garcianeto_j_me_jabo.pdf: 913083 bytes, checksum: 5a833ab7fa1d0e34d10d5321c04c4640 (MD5) Previous issue date: 2018-03-16
A pulverização foliar de silício (Si) pode beneficiar a produção e a qualidade das hortaliças folhosas, sendo desconhecidos esses efeitos no agrião-da-terra (Barbarea verna) e no almeirão (Cichorium intybus cv. Spadona). Objetivou-se verificar o efeito da pulverização foliar de silício em diferentes fontes e concentrações no teor foliar de Si, nas variáveis de crescimento, no teor foliar de ascorbato e na perda de água durante o armazenamento das hortaliças agrião e almeirão. Foram realizados dois experimentos, com as duas hortaliças cultivadas em vasos (4 dm3) preenchidos com areia, recebendo solução nutritiva. Durante o cultivo, a média da temperatura máxima atingiu 43,1 °C ± 10,6 °C. Utilizou-se delineamento inteiramente casualizado, em esquema fatorial 2 x 4, sendo duas fontes de silício: silicato de potássio e silicato de sódio e potássio estabilizado, e quatro concentrações de Si foliar: 0 (controle); 0,84; 1,68; 2,52 g L-1 de Si, com quatro repetições. As mudas foram transplantadas após 10 dias da emergência para vasos. Foram realizadas três aplicações foliares de Si, a cada dez dias, sendo a primeira realizada aos 28 dias após o transplantio (DAT). A pulverização foliar de silício é viável, para incrementar o acúmulo deste elemento na planta, o crescimento e a biofortificação, e diminui a perda de água da folha pós-colheita do agrião da terra e do almeirão, destacando-se a concentração de 2,52 g L-1 de Si na forma de silicato de potássio.
Silicon (Si) leaf spraying can benefit the production and quality of leafy vegetables. Such knowing is unclear to land cress (Barbarea verna) and root chicory (Cichorium intybus cv. Spadona). This study aimed was verify the effect of silicon leaf spraying under different sources and concentrations in Si leaf content, on growth variables, ascorbate leaf content, and water loss during storage of land cress and root chicory. We carried out two experiments with two vegetables grown in (4 dm3) pots filled with sand, receiving nutrient solution. During growing, the maximum temperature average was 43.1 °C ± 10.6 ºC. A completely randomized design was used in a 2 x 4 factorial scheme, with two sources of silicon: potassium silicate and stabilized sodium and potassium silicate, and four concentrations of leaf spraying Si: 0 (control), 0.84, 1.68, and 2.52 g L-1 of Si, with four replications. The seedlings were transplanted after 10 days of vessel emergence. Three Si leaf sprayings were done every ten days where the first spraying was at 28 days after transplanting (DAT). Silicon leaf spraying is feasible to increase the Si accumulation, plant growth and biofortification and decrease the post-harvest water loss of land cress and root chicory leaves. The Si concentration of 2.52 g L-1 as potassium silicate was highlighted.
Kerns, David L., and Tony Tellez. "Evaluation of Knack for Aphid Control in Green Leaf Lettuce." College of Agriculture, University of Arizona (Tucson, AZ), 1999. http://hdl.handle.net/10150/219963.
Full textKerns, David L., and Tony Tellez. "Evaluation of New Insecticides for Aphid Control in Green Leaf Lettuce." College of Agriculture, University of Arizona (Tucson, AZ), 1999. http://hdl.handle.net/10150/219976.
Full textMerget, Bernhard. "Assessing the risk of leafy green vegetables as a transmision pathway of verocytotoxigenic Escherichia coli to consumers." Thesis, University of Aberdeen, 2017. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=233893.
Full textMatheron, Michael E., and Martin Porchas. "Evaluation of Products to Manage Sclerotinia Leaf Drop of Lettuce in 2001." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2001. http://hdl.handle.net/10150/214916.
Full textMatheron, Michael E., and Martin Porchas. "Evaluation of Products to Manage Sclerotinia Leaf Drop of Lettuce in 2003." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2003. http://hdl.handle.net/10150/214971.
Full textMatheron, Michael E., and Martin Porchas. "Evaluation of New Fungicides for Management of Sclerotinia Leaf Drop of Lettuce in 1999." College of Agriculture, University of Arizona (Tucson, AZ), 1999. http://hdl.handle.net/10150/219972.
Full textWood, Jayde Lian. "Examination of microbiological quality of in-field leafy vegetables and identification of on-farm generic Escherichia coli transmission dynamics." Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/44613.
Full textZhao, Xin. "Exploring the effects of high tunnels and organic production systems on production and quality attributes of leafy vegetables in Kansas /." Search for this dissertation online, 2006. http://www.lib.umi.com/cr/ksu/main.
