Fósforo em aplicação foliar na cultura da soja

Abstract

Foliar application of phosphorus in soybean crops can be a complementary source of fertilizer. Therefore, the aim of this study was to evaluate the growth and productivity of soybean grains as a function of foliar application of phosphorus, varying the sources, dosages and application time. The experiment was conducted at the Federal University of Mato Grosso do Sul, Chapadão do Sul campus, with a randomized block trial with seven treatments and four replicates. The MAP1, FG1 and FG3 treatments increased the number of branches of the soybean plants with an average of 6.47 branches, 14.5% more than the control. The MAP2 and MAP3 treatments showed the best results in the dry mass of stems, with an average of 9.06 g per plant, 15.6% more than the control. For thousand grain mass, MAP1, MAP2 and MAP3 achieved the highest average (141.67g), outperforming the control by 3.0%. The highest grain yield (5128.7 kg ha-1) was obtained with MAP2 and MAP3, with an increase of 8.6% compared to the control. The MAP2 treatment also achieved the highest leaf P value, which was 42.0% higher than the 9 control. The conclusion was that the application of MAP on leaves resulted in an increase in growth, production components and grain yield of soybeans, but this depends on the source and dose used. In the trial conducted, the dose that produced the greatest benefits was MAP2 at a dosage of 2 kg ha-1.