Vermicompostagem de resíduos orgânicos para utilização agrícola.

Abstract

Wormcomposting is adopted in the treatment and stabilization of the rural and urban organic residues, creating a organic fertilizer utilized in the soil fertilization, providing improvement in the biologys, chemistrys and physics proprietys, by addition of the organic matter and nutrients utilization. However, a bad wormcompost, that is, that one derived of the residues improper collected, separte and processed, can contain toxic metals. Four organic composts produced from the composting of the urban green solid residues, using swineculture wastewater, commercial activator and pure water, and cattle manure, were submitted to the wormcomposting process during a 45 days period. The parameters: moisture, total nitrogen, phosphorus, potassium, organic carbon, copper, zinc, pH and carbon/nitrogen relation. The results showed that every treatments are in the limits of the organic fertilizer brazilian legislation. The metals zinc and copper were detected in the wormcomposts, however, the concentrations which don’t infer risk of the human health and contamination.