Agronomic performance of peanut genotypes under saline stress and different forms of fertilization

Abstract

The depressive effects caused by salt stress are responsible for the decrease in crop productivity in arid and semi-arid regions. However, these effects can be minimized with different management strategies, such as the use of genotypes and forms of fertilization. In this context, the objective was to evaluate the productivity of two peanut genotypes, submitted to increasing levels of salinity and two forms of fertilization. A completely randomized design (DIC) was used, making use of the factorial scheme 3 x 2 x 2, with 4 repetitions. The first factor corresponded to the salinity levels of the irrigation water (1.0; 3.0; and 5.0 dS m-1). The second factor comprised two genotypes (Access 26 and Access 8) and the third factor corresponded to two types of fertilization (mineral, with NPK; organic, with bovine biofertilizer). The following variables were evaluated: pod length, pod diameter, pod number, dry peel mass, dry pod mass and productivity. Irrigation with 1.0 dS m-1 electrical conductivity water did not inhibit the production components of the peanut genotypes regardless of the type of fertilization. Access 26 when fertilized with bovine biofertilizer and irrigated with high salinity water was more efficient than access 8, showing a higher number of pods, dry pod mass and productivity. The use of mineral fertilizer was not able to mitigate the harmful effects of high salinity water, affecting the number of pods, pod dry matter and the productivity of both genotypes.