Potassium fertilization and bioactivators on the soybean yield and soil microbiota

ABSTRACT Soil microorganisms are of paramount importance for crop yield. This study aimed to evaluate the effect potassium chloride doses associated with two bioactivation sources on soybean yield and soil microbial activity. The experimental design was randomized blocks, arranged in a 5 x 2 factorial scheme, four replications, being first factor (0, 30, 60, 90 120 kg ha-1 K2O), using as source, second products: Penergetic (250 g ha-1) Efficient Microorganisms (EM) (1:250), 250 L spray volume. KCl affected activity, while bioactivating did not show significance leaf content K2O higher than maintenance dose EM negatively influenced biomass. bioactivator K (60 is most appropriate treatment it condition that presents stable environment highest efficiency.