Uso de biofertilizante na adubação do capim piatã

Abstract

An experiment was conducted to evaluate the morphogenic and structural characteristics, dry matter production and the nutritional value of grass Piatã fertilized with different doses of biofertilizers pigs. We evaluated four doses of biofertilizers (0, 25, 50 and 75 kg ha -1 cutting -1 of N equivalent) and six repetitions. We evaluated leaf elongation rate, leaf appearance rate, Phyllochron, pseudostem elongation rate, final leaf length, number of green leaves, dry matter of the whole plant, leaf, pseudostem and dead material, contents crude protein, neutral detergent fiber, acid detergent fiber, lignin, cellulose and digestibility "in vitro" of the whole plant, leaf and pseudostem. All features, morphogenetic and structural, evaluated presented quadratic behavior in function of biofertilizers rates applied in the fertilizer. Phyllochron showed the best results at doses of 75 and 42 kg ha -1 cutting -1 of N equivalent for the first and second cut, respectively. The elongation rate of the pseudostem showed lower elongation at doses of 75 and 44 kg ha -1 cutting -1 of N equivalent to the first and second section respectively, thus improving the utilization of fodder the animal. The highest DM yields of the whole plant were found at doses of 35 and 75 kg ha -1 cutting -1 of N equivalent for the first and second section respectively. The best proportions sheet, pseudo stem and dead material were found at doses of 25 and 50 kg ha -1 cutting -1 of N equivalent. But the nutritional value was not significantly different in the evaluated doses, but differences were found between the cuts, the first cut better than the second.