Cultivo de genótipos de feijão caupi sob irrigação com águas salinas em fases fenológicas.

Abstract

A major problem faced by farmers around the world is the quality of irrigation water, mostly water with high electrical conductivities, this very problem faced in Brazil, especially in the Northeast. The cowpea, also known as bean-to-string-bean or cowpea, constitutes the main subsistence crop in North and Northeast Brazil. Thinking it aimed to this research to evaluate the cultivation of cowpea genotypes irrigated with saline water at different growth stages, being developed in a greenhouse at the Federal University of Campina Grande, using a completely randomized design with five replications in a combination of two factors: salinity in irrigation water (0.8 dS m-1 and 5.0 dS m-1) and two cowpea (BRS - Itaim and BRS- Xiquexique) at four growth stages (V3, V6, R1 and R3) totaling 80 experimental units. The salinity in irrigation water caused damage to both cowpea genotypes studied. The phenological stage V3 the most tolerant to salinity in irrigation water and R1 and R3 the most sensitive stages. The genotypes behaved differently, depending on each phenological stage.