Efectos de tres niveles de fertilización en praderas establecidas de Brachiaria decumbens a base de Nitrógeno en la producción de forraje en el cantón San Miguel de los Bancos

Abstract

An experiment in an ultisol characterized as a sandy-loamy, with a 5.5 pH was carried out to determine the effect of nitrogen (N2) and the age (E) on the green forage production (PFV), the dry matter yield (MS), the percentage content of raw protein (PC), the load capacity (CC) and the theoretical calculated milk production in meadowlands established with Brachiaria decumbens. An at random-block design in 16 experimental units was used. The treatments were: 100; 200 and 300 kg N2/ha and a control. The experimental measurements were carried out at 18, 28; 38 and 48 days sprouting in the August- December period, 2007. The pasture was cut at 10 cm from the soil, applying as a basic fertilization 40 kg/ha P2O5 and the dosages of N2 were applied at 7 days after each cutting. The FV and MS, when applied N2 in the dosages of 100; 200 and 300 kg N2/ha increased significantly (P< 0.001) by 202,32 291,71 and 431,79% as compared to the control. The application of N2 increased the CC and PDN of the milk with the bestresults at 38 days sprouting in each treatment. The best B/C was in the treatments receiving the highest fertilizer dosage. The FV, MS and CC production was proportional to the N2 amount applied and the increase of the sprouting age. The PC content was proportional to the N2 dosage and inversely proportional to the increase of the sprouting age, with the approximation to critical values (7%) at the age of 48 days when the N2 was not applied.