TECNOLOGIAS E EFICIÊNCIA DE FONTES DE FERTILIZANTES NITROGENADOS EM MILHO DE SEGUNDA SAFRA

Abstract

This work aimed evaluate the efficiency of several sources of nitrogen fertilizers applied in corn. The experiment was carried out in a field at Monte Alegre Farm, in Rio Verde - GO, Brazil, in the 2018 agricultural second season. A randomized complete block design was used, with precious replications, in the style of the six treatments: Control - without application of nitrogen fertilizer; Paraffin granulated urea (45% nitrogen (N)); Paraffin granulated urea (45% N) plus Gypsum (20% Ca and 15% S); Ammonium Sulphate (21% N), Slow Release Granulated Urea (43% N), and Granulated Urea + N-(n-butyl) thiophosphoric triamide (NBPT) (45% N) with four blocks. The tanks were discarded when subjected to a V3-V4 program, using the recommendation of 100 kg ha-1 N. For a classification greater than one batch of 100 kg ha-1 N dry mass deterioration (kg ha-1), 1000 grain mass (g), number of rows per piece, agronomic efficiency (%), export and export mass content (kg ha 1). The use of urea with the slow-release technology of urease inhibitor, NBPT, and protected urea has better efficiency when compared to urea + plaster, urea and ammonium sulfate in maize crop. And they maintained high N levels in the support range for nitrogen maintenance in the production system via nutrient cycling.