Agronomics characteritcs of wheat cultivars in response to urea treaded with urease inhibitor in coverage

Reductions of nitrogen losses applied in coverage on the wheat crop is a necessity in the national wheat production, this advanced can increase grains yield, and for this, the use of nitrogen sources enriched with urease inhibitors can be a alternative for producers. In this context the objective of this study was to verify the different nitrogen fertilizers efficiency, with and without urease inhibitors, in coverage on the wheat crop and its effects on the expression of agronomics traits. The experiment was conducted in Guarapuava on the season of 2012, in the Experimental Camp of the Agronomy Department of the Universidade Estadual do Centro-Oeste of Parana - UNICENTRO. The used design was of randomized blocks with five replications, in 3x2 factorial, being 3 traits of nitrogen coverage (control treatment, conventional urea and urea with urease inhibitor - NBPT), and 2 wheat cultivars (Mirante (R) e BRS Pardela (R)). There was significant difference between traits with nitrogen fertilizer for the assessed characteristics: Tillers number (NP), grains number for ears (GE), weight of a thousand grains (P1000) and grains yield (PROD). The results of this study allow to conclude that there was increase in the wheat grains yield when associated to the used coverage fertilizer with uerase inhibitor NBPT (200 kg ha(-1) - 90 kg N), in face of the other evaluated treatments. The urea with urease inhibitor NBPT provided higher weight of a thousand grains when compared with conventional urea, being the result dependent of the evaluated cultivar.