Thesis (MScAgric)--University of Stellenbosch, 2008. / Bibliography. Also available via the Internet.

In North America, industrial agriculture has led to cheap abundant food while separating direct links between the city and countryside. This thesis attempts to use architecture to reconnect people in Manhattan, New York City, with food production and serve as a model for sustainability. The thesis analyzes Manhattan’s food network, and seeks a site which has the potential for several factors: site accessibility, renewable resources, solar exposure, and integration into the community. These factors serve as the basis in which to build a hybrid prototype that is able to expose people to the process of food production through a combination of traditional outdoor farming methods and indoor hydroponics in the form of a vertical farm. Farmers and customers can be seen together as one entity instead of two disconnected dependencies. The reintegration of food production into the city can be seen as a re-alliance of the country and the city.

Thesis (M.Arch.)--University of Hong Kong, 2000. / Includes special report study entitled : A study on building technologies for an agricultural skyscraper. Includes bibliographical references. Also available in print.

Thesis (doctoral)--Swedish University of Agricultural Sciences, 2003. / Appendix consists of reprints and manuscripts of five papers co-authored with others. Includes bibliographical references. Also partially available online in PDF format; online version lacks appendix.

Submitted by Lucienne Costa (lucienneferreira@ufcg.edu.br) on 2018-04-10T17:36:57Z No. of bitstreams: 1 RODRIGO VIEIRA ALVES - TESE (PPGEQ) 2017.pdf: 4663584 bytes, checksum: 1fbfe2df3144935946e63d14cdcc7ade (MD5) / Made available in DSpace on 2018-04-10T17:36:57Z (GMT). No. of bitstreams: 1 RODRIGO VIEIRA ALVES - TESE (PPGEQ) 2017.pdf: 4663584 bytes, checksum: 1fbfe2df3144935946e63d14cdcc7ade (MD5) Previous issue date: 2017-08-31 / Capes / O processo de dessalinização de águas salobras vem sendo uma das alternativas de obtenção de água potável, para beneficiar as comunidades difusas da região do semiárido. Dentro dessa conceituação foram implantados dois sistemas de dessalinização para produção de água potável: um na comunidade de Uruçu da Cidade de São João do Cariri, e outro na Escola Macário Zulmiro do distrito de Santa Luzia, da Cidade de Picuí, ambos no Estado da Paraíba. O aproveitamento dos concentrados gerados durante o processo de dessalinização dos sistemas foram estudados para produção de alface, através de sistemas hidropônicos de fluxo laminar de nutrientes. O objetivo desse trabalho foi avaliar os parâmetros de crescimento, níveis de nitrato, aspectos sensoriais e dos custos de produção de alface hidropônica com uso do concentrado. Foram realizados experimentos a partir do concentrado (1) com níveis de tratamentos de (0,1; 2,3; 4,4; 6,2 e 8,4) mS.cm-1 e com o concentrado (2), nos níveis de (0,1; 1,1; 2,1; 3,1 e 4,1) mS.cm-1 para o cultivo das alfaces crespa “crocante” e americana “gloriosa”. O delineamento experimental foi inteiramente ao acaso, com três repetições. Observou-se que o desenvolvimento das duas alfaces estudadas, dependeram dos níveis da condutividade elétrica de cada concentrado. O consumo hídrico das plantas foi reduzido em 7,53% e 8,89% para alface crespa e americana cultivadas com o concentrado (1) e 1,60% e 4,03 para o concentrado (2), por incremento unitário de condutividade elétrica, respectivamente. Foi observado com os resultados dos parâmetros de crescimento, que a alface crespa apresentou maior tolerância ao excesso de sais do concentrado, quando cultivadas com os tratamentos do concentrado (1), principalmente nos tratamentos 6,2 e 8,4 mS.cm-1, observadas pelas reduções lineares do número de folhas, massa fresca da parte aérea, massa seca da parte aérea, umidade, massa seca das raízes, massa do caule e área foliar. As reduções dos parâmetros de crescimento foram menores ao utilizar o concentrado (2) e os dois tipos de alface foram tolerantes aos níveis dos tratamentos. Com relação as concentrações de nitrato, foram encontrados resultados variando entre 694,5 e 1.982,0 mg.kg-1 nas alfaces crespa e americana, os quais estão de acordo, com o valor máximo permissível (3.500 mg.kg-1) da regulamentação europeia 1881/2006, das quais, a alface americana acumulou mais nitrato do que a crespa. Nos experimentos com o concentrado (1), os atributos cor, sabor, crocância e impressão global foram afetados com o excesso de sais nos experimentos com alface americana, enquanto para alface crespa, foram afetados a cor, sabor e impressão global. Ao utilizar o concentrado (2), nenhum parâmetro foi afetado para o experimento com alface crespa. A preferência de compras foi acima