ACUMULATION OF INORGANIC SOLUTIONS OF CAUPI BEANS IRRIGATED UNDER SALT AND WATER STRESS

Abstract

This work evaluated the foliar accumulations of potassium, sodium and chloride of two cultivars of cowpea under the influence of different concentrations of salts in the irrigation water associated to two water regimes, 50% and 100% of the ETpc. The experiment was carried out in pots, in full sunlight, in the experimental area of ​​the Agrometeorological Station of the Federal University of Ceará, Fortaleza, Ceará, Brazil, through an experimental design of randomized blocks in sub - divided plots. Water regimes, considered plots, were based on the potential evapotranspiration of the crop (100 and 50% of ETpc). However, the concentrations of salts of irrigation water (0.95, 2.45, 3.95, 5.45 and 6.95 dS m^-1) were distributed in the subplots while the cultivars Epace 10 and BRS Itaim, in the subsubparcels . The contents of the K⁺ ion in the leaves of the cowpea were higher under conditions of lower water availability. The accumulation of Cl- in leaves of the common bean accompanied the increase of the concentration of salts of the irrigation water, independent of the irrigation management (50 and 100% of the ETpc). Epace cultivar was more efficient in the compartmentalization of Cl^- ion.