Análise qualitativa do biofertilizante de origem caprina.

Abstract

The technology of the biodigestion has proven to be one of the most efficient way for the treatment of the organic byproducts. The biomass, after subjected to the biodigestor, besides producing biogas, has a considerable important role that is to fertilize the soil essential for farming yield success. This papers aims at analyzing the quality of the biofertilizer coming from goat manure. Fifty animals, averaging two-years old, were risen in a semi-confinement system and grazing gramão grass (Cynodon dactylon). The excrements were collected daily and transferred to supply the biodigestor. Due to the management system, only 560g of the dejections produced by each animal was collected. The chemical analysis of the biofertilizante revealed the following nutrient concentrations and chemical properties: 23.3g/kg (2.33%) of N; 15.80 g/kg (1.58%) of K; humidity of 90%; CE of 3.1 dS/m; C/N ratio of 6; and pH = 8,1. In terms of its nutritional quality, evaluated by levels of NPK, the goat biofertilizer revealed to be superior to the one of bovine, but inferior, in NPK terms, to the one of swine. The C/N ratio of the biofertilizer from goat excrements is lower than those found in bubalino, swine and bovine, as reported in the literature, therefore this biofertilizer of the present study has restriction for use if matter concerns soil N immobilization.