Conversion of physical and chemical characteristics of a mixture of dairy manure and rice straw during composting process

With the mixture of diary manure and rice straw as the raw material, the conversion of physical and chemical characteristics of it during the composting process under high temperature and aerobic condition was studied. The results showed that, the composting pile had experienced warming, high temperature and cooling periods. During high temperature stage, the temperature of the composting pile reached 57 ℃, and had been maintained for 9 days; the organic matter content of the compost materials was significantly reduced after the cooling period in which the pile was fully matured. At the end of the composting process, the content of TN, NO3--N, TP and available phosphorus in the compost product increased by 22.45% 、 41.46% 、 68.98% and 13.60% respectively; therefore, the availability of nutritional elements of the compost materials for plants growing was improved. It could draw a conclusion that, through the composting process under high temperature aerobic condition, the sterilization, stabilization and resource utilization of dairy manure could be achieved.