Crescimento e desenvolvimento do capim-marandu submetido a doses de nitrogênio e enxofre

Abstract

Among the grasses used for the production of forage, the Brachiaria genus occupy a prominent position for Brazilian livestock and the loss of productivity of these forage species becomes evident when there is no adequate management of establishment and maintenance. Thus, the objective was to study the interaction between Nitrogen (N) and (S) doses in the growth and development of Brachiaria brizantha cv. Marandu. The experiment was conducted in a greenhouse, samples of a dystrophic Red Latosol were used. The combination of five doses of N (0, 100, 200, 300 and 400 mg dm-3 ) with five doses of S (0, 10, 20, 30 and 40 mg dm-3 ) was studied in a fractionated factorial. The plants were cultivated for 60 days after transplanting, and two cuts were performed with a 30-day interval. Height, number of leaves and tillers were evaluated. A interação entre N e S foi significativa para o número de perfilhos e número de folhas no segundo crescimento, onde a maior produção de ambos os parâmetros se manteve em torno de 13:1. The doses of N separately were significant for the first growth, being that, high doses demonstrated a significant increase in the production of tiller and leaves in Marandu grass. The height of the aerial part of the plants had no significant difference. In the interaction, the increment of one nutrient in relation to the other, the S was more influential in relation to the number of tillers in the initial development, and N influenced the number of leaves. The interaction of N and S doses in Marandu grass provided an increase in pasture development parameters. Doses that were close to the 13: 1 ratio promoted maximal morphogenic parameters.