Abstract
An incubation experiment was carried out in a laboratory at room temperature (28 ± 4°C) for 60 days with four organic materials to assess the biodynamics of microbial biomass nitrogen and sulfur. The organic materials were dustbin waste, poultry litter, sewage sludge and rice straw. The organic materials were added at a ratio of 2 % to the soil. A basal dressing of 200 μg P and 250 μg K/g soil in the form of KH2PO4 was applied to each treatment, except for the control. The highest rate of CO2-C evolution was observed in the rice straw amended soil, which was significantly higher than that of poultry litter, dustbin waste, sewage sludge treated soil and control. Rice straw contributed the highest amounts of biomass-C, -N and -S which were significantly higher than that of poultry litter, dustbin waste and sewage sludge amended soils. The soils amended with sewage sludge, dustbin waste and poultry litter showed N and S mineralization whereas soil amended with rice straw induced N and S immobilization.
