Agronomic performance of soybean genotypes supplemented with micronutrients via leaf

Abstract

Foliar fertilization, mainly with micronutrients, is one of the tools most recommended by researchers and professionals to growers in order to correct nutritional imbalances in crops. This work aimed to evidence the agronomic performance of soybean genotypes supplemented via leaf with micronutrients and to identify the relationships between characters. The experimental design used was in randomized blocks in a 3x5 factorial scheme corresponding to three soybean genotypes ANTA82, CD2737 and N7902 and five concentrations of leaf supplement, Triplus Anuais® with its guarantees of phosphorus 2%, boron 3.4%, molybdenum 1 % and nickel 0.35%. The leaf supplement was applied in a single dose during pre-flowering (0, 300, 600, 900 and 1200 ml ha-1). The variables were analyzed after the plants were harvested at the physiological maturation stage and the data were submitted to the assumptions of the statistical models. Analysis of variance was carried out with subsequent splitting with grouping of Scott-Knott means and polynomial regression models, in addition to simple correlation and path analysis, with grain yield as the main variable and the other variables as explanatory. The different performances of soybean genotypes were verified when submitted to foliar supplementation of micronutrients with adjustment of the most efficient dose for yield, through the regression curves. That supplementation via leaf with micronutrients in the pre-flowering phase was efficient for all soybean genotypes analyzed. However, it is worth mentioning the high yields obtained by the NS 7209 IPRO genotype at a dose of 514.23 ml ha-1. The selection of productive soybean genotypes can be performed indirectly by the number of legumes, grains per plant and the weight of a thousand grains.