Aplicação foliar e via sementes de micronutrientes sobre a nodulação na cultura da soja

Abstract

Lately, new inoculants are being developed with the intention of increasing productivity. This work aims to verify three products, with different compositions of micronutrients that can be tested in different applications and quantities for the development of nodules in soy roots. The experiment was carried out near the city of Sinop - MT, located on Rodovia João Adão Scheeren. The work was carried out with the soybean cultivar Bonus. The products were applied separately and together among the treatments. The cultivar was sown in a randomized block design, in 6 blocks and 6 treatments. The nutrient mixtures used had the following composition: Treatment A: 1% P2O5, 2.4% Ni, 1.2% Co and 26% Mo; Treatment B: 0.9% Ni, 0.45% Co and 9% Mo; Treatment C: 4% K2O, 6% P2O5, 1% Mg, 1.5% Ni, 0.5% Co, 10% Mo, 6% Zn and 1.3% S. In treatment 1 - 100g/ha of product A via seed treatment (TS), treatment 2 -150mL/ha of product B, via TS, treatment 3 - 120g/ha of product A via foliar, treatment 4 - 300g/ha of product C via foliar, treatment 5 -100g/ha of product A via TS + 120g/ha via foliar, treatment 6 -150mL/ha of product B + 300g/ha of product C via foliar. The vegetative parts of the plants and the roots were analyzed by counting nodules and measuring the volume and size of the roots. The results were submitted to variance analysis and the means were compared using the Tukey 10% test. The applications of product B and C showed results in the variable number of nodules. On the other hand, the applications did not influence the final productivity, showing an average of 73 sc/ha.