Crescimento e produção do capim Andropogon gayanus sob doses de biofertilizante

Abstract

The Andropogon grass (Andropogon gayanus), has as characteristics good adaptation to dry regions, tolerance to acid soils and low fertility, therefore it has been recommended as an alternative for pasture formation and used in different regions of Brazil. However, its development can be enhanced through adequate fertilization. Due to the costs of chemical fertilizers, there is a need for alternative fertilizers and, in this sense, biofertilizers stand out, as they are a quick source of nutrients for low cost and easily available plants, particularly for small rural producers and agriculture familiar. The experiment was developed at the Experimental Farm of the IFPI - Campus Uruçuí and conducted in pots with a capacity of 9.0 L containing substrate consisting of soil from a native forest area. The biofertilizer was produced from the fermentation of bovine manure in a handmade biodigester for a period of 40 days. The experimental design was completely randomized, consisting of four treatments with addition of 0% biofertilizer; 2.5%; 5.0% and 7.5%, plus a treatment using chemical fertilizer composed of 50 mg / kg of N soil, 100 mg / kg of P and 100 mg / kg of K, with six repetitions. The following variables were evaluated: plant height, stem height, leaf blade length, leaf blade width and dry matter production at 90 days after sowing. It was found that the application of biofertilizer, showed significant increases for all variables. In view of the results, it is admitted that the use of fertilization with bovine biofertilizer from the concentration of 5% of the volume of substrate is able to promote the growth and production of Andropogon grass similar to the use of chemical fertilization.