Efeito de inibidor de urease no desempenho de híbridos de milho

Abstract

Mato Grosso has the largest production of corn in Brazil and uses urea as a source of nitrogen, which causes environmental problems due to its volatilization. Therefore, the objective of this study was to evaluate whether the presence of urease inhibitors in formulations containing urea and ammonium sulfate influences the response of different commercial corn hybrids in the Sinop MT region. The experimental design was in randomized blocks, in a 3 x 5 factor scheme with three repetitions. Three coverage fertilizers: control, without application of coverage fertilizer; coverage fertilization with 250 kg ha-1 of the formulated 25-00-18; coverage fertilization with 250 kg ha-1 of the formulated 25-00-18, with presence of the urease inhibitor, commercial name UREMAX® NBPT. The second factor with five corn hybrids, being them: Syn 522 VIP3, NS45 PRO2, 2B433 PW, DKB 255 VT PRO3 and DKB 335 VT PRO3. The most outstanding Hybrid in productivity was DKB 255 VT PRO3, which reached 160 bags ha- 1, with coverage fertilization with the presence of Uremax®, about 31% more than the treatment without coverage urea, and with gains of 18% compared to urea. The study resulted in differences for all hybrids when the urease inhibitor was applied compared to the treatment without coverage. In the DKB 255, 2B433 and SYN 522 hybrids, treatment with Uremax® was superior to urea.