Caracterização química de húmus produzido por minhoca vermelha da Califórnia (Eisenia foetida).

Abstract

This work had as objective the chemical characterization of organic substrate; manure of tanned corral (MTC), composed of wood residue (CWR) and triturated fitomassa of copier (TFC). Experiment was installed at home of vegetation belonging to the entomology laboratory in the experimental field of Embrapa Amazônia Oriental, located in the municipal district of Belem. Used experimental delieament was it entirely casualized with 3 repetitions, testing 3 substrate as obtained treatments of form factorial. The treatments were appraised in three times: 45, 60 and 75 days. Were made analyses before for knowledge of the chemical composition of the substrate decomposition (time O day). Its was made installation in 27 wood boxes measuring each one 0.6 m of length for 0.5 m of width and 0.3 m of height. The substrate were heavy and later distributed in the 27 boxes, where nine of them received MTC, others nine CWR, and the nine remaining TFC. In each one of those boxes 300 red earthwork of California was inoculated. The collections of the samples were accomplished to the 45, 60 and 75 days. Humectant material was separate from the remaining of the substrate being used it sifts of metallice mesh with 0.5 cm of diameter. The texts of N, P, K, Ca and Mg were certain according to the methods described in the manual of analysis of vegetable fabric (Embrapa, 1997), organic matter and organic carbon were analyzed by the method of Walkley & Black. The analyses done in the substrate before the decomposition revealed the largest concentrations of N, P, K and Mg in MTC, while the largest texts of calcium were found in CWR. The relationship C/N 27,71 found in MTC is inside of the limits of C/N more recommended for a fast and efficient compostage. The variance analysis done after the decomposition of the substrate by the earthwork showed that P, Ca, Mg, organic matter, organic carbon and relationship C/N didn't present significant interaction between the substrate and the times of conduction of the experiment. ln MTC he met the largest concentrations of N, P, K and Mg, while in CWR the largest concentrations of calcium were observed. MTC also presented the largest texts of organic matter, organic carbon, humectant material as well as the smallest relationship C/N. The substrate MTC and CWR presented a larger efficiency in the production of humectant material, even so the humectant material produced with MTC it presented concentrations of nutrients with higher than obtained values then in CWR. TFC presented resistance the decomposition for the earthwork producing humectant material with low concentrations of nutritious.