Decomposition Rate of Municipal Wastes Compost, Vermi Compost, Manure and Pistaco Compost in Different Soil Texture and Salinity in Laboratory Condition

Incorporation of plant residues in soils is an important agricultural practice for maintaining soil fertility under organic management systems. Plant residues quality, soil physical and chemical properties, and the microbial population diversity of soils are the most important factors influencing the decomposition of added organic matter to soils. Decomposition rate of municipal wastes compost, vermi compost, manure and pistaco compost was studied in two soil samples with contrasting texture, two herbicides and three salt concentrations under laboratory condition. Soil moisture was adjusted at 50% water holding capacity and soil samples were incubated at 28 oC. The CO2 production was used as an index for decomposition rate of organic matter. Result showed that decomposition rate of pistaco compost is higher than those municipal wastes compost of vermi compost and manure. The CO2 evolution concentration and the rate of organic matter decomposition followed, and equations, respectively. A positive correlation was found between the rate of organic matter decomposition and K value. The results also showed that high decomposition rate based on K value, belong to pistaco compost, manure, municipal wastes compost and vermi compost, respectively.