USE OF BLENDS OF SILICATE AGROMINERALS AS A K SOURCE FOR SOYBEAN CROPS
This study aimed to test the efficiency of blends of silicate agrominerals as K sources for soybean crops. The experiment was conducted in the surroundings of Embrapa Cerrados, Planaltina – DF (TN: city in the Midwest, Brazil), in two field areas with similar climate conditions and different soil types: a medium texture soil and a clay soil. The experiment was carried out in 6 random blocks, with the following treatments: syenite and biotite schist (silicate rocks), and potassium chloride (conventional fertilizer), in doses of 0 kg, 60 kg, 120 kg, 240 kg, and 480 kg of K2O ha-1. The soil was prepared and the treatments on each plot were manually distributed and incorporated into the soil (up to 20 cm). The average yield was low, fluctuating from 500 to 1110 kg ha-1, however, all rocks showed higher results than the control treatment. The treatment with KCl showed a higher K absorption compared to the other treatments.
Original (Portuguese) version: ” USO DE MISTURA DE AGROMINERAIS SILICÁTICOS (BLENDS) COMO FONTE DE K PARA A CULTURA DA SOJA”