Vermicompostagem a partir de dejeto bovino com resíduos de silagem de milho

Abstract

The growth of the agricultural sector and the consequent generation of waste agroforestry show to the need for technologies and alternatives that properly meet this problem. In order to evaluate the vermicomposting process of cattle manure with residue of corn silage, the following proportions were tested: 90:10; 70:30; 50:50; 30:70 e 10:90; in order to verify the behavior of the C/N ratio and the development of the worms of the species Eisenia andrei. The process was conducted in 20 vermicomposteiras over 45 days and monitored for the chemical and physico-chemical parameters (temperature, pH, electrical conductivity, density, moisture, total solids, fixed solids, volatile solids, total organic carbon, total kjeldahl nitrogen and C/N ratio). Temperature values, electrical conductivity and moisture remained within the recommended limits. At certain times the pH values were slightly above the recommended values. The grainsize indicated a reduction in particle size in all treatments. The volatile solids, total organic carbon, and C/N ratio values decreased, indicating stabilization of the compounds. The total kjeldahl nitrogen content increased in all treatments. There was multiplication of earthworms in all treatments. The mix of cattle manure and waste corn silage showed positive results for vermicomposting, as well as environmental viability, since these residues are not disposed of improperly.