Efeito da aplicação de boro na nutrição e na produtividade da soja

Abstract

Soybean (Glycine max) is one of the most produced crops in Brasil due to its high productivity and high nutritional requirements. Boron (B) is considered a micronutrient and has a narrow range between the amount to meet the nutricional needs of the plant and the amount that can cause toxicity, so the boron fertilization must be adequate, avoiding causing stress due to nutritional disorder. This study aimed to evalute the effect of soil application of B doses in soyben plantes, to determine whether this nutrient promotes increased gain produvtion, due to improved plant nutrition. The tretments consisted of 5 doses (0; 1,5; 3; 4,5; 6 kg ha-1) of boron, for which, the source of boric acid was used. Analyzed of leaf boron, soil boron and grain yield were carried out in order to improve production through micronutrient supplementation in the soil. As indicated in the study, the maximum grain production occurred when the dosage was close to 3,5 kg ha-1, in addition to that, the results showed that with an excessive dosage, boron becomes toxic to the plant caused productivity to retum to fall when the foliar boro concentrarion exceeds the of 83 mg kg-1 observed in dosages greater than 4,5 kg ha-1.