de 90% para a alface crespa cultivada com o concentrado (2). Os resultados das estimativas dos custos mostraram um investimento de R$114.663,00 na implantação dos sistemas hidropônico e de dessalinização, retorno sobre investimento em aproximadamente 4 anos, custos de produção da alface de R$ 0,30 por planta e custos para produção da água de R$ 1,47 por m³. / The process of desalination of brackish water has been one of the alternatives for obtaining potable water to benefit the diffuse communities in the semi-arid region. Two desalination systems for potable water production were implemented: one in the community of Uruçu in the city of São João do Carirí and another in the School Macário Zulmiro in the district of Santa Luzia in the city of Picuí, both in the state of Paraíba. The utilization of the concentrates generated during the desalination process of the systems were studied for lettuce production through hydroponic laminar flow systems of nutrients. The objective of this work was to evaluate growth parameters, nitrate levels, sensory aspects and production costs of hydroponic lettuce using concentrate. Experiments were performed from the concentrate (1) with treatments levels of (0.1; 2.3; 4.4; 6.2 and 8.4) mS.cm-1 and with the concentrate (2), in the (0.1, 1.1, 2.1, 3.1 and 4.1) mS.cm-1 levels for the cultivation of crisp "crocante" and american "gloriosa" lettuce. The experimental design was completely randomized, with three replicates. It was observed that the development of the two lettuces studied depended on the electrical conductivity levels of each concentrate. The water consumption of the plants was reduced by 7.53% and 8.89% for crisp and American lettuce cultivated with concentrate (1) and 1.60% and 4.03 for concentrate (2), per unit increment of conductivity respectively. It was observed with the results of the growth parameters that the crispy lettuce presented higher tolerance to the excess salts of the concentrate when cultivated with the treatments of the concentrate (1), mainly in the treatments 6,2 and 8,4 mS.cm-1, Observed by linear reductions of leaf number, fresh shoot mass, shoot dry mass, moisture, dry mass of roots, stem mass and leaf area. The reductions of the growth parameters were lower when using the concentrate (2) and the two types of lettuce were tolerant to the levels of the treatments. Regarding the nitrate concentrations, results ranging from 694.5 to 982.0 mg.kg-1 were found in crisp and american lettuce, which are in agree with the maximum permissible value (3,500 mg.kg-1) of the regulation European seed 1881/2006 and american lettuce accumulated more nitrate than crisp. In the experiments with concentrate (1), the attributes color, flavor, crispness and overall impression were affected with the excess salts in the experiments with American lettuce, while for crisp lettuce, the color, flavor and overall impression were affected. When using the concentrate (2), no parameter was affected for the experiment with crisp lettuce. The purchase preference was above 90% for the crisp lettuce grown with the concentrate (2). The results of the cost estimates showed an investment of R$ 114,663.00 in the implementation of hydroponic and desalination systems, return on investment in approximately four years, lettuce production costs of R$ 0.30 per plant and costs for water production of R$ 1.47 per m³.

With a continued worldwide trend in population shift from rural to urban areas predicted to increase, new approaches to agricultural production must be considered and implemented. Little academic interest has been applied to determining economically viable urban agriculture crop production sites for business investment. A feasibility model to aid investors in selecting appropriate sites for the development of urban agriculture food production within population centers was created. Lettuce crop trials were performed from August 2015 to December 2015 at the University of Arizona Controlled Environment Agriculture Center to validate the productivity of a unique high density hydroponic system designed for the rooftop environment. The feasibility model is based on this system and with a minimal number of inputs, ranging from size of growing space to growing media costs, determines a wide range of useful outputs. These outputs include crop productivity within the facility, material inputs and a cost breakdown of starting a new agricultural venture. The model utilizes multiple sheets within one excel document to give the user a clear and organized financial perspective of a hypothetical growing operation in the main sheet. With this model, investors into urban agriculture will have a means to gain an objective view of financial considerations before substantial investment is completed.

