Academic literature on the topic 'Sprinkler irrigation. Irrigation efficiency'

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Dissertations / Theses on the topic "Sprinkler irrigation. Irrigation efficiency"

1

Breytenbach, Adell. "The market potential for the floppy sprinkler irrigation system in the global agricultural sector." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/21378.

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Thesis (MBA)--Stellenbosch University, 2012.<br>This research study analyses the market potential for the Floppy Sprinkler irrigation system in the global market. It explores the global irrigation market and its environment to identify the driving forces that influence the industry as well as the potential that Floppy Sprinkler could unleash as a competitor. The researcher assesses the industry value chain to determine the fit and alliance opportunities for Floppy Sprinkler in the value chain. The study further analyses the competitive pressures influencing the competitive environment. Applied research is used in this study to gain a comprehensive understanding of the market. Acknowledged diagnostic models in the field of strategic management were used to guide the study. These included the PESTLE analysis to evaluate the macro-environment of the agriculture sector; the value chain analysis to assess the agricultural industry value chain; Porter’s Five Forces Model to analyse the competitive pressures for Floppy Sprinkler; and the SWOT analysis to identify the strengths, weaknesses, opportunities and threats. The relevant data were collected through both primary and secondary sources. Two questionnaires were designed, the first to industry specialists in the agriculture sector with the purpose to gain insight of the irrigation and agriculture environment; and the second to Floppy Sprinkler irrigation system users, with the purpose to obtain a rating, opinion and relevance of the product in the market. The research disclosed that forces within the macro environment influence the industry significantly. These specifically revolved around climate change, water scarcity, land availability, soil degradation, population growth and changing lifestyles. The value chain analysis revealed that opportunities exist in the agriculture industry to create horizontal and vertical alliances to strengthen Floppy Sprinkler’s position in the market. Competitive pressures in the market include direct competitors of Floppy Sprinkler, as well as the bargaining power of suppliers and buyers. Threat of new entrants and substitute products are not perceived to be immediate competitive pressures for Floppy Sprinkler owing to its cutting-edge technology, which offers a distinctive competitive advantage. Finally, opportunities were identified, which served as recommendations for Floppy Sprinkler in developing its strategy.
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Almeida, Alex Nunes de. "Dimensionamento do sistema de Irrigação por Gotejamento Móvel (IRGMO): metodologia de cálculo e software." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/11/11152/tde-23092016-184743/.