Full textVan, der Walt Anna Margaretha. "Fusarium in subsistence agro-environments, African dark green leafy vegetables (morogo) and consumer health : an ecological approach / A.M. van der Walt." Thesis, North-West University, 2008. http://hdl.handle.net/10394/1938.
Full textWafula, Eliud Nalianya [Verfasser], and Sascha [Akademischer Betreuer] Rohn. "Effects of Postharvest-Processing Technologies on the Safety and Quality of African Indigenous Leafy Vegetables / Eliud Nalianya Wafula ; Betreuer: Sascha Rohn." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2017. http://d-nb.info/1143868668/34.
Full textValerio, Maria Concetta <1980>. "Redox regulation in leaf starch metabolism. New insights into chloroplast Beta-amylase family." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2009. http://amsdottorato.unibo.it/2034/.
Full textUmeda, Kai. "Screening New Herbicides for Weed Control in Head and Leaf Lettuces and Broccoli." College of Agriculture, University of Arizona (Tucson, AZ), 2000. http://hdl.handle.net/10150/220399.
Full textDoerge, Thomas A., Kevin H. Pritchard, and Ted W. McCreary. "Nitrogen Management in Drip Irrigated Leaf Lettuce, Spinach and Green Crops." College of Agriculture, University of Arizona (Tucson, AZ), 1992. http://hdl.handle.net/10150/214500.
Full textPritchard, Kevin H., Thomas A. Doerge, and Ted W. McCreary. "The Response of Leaf Lettuce to Phosphorous Fertilizer Placement and Rate." College of Agriculture, University of Arizona (Tucson, AZ), 1994. http://hdl.handle.net/10150/214729.
Full textHartmann, Rahel [Verfasser]. "Environmental and agronomic effects on phyllosphere microbiology and the persistence of E. coli O157:H7 during the cultivation of leafy vegetables / Rahel Hartmann." Hannover : Technische Informationsbibliothek (TIB), 2017. http://d-nb.info/1152965387/34.
Full textVan, Averbeke W., KA Juma, and TE Tshikalange. "Yield response of African leafy vegetables to nitrogen, phosphorus and potassium: The case of Brassica rapa L. subsp. chinensis and Solanum retroflexum Dun." Water SA, 2007. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1000786.
Full textMatheron, Michael E., and Martin Porchas. "Comparison of New Fungicides to Manage Sclerotinia Leaf Drop of Lettuce in 2000." College of Agriculture, University of Arizona (Tucson, AZ), 2000. http://hdl.handle.net/10150/220001.
Full textMasinde, Peter Wafula. "Effects of water stress on the growth of spiderplant (Gynandropsis gynandra (L.) Briq.) and African nightshade (Solanum spp.), two traditional leafy vegetables in Kenya." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=969348231.
Full textRichards-Adams, Ingrid. "Increasing dark green leafy, yellow/orange, cruciferous vegetables, tomatoes, and physical activity in a low-income population an evaluation of a critical thinking approach /." [Ames, Iowa : Iowa State University], 2006.
Find full textMatheron, M. E., and J. C. Matejka. "Sclerotinia Leaf Drop of Lettuce - Screening New Fungicides for Disease Control in 1986." College of Agriculture, University of Arizona (Tucson, AZ), 1987. http://hdl.handle.net/10150/221404.
Full textMatheson, Michael E., and Joseph C. Matejka. "Sclerotinia Leaf Drop on Lettuce -- Evaluation of New Fungicides for Disease Control." College of Agriculture, University of Arizona (Tucson, AZ), 1989. http://hdl.handle.net/10150/214265.
Full textFigueiredo, Patrícia Isabel Duarte de. "Leaf lettuce matabolome during aging and under stress." Master's thesis, Universidade de Aveiro, 2011. http://hdl.handle.net/10773/8153.
Full textThe plant metabolome is extremely diverse due to the extraordinary variety of secondary metabolites. Nuclear magnetic resonance (NMR) spectroscopy techniques in metabonomics have been used for the identification of metabolite presents in plants under stress. The work reported in this thesis aimed to evaluate the metabolic and physiological changes that occur in lettuce leaves, caused by aging, light and dark growth conditions and due to exposure to mancozeb pesticide. Lettuces were grown during four weeks, and then separated in two groups in order to study the light/dark conditions and mancozeb pesticide exposure during growth. For the light/dark conditions study some lettuces were exposed during one week to a light intensity of 200 ± 20 μmol.m–2.s–1 (control), and others to 20 ± 20 μmol.m–2.s–1 (dark conditions). In the pesticide assay, the mancozeb was applied to a set of lettuces and not to the other (control). After one week, young leaves (from the first node) and expanded leaves (from the apical node) were collected. In general, the results show that the leaf age, the light/dark conditions and the exposure to mancozeb influence the plant physiological performance, such as pigment concentration and photosynthetic efficiency, as well as the plant metabolomic composition. The results show that young leaves show higher contents of glucose and sucrose, and lower contents of malic and citric acids than expanded leaves, and there was no significant differences in the physiological parameters measured. In the dark, the lettuce leaves present a decreased in the photosynthetic performance, which was more marked in expanded leaves compared to young leaves, resulting in significant decreases of glucose and sucrose on these leaves. Moreover, exposure of lettuce leaves with mancozeb resulted in decrease in photosynthetic performance, more marked in expanded leaves than in young leaves, with accumulation of glucose and decrease in some amino acids and several organic acids.
