Influência de doses e adubações fosfatadas na cultura da soja no município de Uruçuí-PI

Abstract

Brazil was the largest soybean producer in the world in the 2020/21 crop. Therefore, the objective was to evaluate fertilizers formulated as sources of phosphorus and which dose exerts influence for soybean crop in Uruçuí-PI. The trial was carried out between October 2021 and February 2022, at fazenda Condomínio Agrícola Colibri in Uruçuí-PI. The experimental design was randomized blocks with 10 treatments and 3 replications. Each experimental unit corresponds to 54 m2 (6 lines of 20 m), and spacing of 0.45 m between rows. The treatments corresponded to three fertilizers in the formulations 04:32:00, 10:46:00 + 9% S and 12:40:00 + 10% S + 1% Zn+ 0.3% B) and three doses (50%, 100% and 150%). The experiment was carried out using the cultivar Extrema 81I81 RSF IPRO. The doses 100 and 150% of the formulation 12:40:00 positively influenced the height of plants, which may interfere in the productivity, and 150% of the same formulation increased the number of nodes. The fertilizer 12:40:00 at doses 100 and 150% obtained the same averages for the variable 3-grain pod and the dose 150% increased the number of pods per plant and proved effective to increase soybean productivity in kg ha-1 and bags ha-1