ASSOCIATION EFFECTS OF SOME ALTERNATIVE SUBSTRATES ON THE NPK AFTER COMPOSTING AND VERMICOMPOSTING PROCESSES

Abstract

Composting and vermicomposting processes were evaluated by studying the effects due to the association of some alternative substrates, at different portions (20, 40, 60, 80 and 100%) to the organic fraction of urban solid residues, which is known as “seedling”. he results obtained through the experiments allow to conclude that several factors interfere on the quality of the generated product. In the composting process such factors are related to the substrate, the humidity control, the temperature, and on the way that the cells are revolved along the experiment. Of the analyzed substrate, the bovine manure (E) and pruning/weeding residue (R) they are preferential for the vermicompostagem process, for they associate characteristics as microflora, macroflora, size of particles and capacity of retention of water. In a general way, any substrate can be employees in the composting process and of vermicomposting. However, it is necessary to observe certain characteristic of those residues to presuppose the concentration of the elements NPK. The low concentration of the nutrients of the final product is related to the origin material. The composting processes and of vermicomposting they are technical that make available the nutrients, not having, therefore, won substantial in content of those nutritious ones that qualifies the composition generated as an effective substitute of fertilizing rights.

Key Words: composting, organics substrates, vermicomposting.