Efeito da ação decompositora da minhoca californiana (Lumbricus rubellus) na composição química de um fertilizante organomineral

We evaluated the action putrefactive Californian worms (Lumbricus rubellus) in the chemical composition of an organomineral fertilizer produced from the mixture in different proportions of organic waste is not degraded in the rumen of cattle (ROND), Chicken manure (CFG) dolomitic limestone (Cal D) and 4-14-8 granular mineral fertilizer (FM). The experimental design was randomized blocks with nine treatments consisting of ROND; ROND + Cal D; ROND + ROND + Cal D + FM (four concentrations) and Cal D + CFG (three concentrations) and, with three replicates, which were subjected to vermicomposting for a period of 80 days under controlled conditions of humidity and temperature. Among the chemical characteristics evaluated, it was observed that the best effect of the use of poultry litter has been a source of P2O5, and phosphorus availability was increased through the use of lime. However, liming showed a significant effect in reducing the nitrogen content in the compost. The loss of nitrogen was observed in all treatments, and to a lesser extent in the treatment where residues were used only under the action of earthworms rumen. Regarding the use of raw materials with C:N ratio low, we observed greater loss of nitrogen, and recommended addition to the mix carbon-rich materials. The use of vermicompost in combination with other materials used showed significant benefits in improving the chemical composition of the organomineral fertilizer.