Effects of Turning Frequency and Mixing Ratio on Trough AerobicComposting of Chicken Manure

In order to improve quality of trough composting products and study factors that affect quality of trough composting, a certain proportion of chicken manure（CM）and auxiliary materials（AM） were mixed as research object, and changes of four composting quality indexes, such as total nutrients, water content, temperature and pH, were measured under treatment of three different turning frequencies（every 12, 24 and 36 h to carry out a turning operation）of materials with three mixing ratiosCM∶AM（W/W）, 50∶50, 60∶40 and 70∶30．Variation rule of composting material quality index during two weeks of aerobic composting were analyzed and compared．Results showed that turning frequency and mixing ratio had different degrees of influence on quality index of composting．Mixing ratio had an extremely significant effect on changes of total nutrients and water content of compost materials（P < 0.01）, turning frequency had an extremely significant effect on changes of water content of compost materials（P < 0.01）, and had a significant effect on changes of pH（0.01≤P≤0.05）, both of which had no significant effect on changes of temperature．In addition, test results showed that under conditions of mixing ratio of 70∶30 and turning frequency of every 24 h, total nutrient content increased most obviously after composting, and physicochemical properties were stable, which was conducive to production of high-quality organic fertilizer．