ADUBA O BORATADA FOLIAR NA CULTURA DA SOJA

The aim of the study was to evaluate soybean response to boron (B) fertilization leaf at different times and rates of application. The experiment was conducted in Borrazópolis (PR) in the 2008/2009 season. We used the experimental design in blocks with seven treatments and four replications. The treatments were: 1 kg ha-1 of B in the V4 stage, 1 kg ha-1 of B in the R2 stage, 0.5 kg ha-1 of B in the V4 stage and 0.5 of B in the V4 stage, 2 kg ha-1 of B in the V4 stage, 2 kg ha-1 of B in the R2 stage, 1 kg ha-1 of B in the V4 stage and 1 kg ha-1 of B in the R2 stage, beyond the control treatment. We analyzed the content of macro and micronutrients in the leaves, as well as yield, weight of 100 grains, grain number per pod and nutrient content in grains. The results were subjected to analysis of variance (F test) and means compared by Tukey test at 5% probability. There was response from Leaf spray fertilization of B on the concentrations of N and K in the grains. The boron fertilization did not affect the grain yield of soybean.