ÉPOCAS DE APLICAÇÃO DE POTÁSSIO NA SOJA NO LESTE GOIANO: UM ESTUDO FITOTÉCNICO

Abstract

Over the years, several factors have been studied and responsible for the increase in the levels of expansion, yield and success of the soybean crop. Among these factors, the management of the soil system and, in particular, potassium fertilization are important. This study aimed to evaluate the timing of potassium application in the soybean variety cv. Desafio RR. The experimental design used was randomized blocks in a 5x2 factorial, totaling 10 treatments, corresponding to five doses of potassium chloride (0, 100, 200, 300 and 400), at two times of application in the crop (15 days before and 15 days). days after sowing), in 4 repetitions. The sowing took place following commercial farming patterns in the eastern region of Goiás. During the execution of the experiment, pest, disease and weed control were carried out whenever necessary, respecting good practices and integrated management. Variables were analyzed after harvest. The results were subjected to analysis of variance, performing polynomial regression and comparison of means by Tukey test at 5% probability. Potassium fertilization performed fifteen days before sowing in soybean cv. Challenge RR, better satisfies the phytotechnical components, being recommended at a dose of 185 kg ha-1.