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Com a necessidade de se promover o uso eficiente da água na agricultura, aprimoramentos e novos desenvolvimentos em equipamentos de irrigação são sempre bem-vindos. Um sistema de irrigação por gotejamento móvel (IRGMO), trata-se da união entre a irrigação por pivô central (irrigação por aspersão) e a irrigação por gotejamento (irrigação localizada). O sistema é constituído por tubos de descida que unem a linha principal do pivô central (aço zincado) com as linhas gotejadoras (polietileno). A vazão em cada ponto de derivação do pivô é calculada em função da vazão dos gotejadores e do número de emissores por metro linear de mangueira. A área é irrigada através do movimento circular do equipamento no campo, que arrasta sobre o terreno e sobre o dossel das plantas as linhas gotejadoras. As vantagens deste sistema híbrido de irrigação é poder utilizar gotejadores de vazão elevada (2 - 12 litros/ hora), o que reduz o risco de entupimento do sistema, assim como, requerer somente 1 a 2 % da quantidade equivalente de metros lineares de tubogotejadores da irrigação localizada fixa sobre o terreno. Este trabalho teve como objetivo apresentar uma metodologia de cálculo para o dimensionamento deste novo sistema de irrigação por gotejamento móvel, assim como, desenvolver um software livre de dimensionamento deste sistema. O software foi desenvolvido em Visual Basic 2015, utilizando a interface do Microsoft Visual Studio Community 2015 (Windows). A linguagem de programação segue a metodologia baseada em um conjunto de 44 equações, as quais por meio parâmetros fornecidos pelo usuário possibilitam o dimensionamento do sistema. O resultado foi um software leve, capaz de realizar os cálculos necessários rapidamente, apresentando ao final dimensionamento uma janela com resumo do sistema IRGMO e uma tabela contendo as informações para cada linha de derivação. Os resultados podem ser salvos em um arquivo de texto ou podem ser enviados diretamente ao Microsoft Excel, os parâmetros utilizados pelo usuário podem ser salvos também, dessa forma permitindo que um mesmo dimensionamento possa ser feito várias vezes. Além de apresentar o software desenvolvido, este trabalho apresenta também alguns cenários de dimensionamento.<br>With the need to promote the efficient use of water in agriculture, enhancements, and new developments in irrigation equipments are always welcome. A mobile drip irrigation system (IRGMO), is the union of center-pivot irrigation (sprinkler irrigation) and drip irrigation (localized irrigation). The system consists of lowering pipes connecting the main line of the central pivot (galvanized steel) with driplines (polyethylene). The flow at each point deriving from the pivot is calculated in function of the flow rate drippers and a number of transmitters per linear meter of hose. The area is irrigated through the circular motion of the equipment in the field which drags on the ground and on the canopy of plants driplines. The advantages of this hybrid system of irrigation is the use of high flow drippers (2-12 liters/hour), which reduces the risk of clogging the system, as well as it requires only 1 to 2% of the equivalent amount of linear meters of irrigation driptubes fixed on the ground. This work aimed to introduce a calculation methodology for the sizing of this new mobile drip irrigation system, as well as, to develop a free software system sizing. The software was developed in Visual Basic 2015, using the interface of Microsoft Visual Studio Community 2015 (Windows). The programming language follows the methodology based on a set of 44 equations, which through user-supplied parameters allows the sizing system. The result was a lightweight application, able to perform the necessary calculations quickly, showing the end sizing a window with a summary of the IRGMO system and a table containing the information for each line. The results can be saved in a text file or sent directly to Microsoft Excel, the parameters used by the user can be saved as well, and thus allowing that an even sizing can be done several times. In addition to introducing the application development, this paper presents also some sizing scenarios.
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3

Braz, Paula Manuela Hilário. "Estudo comparativo de dois sistemas de rega por aspersão: canhão automotor e barra de aspersores." Master's thesis, Universidade de Évora, 1998. http://hdl.handle.net/10174/15710.

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A água é um recurso cada vez mais escasso, em quantidade e em qualidade, cujo consumo crescente aumenta a necessidade de melhorar constantemente a concepção e o dimensionamento dos sistemas de rega. No presente trabalho caracterizou-se e avaliou-se o desempenho de um equipamento de rega automotor com canhão e com barra, esta trabalhando com aspersores de impacto de média pressão, observando-se a capacidade de ajustamento destes equipamentos às condições particularmente difícies de um solo Mediterrâneo. Os ensaios de campo consistiram na avaliação dos referidos sistemas mediante uma rede de pluviómetros colocados na área dominada pelos aspersores. Os valores de Uniformidade de Distribuição e do Coeficiente de Uniformidade de Christiansen obtidos nas diferentes avaliações foram muito variáveis, dependendo fundamentalmente da velocidade do vento durante o ensaio e da pressão de funcionamento dos aspersores. Só se alcançaram níveis aceitáveis quando se considerou 35% de sobreposição entre faixas adjacentes, obtendo-se os melhores resultados nos equipamentos funcionando com menor pressão de serviço. As perdas por evaporação e arrastamento pelo vento foram consideráveis, o que originou Eficiências Potenciais de Aplicação baixas. Estas perdas foram superiores no equipamento canhão. Verifica-se a existência potencial de escorrimento superficial, junto da linha de passagem do aspersor, uma vez que a intensidade de precipitação excede a infiltrabilidade do solo. Este escorrimento verificou-se unicamente para uma velocidade de deslocação do equipamento de 10 mlh. ### Abstract - As water availability continuously decreases, irrigation systems must be carefully designed and used. In the present work a hose-drawn travelling sprinkler system was evaluated with two travelling sub-systems: a gun sprinkler and a lateral bar equipped with medium pressure sprinklers. Field experiments consisted on the evaluation of the refered systems, using a set of catch cans conveniently placed on the area irrigated by the sprinklers. The values of the Distribution Uniformity (UD) and Coefficient of Uniformity of Christiansen (UC) observed in the different evaluations were quiet variable, depending on the wind speed during the evaluation and the sprinkler operational pressure. Acceptable values of UD and UC were obtained only when a 35% overlapping between two paths were considered. Wind drift and evaporation tosses were significant. Thus, low values of Potential Application Efficiency were observed. Such tosses were greater with the travelling gun system. Excess water above soil infiltrability, therefore with a potential for runoff and erosion, was observed only for 10 m/h speed of travelling.
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Roth, R. L., and B. R. Gardner. "Vegetable Research Under Sprinkler Irrigation." College of Agriculture, University of Arizona (Tucson, AZ), 1986. http://hdl.handle.net/10150/214110.

