Productivity of Paiaguás grass under nitrogen doses and cuts

Abstract

The objective of this work was to evaluate the dry mass production and other agronomic characteristics of Brachiaria brizantha cv. Paiaguás in different doses of nitrogen (N), in the third year of production. The experiment was carried out at the State University of Mato Grosso, in Tangará da Serra - MT, Brazil. The experimental design was randomized blocks (DBC), with six treatments (0, 50, 100, 150, 200 and 250 kg/ha of N) and four replications. Four cuts were performed and analyzed the variables plant height (AP), number of tillers/m² (NP), dry mass/tiller (MSP), number of leaves/tiller (NFP), percentage of dry mass (%MS), leaf ratio: high (RFC), production of green mass/ha (MV), production of dry mass/ha (MS), dry mass of leaves/ha (MSF), dry mass of stems/ha (MSC), dry mass of senescent material/ha (MSMS). Data were submitted to analysis of variance by the F test and, when they showed significance, the regression analysis was performed with the ASSISTAT program. Plant height, number of tillers/m2, green mass and dry mass/ha, leaf dry mass, stems dry mass and dry mass of senescent material/ha of Paiaguás grass, differed statistically and increased with the addition of nitrogen doses up to 250 kg/ha of N. The percentage of dry mass reduced with the increase of the nitrogen doses. The variables number of leaves/tiller, dry mass/tiller and leaf ratio: high did not respond to the doses of N. Thus, it is concluded that nitrogen doses significantly increase the productive characteristics of B. brizantha cv. Paiaguás, in the third year of production, with satisfactory results in the dose of 200 kg/ha of N.