Potencial forrageiro do capim Mombaça fertilizado com diferentes doses de nitrogênio

Abstract

Panicum grasses are characterized by their great potential of forage production. Among the many cultivars, it is highlighting the Panicum maximum cv. Mombaça that acquired great importance in the cultivated pasture areas of the country. The objective of this study was to evaluate the Mombaça grass development, previously deployed in the area formerly used in corn and soybeans, fertilized with different doses of nitrogen (N), determining their forage production throughout the year. It was used the experimental design of randomized blocks with three repetitions. The treatment were realized with four doses of nitrogen (N) 0, 120, 240 and 360 kg/ha/year, using the urea as the N font (45% N). The cut were made 30 cm from the ground with an average interval of 32 days, totalling 7 cuts along of all experiment. Nitrogen fertilization was carried out in sections after the cuts in order to achieve the levels proposed by the treatments. It was observed significative effects in the different doses of N in dry matter production (PMS), cutting height of the grass, leaf production, stem production and accumulation rate of Mombaça grass. The average production of dry matter totalled 10.235 kg/ha with an average accumulation rate of 49,03 kg/ha/day. The average cutting height was 0.71 meters, while the average residual height was 0.31 meters. On average, the leaf participation in the forage above 0,30 m was 90,65% and an average stem participation of 5,44%. The urea fertilization increased in a linear form the total production of dry matter and the morphological components of the plant.