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5

Gardner, B. R., and R. L. Roth. "Asparagus Production Under Sprinkler Irrigation." College of Agriculture, University of Arizona (Tucson, AZ), 1986. http://hdl.handle.net/10150/214133.

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6

Zittlosen, Russell Howard. "ESTABLISHMENT OF DIRECTLY SEEDED GUAYULE USING SPRINKLER IRRIGATION." Thesis, The University of Arizona, 1985. http://hdl.handle.net/10150/275366.

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7

SILVA, Jonas Carlos Santino. "Desempenho do sistema de irrigação por aspersão, tipo pivô central rebocável." Universidade Federal de Campina Grande, 2002. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/802.

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Submitted by Deyse Queiroz (deysequeirozz@hotmail.com) on 2018-05-24T19:31:37Z No. of bitstreams: 1 JONAS CARLOS SANTINO - DISSERTAÇÃO PPGEA 2002..pdf: 8664728 bytes, checksum: 1073738dd910a18404b200d943f370f2 (MD5)<br>Made available in DSpace on 2018-05-24T19:31:37Z (GMT). No. of bitstreams: 1 JONAS CARLOS SANTINO - DISSERTAÇÃO PPGEA 2002..pdf: 8664728 bytes, checksum: 1073738dd910a18404b200d943f370f2 (MD5) Previous issue date: 2002-08<br>O objetivo deste trabalho foi avaliar a performance de um pivô central rebocável em nível de campo, na Fazenda Capim, localizada no município de Capim-PB. Os resultados da avaliação do equipamento nas três bases estudada levaram a concluir que: o equipamento apresentou bons resultados quando analisado como um todo para as base, constatou-se problemas de uniformidade e de eficiência em alguns setores quando a análise foi feita por raio individualmente, indicando setores com déficit e outros com excesso de água, o equipamento apresentou seus piores resultados quando foi avaliado na base 5, verificou-se que existe uma dispersão das lâminas de água aplicadas em relação ao valor médio, em todas as bases estudadas, as pressões de entrada do pivô nas bases, 4 e 5 estão muito abaixo da pressão recomendada o que resultou numa baixa vazão nestas bases.<br>The objective of this work was to evaluate the performance of a towable pivot center in thefield on Fazenda Capim in the municipal district of Capim-PB. The results of the equipment evaluation of the three studied bases showed that the equipment presented goodresults when analyzed as a whole for them. Uniformity and efficiency problems in some sections were analyzed when the analysis was individually made by ratio, indicating sections with deficit and other with excess of water. The equipment presented their worst results when it was evaluated in base 5. It was verified a dispersion of the applied water sheets in relation to the mean value, in ali studied bases. The pressures on pivot in bases 4 and 5 are a lot below the recommended pressure and resulted in low flow in these bases.
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Tickes, Barry. "Evaluation of Kerb Applied by Sprinkler Irrigation to Lettuce." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2003. http://hdl.handle.net/10150/214975.

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Three tests were conducted to compare delayed applications of Kerb applied by air with those applied through the sprinklers. Early (6-5-02) season and mid (10-20-02) applications made through the sprinklers were significantly more effective than those applied by air. The late season (11-17-02) application was made too early and the weed control was poor demonstrating the need for proper timing regardless of the application technique. It was concluded that chemigation can be an effective technique for making delayed applications of Kerb to lettuce in the low deserts.
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Anwar, Arif Aziz. "Correction factors for sprinkler laterals." Thesis, University of Southampton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324845.

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Malik, Manzoor Ahmad. "Evaluation of infiltration into freshly tilled soils under sprinkler irrigation." Thesis, University of Newcastle Upon Tyne, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.283905.

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