LIMA, A. R.; http://lattes.cnpq.br/3104286195300897; LIMA, Anecléia Rodrigues de.
Abstract:
This study was carried out under field conditions at the Experimental Farm of the Agricultural Research Company of Rio Grande do Norte (EMPARN), in Apodi, RN. For determining the crop water consumption of cowpea irrigated, it was used the methods of Penman-Monteith to estimate reference evapotranspiration (ETo), energy balance based on Bowen ratio to estimate crop evapotranspiration (ETc) and the ratio ETc/ETo to determine the crop coefficient (Kc). The experiment was conducted using an experimental plot of 4.0 ha cultivated with cowpea cultivar Potiguar, with 70 cm between rows which resulted a density of 4 plants m-1. The irrigation system sprinkler was used with an efficiency of 60%, which produced a water depth of 463.7 mm at the end of the cycle. The results show that the water requirement of cowpea was higher in the period of vegetative growth (166.91 mm), while for the entire cycle it was 431.86 mm.