O metaboloma das plantas é extremamente diverso devido à enorme variedade de metabolitos secundários. A espectroscopia de ressonância magnética nuclear (RMN) é cada vez mais utilizada na metabonómica, na identificação dos metabolitos presentes nas plantas quando estas se encontram sob stress. O trabalho apresentado nesta tese teve como objetivo avaliar as alterações metabólicas e fisiológicas que ocorreram na folha da alface causadas pelo envelhecimento, por condições de crescimento na luz e no escuro e devido à exposição ao pesticida mancozebe. As alfaces cresceram durante quatro semanas, e foram depois separadas em dois grupos de forma a estudar as condições luz/escuro e exposição ao pesticida mancozebe durante o crescimento. No estudo das condições luz/escuro algumas alfaces foram expostas durante uma semana a luz de intensidade de 200 ± 20 μmol.m–2.s–1 (controlo) e outras a 20 ± 20 μmol.m–2.s–1 (condições no escuro). Nos ensaios com o pesticida, foi aplicado o mancozebe a um conjunto de alfaces e ao outro não (controlo). Após uma semana, recolheu-se as folhas novas (primeiro nó) e folhas expandidas (nó apical). Em geral, os resultados mostram que a idade da folha, as condições de luz e a exposição ao mancozebe influenciam, tanto o desempenho fisiológico da planta, ou seja, concentração de pigmentos e eficiência fotossintética, como a composição metabólica da planta. Os resultados mostram que as folhas jovens têm maiores teores de glucose e sacarose, e menor teor de ácido málico e cítrico que as folhas expandidas, e que não houve diferenças significativas nos parâmetros fisiológicos medidos. No escuro, as folhas de alface apresentam uma diminuição na performance fotossintética, que foi mais acentuada nas folhas expandidas em comparação com folhas jovens, resultando em reduções significativas de glucose e sacarose nessas folhas. Além disso, a exposição de folhas de alface ao mancozebe resultou na diminuição da performance fotossintética, mais acentuada em folhas expandidas do que nas folhas jovens, com acumulação de glucose e decréscimo de alguns aminoácidos e vários ácidos orgânicos.
Tsai, Zong-Ye, and 蔡宗燁. "The growth characteristic of aeroponically-grown six leafy vegetable." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/76345199295315166406.
Full text國立中興大學
農藝學系所
104
A plant factory is a controlled environment for plant production systems with artificial light, temperature, humidity, carbon dioxide, water supply, and nutrients. Due to the high operation and start-up cost of plant factories, the plant factory system is most often used to cultivate leafy vegetables that have a high-profit return and require to develop a more efficient production systems. In this study, five common lettuce cultivars including sword lettuce (Lactuca sativa L. var. sativa bisch), red fire lettuce (Lactuca sativa L. var. crispa cv Red Fire), butterhead lettuce (Lactuca sativa L. var. capitata cv Butterhead), antlers shaped lettuce (Lactuca sativa L. var. sativa bisch x Pterocypsela), green romaine lettuce (Lactuca sativa L. var. longifolia cv Green), and one Brassica variety tatsoi (Brassica narinosa L.) are selected as high-profit return materials and conducted to test the feasibility of three stage cultured method based on plant size for leafy vegetables in fully controlled plant factory with aeroponic culture. Growth data collected from the experiment of three stage culture show the typical sigmoid pattern and reach harvestable weight within 28 days of cultivation except for red fire lettuce which will take 42 days. Rapid growth rate will appear at last week and depend on the variety. Comparison of aeroponic and field-produced leafy vegetables show that the hydroponic plants grown faster, accumulate more biomass than the field-produced plants except green romaine and red fire lettuce. Plants grown at field show the higher transpiration rate, while plants grown at plant factory exhibited the greater intercellular CO2 concentration. However, nitrate content in all tested plants is lower than 2000 ppm which agree with EUs regulation. These results demonstrate that three stages culture is an efficient leafy vegetables production system. In addition, the effects of partial replacement of nutrient on plant growth are also investigated. Biomass data indicate that there are not significant difference between noncirculating method and reused nutrient culture except tatsoi and green romaine lettuce. Analysis of residues show that sword lettuce accumulate more nitrogen, phosphate, and potassium element than the others while red fire lettuce need more calcium and magnesium. The absorption of different kinds of mineral element depends on the variety. Further investigation on mineral consumption during recycle aeroponic culture will provide useful information for nutrient management.