Uso do potássio protegido na cultura de soja

Abstract

Soils in the region south of Mato Grosso, usually deficient in potassium (K), when cultivated with soybean (Glycine max L.) require potassium fertilization for obtaining satisfactory productivity. These soils, with sandy texture characteristic when submitted to the intense potassic fertilization, present major indexes leaching losses, requiring split fertilization. This study aims to evaluate the treatment effect of different doses of protected potassium in productive behavior and quality of soybean seeds. The experiment was performed in the field in randomized blocks design with seven treatments and four replications. Plant height, fresh weight of aerial part and dry weight of aerial part, productivity and weight of one thousand seeds at 14% humidity were evaluated and the seeds were tested for germination and vigor. The best productivity was obtained with treatment based on Potassium Chloride, the fresh weight of obtained positive responses with the mixture of KCl and protected potassium in the proportions of 80% and 40%, the dry weight of aerial part had significantly higher results with the mixture of KCl and protected potassium in the proportions of 80%.