Fontes de Nitrogênio mineral em milho para produção de silagem

Abstract

The objective of this work was to evaluate if the different sources of nitrogen and the additives improve the productivity of green corn mass and if they are more viable when compared with urea. The experiment was carried out in 2019 in Ubiretama-RS, in an Rhodic Ferralsol, with a completely randomized design with plots of 6 x 8 m, with 5 treatments and 4 repetitions. The treatments were nitrogen fertilizers (dose of 100 kg ha-1 of N in cover) urea, ammonium nitrate, urea plus urease inhibitor (NBPT), ammonium sulfate plus nitrification inhibitor (DMPP) and control without nitrogen application in coverage. Applications were split in 50% between stages V3 and V4 and 50% between stages V7 and V8. Assessments of plant height and ear insertion, stem mass, leaves and ears, number of rows of grains per ear, number of green and dry leaves, stem and ear diameter, ear length and green mass were carried out. The application of nitrogen in coverage increased the productivity of green mass, the treatment with urea showed the highest productivity of green mass, differing statistically from the treatment where there was no application of nitrogen in coverage, this treatment also showed the best economic viability, a contradictory result than expected.