Please read the Resume in the section 06resume of this document / Dissertation (MSc (Agric))--University of Pretoria, 2006. / Microbiology and Plant Pathology / unrestricted

The ability of the accumulation of thorium and study of the stress responses on his presence was tested on a selected cultivar of tobacco, La Burley 21. Plants were cultivated in Hoagland's hydroponic medium under artificial light. Except to the ability of accumulation and distribution of thorium in the all parts of plant was investigated the effect of selected organic and inorganic additions on accumulation. Among organic substances included citric acid, tartaric and oxalic acid in their presence was observed the increase of thorium in all parts of the plant. Were also tested products from the diamine and polyamines (putrescine, cadaverine, spermine and spermidin). These substances, also known for their antioxidant activity in plants, had an impact on reducing the accumulation of thorium, especially in the root system of plants. The most important factor influencing the accumulation of thorium was the absence of phosphate ions in a hydroponic medium, which caused the rise of the concentration of thorium about several levels in all parts of the plants. The initial decrease of pH after additions of organic acids or addition of high concentrations of thorium and the gradual increase of pH during cultivation had proved significant. It was also compared the uptake of accumulation and distribution of...

This study responds to the effect that current food production has on the natural environment, by researching urban systems and ecosystems. In reaction to the findings, a new food production system and the urban buying and retail culture are investigated. A food market and hydroponic production building is designed to serve as an alternative to the supermarket and conventional food production. AFRIKAANS : Hierdie studie reageer op die uitwerking wat huidige voedsel produksie op die natuurlike omgewing het, deur stedelike stelsels en ekostelsels te bestudeer. In reaksie op die bevindings word ‘n nuwe voedsel produksie stelsel en die stedelike koop-enverkoop- kultuur ondersoek. ‘n Varsprodukte mark en hidroponiese produksie-gebou word ontwerp om ‘n alternatief te bied vir die supermark en konvensionele voedselproduksie. / Hierdie studie reageer op die uitwerking wat huidige voedsel produksie op die natuurlike omgewing het, deur stedelike stelsels en ekostelsels te bestudeer. In reaksie op die bevindings word ‘n nuwe voedsel produksie stelsel en die stedelike koop-en verkoop- kultuur ondersoek. ‘n Varsproduktemark en hidroponiese produksie-gebou word ontwerp om ‘n alternatief te bied vir die supermark en konvensionele voedselproduksie. / Dissertation (MArch(Prof))--University of Pretoria, 2011. / Architecture / unrestricted

Vertical farming has been proposed as a solution for providing food security for an increasing, urbanized human population. Light-emitting diode (LED) technology has become increasingly affordable and efficient, making it an ideal choice as artificial lighting for indoor farms. Still largely undiscovered parameters are the optimal plant varieties and types of production systems for plant growth, profit, and human nutrition. Aquaponics may be able to provide sustainable animal protein for vertical farms, increasing their ability to provide more substantial nutrition to consumers. This research aimed to better understand vertical farming as a food production system, and to determine if aquaponics can be an appropriate and applicable fit for it. The experiment was a randomized, factorial design with three independent variables: (1) LED photoperiod interval (2) LED-plant distance, and (3) nutrient solution, as well as several dependent variables to assess both plant yield and quality. A 4-tiered shelving unit was constructed for nutrient film technique (NFT) plant production, and treatments were assigned to each row: (1) LED experiment: Row A, 12/12hr reduced photoperiod with adjustable LEDs 4in. above plant surface; Row B, 2/1hr altered photoperiod interval relative to the control; Row C (control), 16/8hr “standard” photoperiod. (2) Nutrient experiment: Row C, aquaponic nutrient solution; Row H, hydroponic nutrient solution. Rows C and H had matched photoperiod and light intensity. Kale from Row A had significantly lower fresh and dry plant yield relative to the control, Row C (p<0.05). Hydroponic romaine, Row H, had significantly higher plant yield relative to aquaponics, Row C (p<0.05). Butterhead yields were not significantly different in any treatments (p>0.05). Future research may implement a larger sample size of only one plant variety, harvest plants earlier, limit light intensity variation, effectively “balance” the aquaponics system, and have more measures of plant “quality.”