Potencial forrajero y valorización nutritiva de los pastos Brachiaria Decumbens y Tanzania con diferentes niveles de fertilización nitrogenada

Abstract

The agronomic performance and nutritional assessment was evaluated in two species of grass Brachiaria decumbens and panicum maximum variationTanzania in cutting ages 21,42, 63, and 84 days, as a result of different levels of nitrogen fertilization application(25, 50, 75 and 100 kg N/ha). 20 plots of 21m² each were used and distributed under a randomized complete block design (RCBD). The results were analyzed using ANOVA (Analysis of Variance) and mean separation test with Ducan. It was determined that the used levels statistically influenced the answers, but did not present a defined behavior according to the cutting periods; however, the Brachiaria decumbens when using 100 kg/ha, showed forage production in 21 days of 3449.06 kg DM/ha/cut and in 84 days 6116.28 kg/DM/ha/cut. In the Panicum maximum production was 2447.62 and 3655.74 kg DM/ha/cut in the same periods. According to the economic analysis, it is recommended to cut the grass in 21 days, using a fertilization of 75 kg N/ha in Brachiaria decumbens because it gets a B/C of 2.75; for the Panicum maximum 100 kg N/ha must be used, since its profitability was B/C 1.97.