INFLUÊNCIA DE FERTILIZANTES FOSFATADOS DE LIBERAÇÃO LENTA NA PRODUTIVIDADE DA SOJA NO CERRADO

Abstract

Two experiments were carried out in order to evaluate soybean productivity under phosphate fertilizer sources, one of which was the experiment with different sources and technologies for the protection of phosphate fertilizers, and the other, the fifth crop of the long-term experiment with increasing doses of monoammonium phosphate (MAP) and MAP fertilizers with Kimcoat technology which configures slow release. The design of the experiment with technologies was in randomized blocks with eight treatments, with four replications. Each experimental unit was composed of 6 soybean lines, spaced 0.5 m apart, by 4 meters in length, totaling 12 m² of total area. For the dose experiment, the design was randomized blocks in a 5 x 2 factorial scheme, with five doses of fertilizers (0, 54, 108, 162, 216 and 270 kg ha-1 of P2O5) and two sources (monoammonium phosphate - MAP - 11% N and 52% P2O5 and monoammonium phosphate with Kimcoat technology - MAPKP - 10% N and 50% P2O5), with four repetitions. Each experimental unit was composed of 6 soybean lines, spaced 0.5 m apart, by 4 meters in length, totaling 12 m² of total area. For the evaluations, 2 lines and 1 m from each end were disregarded, totaling 2 linear meters of usable area. One linear meter was collected separately, totaling two evaluations per experimental unit. As a main result, it was found that there is an increase in soybean grain productivity with the increase in the doses of phosphate fertilizers.