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《Journal of Agro-environmental Science》 2005-01
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N Loss and Its Characteristics During High Temperature Composting

HE Qi, LI Guo xue, ZHANG Ya ning, LIN Xiao feng (College of Resource and Environment Science, China Agriculture University, Beijing 100094, China)  
Co-composting tests with C/N 12.4, 17.4, 31.2 and 35.2 using poultry manure and wheat straw as raw composting materials were conducted under natural ventilation. Various kinds of nitrogen transform and loss way were determined at different composting stages. The results indicated that TOC reduced gradually with the composting time. The lower the ratio of C/N, the less the degradation of TOC, and the total nitrogen in compost tended to decrease at low C/N, thosewere the contrary at high C/N. During composting, the ratio of C/N tended to decrease, the treatments of 31.2C/N and 35.2C/N decreased remarkably, but changed a little at the treatments of 12.4C/N and 17.4C/N. For the four compost treatments of 2.4 C/N, 17.4 C/N, 31.2 C/N, IMG SRC="IMAGE/03230144.JPG" HEIGHT=11 WIDTH=18IMG SRC="IMAGE/03230145.JPG" HEIGHT=9 WIDTH=1835.2C/N, the rate of nitrogen losing was 58.7%, 60.2%, 37.7%, 23.3%respectively. Main way of nitrogen losing was volatilization in the form of ammonia originated from ammonium. The main period of nitrogen losing was 3~7 d. The -N and Org-N during composting changed remarkably; while, -N changed a little and only happened on laterstage of composting, at 28 day of composting, the change percentage of NO3-N content accounted for only 0.25%~0.58%of total N change. Lower C/N resulted in more loss of Org-N and less loss of NH3-N in the compost, while higher C/N in composting not only led to less loss of NH3-N but also made NH3-N turn into Org-N.
【Fund】: 国家863项目“环境友好型肥料研制与产业化”(2001AA246023);; 国家十五攻关项目“高效有机肥与缓释肥产业化技术研究与开发”(2002BA516A03);; 863计划“新型多功能生物有机肥的研究与开发”(2002AA245031)
【CateGory Index】: S141.4
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