SALINE WATER AND PHOSPHATE FERTILIZATION IN PEANUT CROPS

Abstract

Phosphate fertilization can mitigate salt stress in peanut plants. In this context, the objective of this work was to evaluate the use of saline water at different phenological stages in the productivity of peanuts cultivated under phosphorus fertilization. The experiment was carried out in the experimental area of ​​the Aurora Seedling Production Unit, at the University of Integration of Lusofonia Afro-Brasileira, Redenção, CE. The experimental design was completely randomized, in a 6x2 factorial scheme, with 5 replications, using six irrigation strategies with saline water with electrical conductivity of 4.0 dS m^-1 applied at different phenological stages of the crop: salt stress in the vegetative phase ( E1); in the flowering stage (E2); in the appearance of the gynophore (E3); in fruiting/pod formation (E4); in the final stage of flowering (E5); without salt stress (E6) and two doses of phosphorus 3.1 and 6.2 g pot^-1, corresponding to 50% and 100% of the recommended dose. The variables analyzed were: formed pods, malformed pods, total number of pods per plant, pod length, pod diameter, pod mass and productivity. The use of water with greater salinity in the vegetative phase shows a smaller pod diameter.