Características estruturais e produtivas de forrageiras do gênero Urochloa submetidas a diferentes níveis de adubação nitrogenada e potássica

Abstract

The objective was to evaluate the production performance of forage species of the genus Urochloa submitted to different doses of nitrogen and potassium. The work was carried out in the Beef Cattle Sector of the School of Veterinary Medicine and Animal Science of the Federal University of Northern Tocantins – Campus de Araguaína. The experiment was conducted in a completely randomized design with a factorial arrangement 2 x 2, with 3 repetitions. The cultivars Xaraés and Piatã were submitted to two levels of NK fertilization (120:40; 60;10, respectively, de N:K2O). There was no effect of interaction between the forages and fertilization for any of the variables, and distinct effects appeared only among the forages. The two cultivars showed similar forage and leaf blade accumulation, however, the Xaraés cultivar showed greater height, less stem accumulation, higher percentage of leaves and a higher leaf:culm. Cultivar Piatã obtained lower responses when compared to Xaraés grass, but reached a higher number of leaves per tiller. However, the fertilization doses showed similar responses. Showing difference only between cultivars, where the cultivar Xaraés reached better responses.