Abstract: Increasing global concerns about impacts of toxic chemicals, energy crisis and environmental protection, it is becoming more important to rely on local abundant agricultural bio resources than on chemical fertilizer. Understanding the effects of organic farming on soil quality parameters, such as microbial activity and soil nutrient content, is of central importance to concepts of sustainability. Investigation were done on the quantity, type and application of organic amendments on temporal dynamics of paddy soil organic carbon (SOC), soil total nitrogen (STN) and soil microbial biomass (SMB).