APLICAÇÃO DE POTÁSSIO VIA FOLIAR EM DIFERENTES DOSES E ÉPOCAS NA CULTURA DA SOJA

Abstract

Soybean (Glycine max) is one of the main agricultural crops in the world. The objective of this work was to evaluate the agronomic and productive characteristics of the soybean crop submitted to different times and doses of application of potassium via foliar application. The experimental design was randomized blocks in a 2x5 factorial scheme, two application times (R3 and R5.3) and five doses of K2O (0; 0.5; 1.0; 1.5 and 2.0 kg ha-1) with four replicates. The analyzed variables were: Plant height; Height of the first pod; Number of stems per plant; Number of reproductive nodes on the main stem; Number of reproductive nodes on lateral stems; Number of total reproductive nodes; Number of total nodes per plant; Number of pods on the main stem; Number of pods on lateral stems; Total number of pods per plant; Number of grains per pod; Mass of a thousand grains and Productivity. For the Productivity variable, it was possible to observe a statistical difference between the times of application of K2O via foliar application in the soybean crop, where the application at R5.3 was statistically superior (2720.58 kg ha-1), with an increase of 9 .71% compared to the application in R3 (2479.85 kg ha-1). Among the Doses, the application of 1.0 kg ha-1 showed higher productivity (2762.72 kg ha-1) than the doses of 0 and 0.5 kg ha-1, and an increase of 22.19% in relation to the control (2260.91 kg ha-1). Applying the regression test for Productivity, the dose that demonstrated the highest productivity was 1.51 kg ha-1.