Salt stress and water stress in maize cultivation in the semi-arid region

Le résumé fourni par la source

ABSTRACT Water deficit associated with salt stress can affect maize (Zea mays L.) yield. In this context, the objective of this study was to evaluate the yield aspects of maize irrigated with lowerand higher-salinity water and under suppression intervals. The experiment was carried out at the Piroás Experimental Farm, Redenção, Ceará, Brazil. The experimental design used was randomized blocks, in a 2 x 4 factorial arrangement, with the first factor being two levels of electrical conductivity of the irrigation water (0.8 and 3.0 dS m-1) and the second factor being four suppression intervals (NS: no suppression intervals; SI10 = suppression intervals from 40 to 55 DAS (V10 to V14); SI15 = suppression intervals from 50 to 65 DAS (R1); and SI20 = suppression intervals from 65 to 80 DAS (R2 to R4)), with four replicates. The following variables were evaluated: unhusked ear mass, husked ear mass, 1000-grain mass, number of grains per row, ear diameter, ear length, and yield. Salt stress negatively affects unhusked and husked ear mass, number of grains per row and ear length. Suppression intervals SI10, SI15, and SI20 had a negative effect on unhusked and husked ear mass, number of grains per row, and ear length. Salt stress and suppression intervals SI10, SI15 and SI20 negatively affected maize performance in terms of 1000-grain mass and yield.

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