Evapotranspiration and crop coefficients of corn in monoculture and intercropped with jack bean/ Evapotranspiracao e coeficientes da cultura do milho Caatingueiro em monocultivo e consorciado com feijao-de-porco

This study was carried out to determine the evapotranspiration (ETc) and crop coefficients (Kc) for four stages of "Caatingueiro" corn under the climate condition of Seropedica, RJ, Brazil, using weighing lysimeters. The field trial occurred in 2015, from March 18 to June 25, in two areas...

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Bibliographic Details
Published in:Revista brasileira de engenharia agrícola e ambiental 2017-01, Vol.21 (1), p.27
Main Authors: de Araujo, Mario S.P, de Sousa, Elias F, Pereira, Vinicius R, Ferreira, Fernando H.A, de Carvalho, Daniel F
Format: Article
Language:English
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Summary:This study was carried out to determine the evapotranspiration (ETc) and crop coefficients (Kc) for four stages of "Caatingueiro" corn under the climate condition of Seropedica, RJ, Brazil, using weighing lysimeters. The field trial occurred in 2015, from March 18 to June 25, in two areas cultivated with "Caatingueiro' corn intercropped with jack bean and in monoculture. The reference evapotranspiration (ETo) was estimated by the FAO-56 PenmanMonteith model and the Kc values were determined by the ratio between ETc and ETo. The Kc values obtained for the intercropping and monoculture systems, were respectively: 0.78 (I); 1.01 (II); 1.10 (III) and 1.01 (IV), and 0.62 (I); 0.92 (II); 1.27 (III) and 0.81 (IV), and they were different from the values presented by FAO. Key words: water requirement weighing lysimeter irrigation organic cultivation Objetivou-se, neste trabalho, determinar a evapotranspiracao (ETc) e os coeficientes de cultivo (Kc) para as quatro fases de desenvolvimento do milho Caatingueiro nas condicoes edafoclimaticas de Seropedica, RJ, utilizando lisimetros de pesagem. O experimento foi realizado de 18/03 a 25/06/2015, em areas cultivadas com o milho Caatingueiro consorciado com feijao-de-porco e em monocultivo. A evapotranspiracao de referencia (ETo) foi estimada pela metodologia Penman-Monteith FAO-56 e os valores de Kc determinados pela razao entre ETc e ETo. Os valores de Kc para o consorcio e o monocultivo foram, respectivamente: 0,78 (I); 1,01 (II);1,10 (III) e 1,01 (IV) e 0,62 (I); 0,92 (II); 1,27 (III) e 0,81 (IV) que se diferenciaram dos valores apresentados pela FAO. Palavras-chave: demanda hidrica lisimetro de pesagem irrigacao cultivo organico
ISSN:1415-4366
1807-1929
DOI:10.1590/1807-1929/agriambi.v21n1p27-31