Taxa de crescimento relativo da brachiaria brizantha cv. Xaráes e brachiaria brizantha cv. marandu sob fertirrigação nitrogenada

Abstract

The objective was to evaluate the relative growth rate of the Brachiaria brizantha cv. Xaraés and the Brachiaria brizantha cv. Marandu subjected to different dilution of urea in the irrigation water. The experiment was conducted in factorial design considering two species of grassland and 6 nitrogen doses diluted in irrigation water with five repetitions. The nitrogen dilutions were 0, 900, 1800, 3200, 4000 and 4800 mg L -1. A relative growth rate was determined, considering the initial and final point of each growth cycle (first and second cut). In the first cut, the portions that did not receive nitrogen had the highest growth rate. The second cut showed significant differences between Xaraés and Marandu. In the Xaraés pasture and Marandu dilution of 4000 mg L- 1 and 4800 mg L- 1 there was the highest relative growth rate.