992 resultados para Irrigation System


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In Brazil, common bean is in one of the most representative economic crops, not only because of its growing area but also because of the economic value of its production. In the crop year 2006/07, in Selvíria (MS), we analyzed the common bean yield as a function of some physical attributes of a Typic Acrustox in minimum tillage and center pivot irrigation system. The aim of this work was to evaluate among the soil physical attributes, under minimum tillage, those that better explain the variability of bean yield using the Pearson and spatial correlations,. A geostatistical grid was installed to collect data from soil and plants, with 117 sampling points in an area of 2025 m² and homogeneous slope of 0.055 m m-1. The results showed a low yield of bean, which occurred probably due to a lower density of plants that the system provided. Thus, for the minimum tillage system, the bean yield could be explained as a function of total porosity and bulk density.

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O sistema de irrigação por aspersão convencional é muito utilizado na suplementação de água na cultura da batata. Pressionado, devido à baixa eficiência de aplicação de água, este têm sido substituído pela irrigação por pivô central e localizada, objetivamente mais eficiente. A adoção de sistemas mais eficientes a programas de manejo de irrigação podem aumentar a eficiência do uso de água da batateira. Diante disso, o presente trabalho objetivou a avaliação do efeito de diferentes lâminas e regimes de irrigação no cultivo de batata durante a estação outono/inverno de 2007, na região Sul do estado de Minas Gerais. O experimento foi conduzido sob delineamento estatístico de blocos casualizados, com parcelas subdivididas e quatro repetições. Nas parcelas as duas frequências de irrigação [F4(quatro dias) e F6(seis dias)], e nas subparcelas as quatro lâminas de irrigação em função do percentual da irrigação total necessária (ITN) [L1: 0,8 ITN (80%); L2: 1,00 ITN (100%); L3: 1,10 ITN (110%) e L4: 1,25 ITN (125%)]. As variáveis qualitativas foram avaliadas pelo teste t, com nível de probabilidade (≤10%) e análise de regressão, considerando os valores dos coeficientes de regressão (R²). O ciclo total foi de 119 dias com evapotranspiração média de 181,0 a 186,4 mm. As menores lâminas aplicadas foram 129,5 mm e 133,3 mm em L1, nas frequências de 4 e 6 dias e as maiores 203,4 mm e 209,3 mm em L4 para as frequências de 4 e 6 dias, respectivamente. As maiores produções de batata graúda ocorreram nas lâminas de irrigação de 0,99 e 1,05 ITN para as frequências F4 e F6. A maior produção total foi obtida em F6, com a lâmina de 1,06 ITN. O maior valor de uso eficiente de água foi de 38,05 kg de tubérculo m-3 de água, obtido com a combinação de tratamentos F6/L2 e o menor 32,89 tubérculo m-3 de água na combinação F4/L1.

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Pós-graduação em Agronomia (Irrigação e Drenagem) - FCA

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Brazil stands out as the world's largest producer of sugarcane and its productivity is closely related to the availability of water and nitrogen during its development and also to the incidence of pest insects. Among the species most harmful to the sugarcane in Brazil, Mahanarva fimbriolata stands out, which has seriously endangered the yields. In this context, the present study aimed to evaluate the effect of the nitrogen fertirrigation on the incidence and damage caused by M. fimbriolata in sugarcane. The experiment was composed of five treatments and four replications in a randomized block design (RBD). The treatments were composed of four doses of N-fertilizer and control (0, 50, 100, 150, 200 kg.ha-1) in drip irrigation system. The parameters evaluated were: number of nymphs in the roots, stalk productivity, sugar content, percentage of sugar, total recoverable sugar and the agricultural contribution margin. It was observed that the fertirrigation increases the productivity of stalks and sugar with the increase of nitrogen fertilization by irrigation. The use of 200 kg.ha-1 of N-fertilizer increased the incidence of M. fimbriolata up to the control and economic damage levels. The biggest financial yield was obtained with the dose of 150 kg.ha-1 of N-fertilizer.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Pós-graduação em Agronomia (Irrigação e Drenagem) - FCA

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Pós-graduação em Agronomia (Irrigação e Drenagem) - FCA

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Pós-graduação em Agronomia (Produção Vegetal) - FCAV

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In the pumping pipelines the located load losses are very important since they have direct influence on hydraulic design of an irrigation system, especially regarding the concentric reducers used in the distribution lines. Hence this work was conducted in the Laboratório de Hidráulica do Centro Federal de Educação Tecnológica de Uberaba. We analyzed 03 concentric reducers PVC 75 x 50 mm, 50 mm and 35 x 35 x 1 "operating at different flow rates. The performance of the tests with the variation of flow in every situation possible to obtain equations to estimate the loss. The equation models presented a high setting, thus enabling the determination of the localized head loss in a situation closer to field reality. For the reduction of 75 x 50 x 35 mm and 50 mm at a flow rate 16.97 m³ h-1 the pressure drop reduction was obtained respectively 0.9263 and 2.7408 mca. To the reduction of 35 x 1 "at a flow rate of 6.02 m³ h-1 was obtained 2.9304 mca pressure drop reduction. The located losses produced by these reductions are relatively high and should be considered with great discretion in hydraulic design of the irrigation system.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Pós-graduação em Agronomia (Proteção de Plantas) - FCA

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We begin our Master Conservationist recognition in Production Agriculture with the Buskirk Family of Hemingford in the Panhandle. Will David and Toni Buskirk, Dean and Sonya Buskirk, Chad Buskirk, and Dustin and Shelly McConville, please come forward? They started with a half-section which has grown to 2,855 acres, as well as a tree-planting business. The family formed a partnership in 1995 and named it “Trees are Us” in 1998. They have used no-till farming on 1,000 acres of cropland since 1980 and planted over 165,000 trees. A low-pressure irrigation system saves about 400 acre inches of water every growing season. They built their own no-till tree planter for differing soil conditions and a machine to install biodegradable weed barriers. Their enthusiasm for trees is contagious as they visit with others and perform volunteer work in the area. Their unique tree planting equipment is made available nationwide, which results in the planting of more than 2 million trees in over 10 states annually. Congrats to the Buskirks.

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Pós-graduação em Agronomia (Proteção de Plantas) - FCA