Adubação superficial com micronutrientes na cultura da soja

Abstract

In recent decades, soybean cultivation techniques in Brazil, especially in the Cerrado, have evolved a lot. The proper management of soil fertility has contributed significantly to productivity gains and to the expansion of planting in this region. The supply of micronutrients is essential for the proper development of soybean crops. Thus, this work aims to evaluate the effect of the application of increasing doses of micronutrients applied superficially, in the components of production of the soybean crop, in the region of Nova Mutum - MT. For this, 5 experiments were conducted during the 2017/2018 harvest. The sources and doses were: Zinc Sulfate: 0, 4, 8, 12, 24 kg ha-1 ; Manganese Sulfate: 0, 4, 8, 12, 24 kg ha-1 ; Borogran: 0, 3, 6, 9, 12 kg ha-1 ; and Copper Sulfate: 0, 3, 6, 9, 12 kg ha-1 . The soybean cultivar PIONEER® 98Y30 RR was used, spaced at 0.5m. At the time of harvest, done manually, in the center of the plot, 10 plants were randomly harvested for evaluations of mass of a thousand grains and number of pods per plant. To estimate the plant stand and calculate the productivity, 10 linear meters (2 rows of 5 meters) were evaluated. Data were submitted to analysis of variance using the F test at 5% significance. Under the conditions of this study, the use of the micronutrients studied did not interfere with soybean productivity.