Variation of dehydrogenaze activities of agriculture waste composting with microorganism agent in high temperature and static state

Variations of dehydrogenaze activities of excrement of animals composting with microorganism agent had been studied in high temperature and static state. Excrement of animals included cow excrement, chicken excrement and pig excrement, and wheat straw was used to adjust bulk for the compost. Results showed that compost temperature increased rapidly and entered into high temperature composting after 1-2 d, and high temperature lasted for 16-20 d for all treatments with microorganism agent. On the contrast, high temperature composting came at day 4-5 and last only 7-8 d for CK treatment. The composting temperature was higher in the treatment with microorganism agent than without (CK). Dehydrogenaze activities were higher in the treatment with microorganism agent than without during the whole composting process. Among three excrement of animals dehydrogenaze activities were in the order as: cow excrement H+ 29.32 μL/(g·d) chicken excrement H+ 25.66 μL/(g·d) ≈ pig excrement 25.34 H+ μL/(g·d) ，and the maximum dehydrogenaze activities appeared date was in the order as cow excrement (6 d) chicken excrement (12 d) pig excrement (14 d) . The biggest dehydrogenaze activities appeared at day 10 after composting, and the order for three animals excrements was cow excrement H+ 24.62 μL/(g· d) chicken excrement H+ 21.6 μL/(g·d) pig excrement H+ 18.62 μL/(g·d) for CK treatment. High-temperature (60C) was unfavorable for microbial activity at the early composting stage for the treatment with microorganism agent, and there was a negative linear correlation between dehydrogenaze activities and correlation temperature. After dehydrogenaze activities got its peak, dehydrogenaze activities had a significant positive linear with temperature. While composting temperature increased slowly for CK treatment, there was a significant linear correlation between temperature and dehydrogenaze activities during composting process.