Manejo da adubação foliar aumenta a produtividade e o teor de nutrientes em grãos de soja?

Abstract

Soybean is among the most relevant crops for the Brazilian economic scenario, given its extensive cultivated area. Among the various factors that influence the productivity of soybean crops, nutrition plays an important role in the productivity and quality of the grain. In recent years, an increase in the use of foliar fertilization as a way of managing crop fertilization has been observed. In view of the above, the objective of this study was to evaluate the management of the time of foliar fertilizer application on the nutrient content in the grains and its effects on productivity. The experiment was conducted at the Agricultural Sciences Experimental Farm of the Federal University of Grande Dourados, in a Randomized Complete Block Design (RCBD) with 6 treatments (times of foliar fertilizer applications) and five blocks. The soybean cultivar used was BMX Fibra Ipro. Sowing fertilization was carried out using 300 kg of the NPK formula 0-20-20. Nutrient content in the grain, plant stand, number of pods per plant, number of grains per pod, 1000 grains weight, and productivity were evaluated. The timing of foliar nutrient application in soybean crops, aiming to accumulate nutrients in the grains, proved to be more effective in the R3 and R5.1 reproductive stages. The combination of foliar application of nutrients during the V4 vegetative stage and R3 and/or R5.1 reproductive stages increased soybean crop productivity.