Water deficit on the growth and yield of irrigated soybean in the Brazilian Cerrado region/Deficit hidrico no crescimento e produtividade de soja irrigada na regiao do Cerrado brasileiro.

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Publisher: ATECEL--Associacao Tecnico Cientifica Ernesto Luiz de Oliveira Junior
Document Type: Article
Length: 5,887 words

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Abstract :

HIGHLIGHTS: When necessary, it is possible to reduce the irrigation depth by up to 60% without major reductions in soybean yield. There was no significant decrease in soybean yield from 80 to 100% available water in the soil (AW) and from 60 to 80% AW The highest grain yield per cubic meter of water applied was obtained in winter, for the water deficit between 20 and 40%. The increase in disputes over water use in the Brazilian Cerrado has demanded improvements in irrigation management and increase in water use productivity. In this context, deficit irrigation is an interesting management strategy, as it enables water savings without significant losses of yield. The present study aimed to evaluate the phenology and yield of a soybean cultivar subjected to different soil moisture contents. The experimental design used was randomized blocks with five treatments and four replicates. In each treatment, an irrigation strategy was applied based on the available water in the soil (AW). The Tl treatment was performed by applying from 80 to 100% AW; in T2 treatment, the allowed variation was from 60 to 80% AW; in T3 treatment, it was from 40 to 60% AW; in T4, from 20 to 40% AW; and in T5, from 0 to 20% AW. It was verified that, in winter and summer, even without the need to reduce water withdrawal, it is recommended to apply from 60 to 80% of the available water in the soil for soybean crop, without decreasing yield. In situations of water restriction, it is possible to have yield of around 55 and 70% in winter and summer, respectively, for the condition from 20 to 40% of the available water in the soil. Keywords: Glycine max L., water stress, irrigation management, evapotranspiration O aumento das disputas pelo uso de agua no Cerrado brasileiro, tem demandado melhorias no manejo de irrigacao e aumento da produtividade de uso da agua. Neste contexto, a irrigacao com deficit se apresenta como uma estrategia de manejo interessante, possibilitando economia de agua sem prejuizos significativos a produtividade. O presente estudo teve como objetivo avaliar a fenologia e produtividade de uma cultivar de soja submetida a diferentes condicoes de deficit hidrico no solo. O delineamento experimental utilizado foi em blocos casualizados com cinco tratamentos e quatro repeticoes. Em cada tratamento, uma estrategia de irrigacao foi aplicada com base na agua disponivel no solo (AD). O tratamento Tl foi realizado aplicando 80 a 100% AD; no tratamento T2, a variacao permitida foi de 60 a 80% AD; no tratamento T3, foi de 40 a 60% AD; em T4, de 20 a 40% AD; e em T5, de 0 a 20% AD. Verificou-se que tanto no inverno quanta no verao, mesmo sem a necessidade de reducao da retirada de agua, e recomendavel aplicar 60 a 80% da agua disponivel no solo para a cultura da soja, sem diminuir a produtividade. Em situacoes de restricao hidrica, e possivel ter produtividade em torno de 55 e 70% no inverno e no verao, respectivamente, para a condicao de 20 a 40% da agua disponivel no solo. Palavras-chave: Glycine max L., estresse hidrico, manejo de irrigacao, evapotranspiracao

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Gale Document Number: GALE|A674989393