Composting of Pig Manure with Highly Efficient Microbial Agent

[Objective] The aim of this study was to develop a low-cost and localized microbial agent so as to solve high cost of microbial agent for pig manure composting in Jiaxing City.[Method] Pig manure in the experimental group and control group was inoculated with the self-developed microbial agent and commercial microbial agent,respectively.The manure was composted for 38 d.The indicators of compost including physical behavior,temperature,pH value,water content,organic matter,dissolved nitrogen,carbon nitrogen ratio and germination rate were compared.[Result] The water content of the experimental pig manure compost declined to 26.10% after 33 d of composting,which met the standard of maturity,while the water content of the control was still slightly higher than 30% after 38 d.The germination rate of seeds fertilized with the experimental pig manure compost reached the standard of maturity on Day 28,while that of the control reached the standard of maturity on Day 35.When the composting was finished,the carbon nitrogen ratio of the experimental and control pig manure was 14.64 and 16.43,respectively,and their organic matter content was about 45%.All these indexes could meet the standards of organic fertilizer products.[Conclusion] The self-developed microbial agent can meet the requirements of pig manure composting,and it can reduce composting time by 5-8 d compared to the commercial agent.In addition,the fertilizer product composted by the self-developed microbial agent has lower water content and is suitable for preservation.