Distribuição da umidade num perfil de solo irrigado por gotejamento superficial e subsuperficial

Souza, Elves de Almeida; Coelho, E. F.; Paz, Vital Pedro da Silva

doi:10.1590/s1413-70542007000400032

Cited by 8 publications

(5 citation statements)

References 7 publications

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“…This result corroborates with study by SOUZA et al (2007), which is found that occurred leaching of the solution and stabilization of the wet surface area on sandy soil when applied frequent irrigation depth, after a period of 6 hours and a flow rate of 1 L h -1 . Different results were observed by BARROS et al (2009), who concluded that the high frequency irrigation, in Red Nitosols did not promote stabilization of the wetted area being the emitter positioned on surface or 0.10 m depth.…”

Section: Resultssupporting

confidence: 92%

Distribution of water in sandy soil applied by drip

Gonçalves¹,

Alves²,

Marques³

et al. 2014

Eng. Agríc.

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The search for the use of water with high levels of efficiency has motivated the use of drip irrigation in several agricultural systems. However, for the efficiency be ensured, it is necessary that the water distribution in the soil profile must to be known in more details. As it is a highly variable process, function of the local characteristics, is essential the study of each case. The objective of this research was evaluating the water distribution in the soil profile, from drippers installed in surface and 0.15 m below the soil surface. The experiment was realized in the Technical Center of Irrigation (TCI) of the State University of Maringá - PR. The water monitoring in the soil profile was done with TDR probes installed in a box containing sandy soil, at the depths from 0.05 to 0.80 m; and 0.05 to 0.35 m of lateral spacing, at intervals of 0.05 m, totalizing 30 probes. The treatments were differentiated in relation of the installation depth of the emitters (0.0 and 0.15 m) and flow (1, 2, 4, 6, and 8 L h-1). The irrigation time was 8 hours continuous with reading of the TDR probes each 30 minutes. The results allowed concluding that the wet area with the emitter positioned on the soil surface was directly proportional to the flow increase. For the underground dripper, this area was substantially smaller and the water losses by percolation were higher, mainly to the flows higher than 4 L h-1, which provided to unacceptable water losses that should be avoided.

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Section: Resultssupporting

confidence: 92%

Distribution of water in sandy soil applied by drip

Gonçalves¹,

Alves²,

Marques³

et al. 2014

Eng. Agríc.

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“…This can be explained by the fact that water tends to move to the soil surface before the infiltration-percolation process begins. Analyzing Figures 1A and 2A, it is observed that the bulb radius was smaller than its depth; similar situation was observed by Souza et al (2007). In Figure 1A, it is verified that the radial distance achieved by the wetted surface was 18 cm, wherein Rivera (2004) and Nogueira et al (2000), applying water by surface drip, obtained radial values of 35 and 25 cm, respectively.…”

Section: Resultssupporting

confidence: 76%

Wet bulb dimensions associated with different flow and terrain declivity

Souza¹,

Moreira²,

Salomão³

et al. 2018

Afr. J. Agric. Res.

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Geometry information of wet bulb is important for the design of projects and management of drip irrigation, mainly to estimate the volume of wet soil, emitter flows and irrigation time. This study aims to determine the dimensions of wet bulb formed by drippers with different flow and terrain declivities. For this, soil moisture levels were determined throughout the soil profile after drip irrigation with three flow emitters associated with four terrain declivities. It was verified that when the terrain was in level, there was greater radial migration of water on the soil surface with increase in the flow dripper, resulting in more open wet bulbs. On the other hand, increases in flow and declivity provide lower vertical percolation of water, obtaining smaller depth of moisture in the soil profile. Therefore, different terrain declivities and flow drippers influence wet bulb geometry and moisture distribution, indicating the importance of relief in the positioning of emitters in drip irrigation.

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“…Uma variante ao sistema de gotejamento tradicional é o gotejamento subsuperficial. De acordo com Souza et al (2007) o sistema de irrigação por gotejamento subsuperficial apresenta algumas vantagens em relação ao superficial, tais como: aumento substancial na eficiência de irrigação e maior durabilidade e a redução da área de evaporação de água a partir da superfície do solo. Entretanto, esta variante do gotejamento pode aumentar o risco potencial de entupimento devido à entrada de partículas de solo e/ou intrusão radicular nos emissores.…”

Section: Introductionunclassified

Diferentes Tipos De Água E Seu Efeito Na Uniformidade De Gotejadores Na Cultura De Tomate

Thebaldi

Sandri

Rocha

et al. 2013

R_I

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O sistema de irrigação mais apropriado na aplicação de efluentes tratados é o gotejamento, pois não há o risco de contaminação dos frutos e parte aérea da planta e menor possibilidade de contaminação dos agricultores e consumidores, além da economia de água e energia, apresentando, como limitação, a suscetibilidade ao entupimento. Este trabalho teve como objetivo avaliar a uniformidade de aplicação de água na irrigação por gotejamento superficial e subsuperficial, antes e após um ciclo da cultura do tomate de mesa irrigado com água residuária tratada proveniente de abate de bovinos, fertirrigação convencional e água natural de um córrego. Os ensaios de vazão por emissor foram realizados em três linhas de cada combinação de água e tipo de gotejamento, em um total de 12 gotejadores por lateral, nos emissores novos e após 90 dias do ciclo da cultura. Com as vazões, foram calculados o CUC, CUD e CUE de cada tratamento. Houve maior redução dos valores de CUC, CUD e CUE na irrigação com água residuária e gotejamento enterrado. Após o ciclo da cultura do tomate o CUC foi classificado como excelente,o CUD como bom e o CUE como excelente para a maioria dos tratamentos.

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Distribuição da umidade num perfil de solo irrigado por gotejamento superficial e subsuperficial

Cited by 8 publications

References 7 publications

Distribution of water in sandy soil applied by drip

Distribution of water in sandy soil applied by drip

Wet bulb dimensions associated with different flow and terrain declivity

Diferentes Tipos De Água E Seu Efeito Na Uniformidade De Gotejadores Na Cultura De Tomate

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