Changes of microorganisms and E_4/E_6 in agricultural waste materials during composting in static state with high temperature

An experiment was conducted with mixed materials of chicken excrement and wheat straw to study the changes of microorganism population, E4/E6 election conductance rate (EC), and pH during an aeration composting process in a static state with high temperature. Results showed that,with addition of microorganism agent,a highest population number was found to be 2. 51×1012g-1 for bacteria and 3. 68× 108 g-1 for actinomyces in two days. The fungus numbered 7. 58× 108 g-1,relatively higher at the beginning of composting while decreased with temperature rise,and at late stage of composting with temperature decline, the population of fungi rose slowly. The number of fungi was low whereas that of bacteria and actinomyces was much higher. Without adding microorganism agent,the highest population was found to be 5. 01 × 10 10 g-1 for bacteria in four days and 1. 44× 108 g-1 for actinomyces in three days,and number of fungi number was 5. 01 × 107 g-1 in two days. Applying microorganism agent could reduce pH,and increase EC at the same time. The E4/E6 was 1. 57 - 1. 68 with adding agent microorganism,and the E4/E6of CK was 2. 16 -2. 41 after 30 days,indicating that addition of microorganism agent could promote the process of humifi-cation.