Chemical and Biological Evaluation of Maturity of Pig Manure Compost at Different C/N Ratios

查看全文 作　　者：HUANG GUOFENG;WU QITANG;LI FANGBAI;and J. W. C. WONG College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642 (China) Department of Biology, Hong Kong Baptist University, Hong Kong (China) 出　　处：《Pedosphere》索引2001年第11卷第3期,共8页 基　　金：the Rockefeller Brother Fund Ltd. and Guangdong Key Laboratory of Agricultural Environment integrated Control. 摘　　要：Aerobic static pile composting (mechanical turning every 3 days) of pig manure was prepared at & m3 windrow heaps. Sawdust was used as the bulking agent to provide additional carbon and to increase the porosity of the substrate. Two treatments at initial C/N ratios of 30 and 15, respectively, were designed in the study. Dissolved organic carbon (DOC), soluble NH+4-N, C/N ratios in solid and aqueous phases, E4/E6 ratios, and seed germination index (GI) were determined to evaluate the maturity of the co-composts. Seed germination index, a biological parameter, was suggested as one of the most reliable maturity indicators for organic compost. The results showed that the treatment at the initial C/N ratio of 30 reached maturity after 49 days of composting; however, the treatment at the initial C/N ratio of 15 should require composting time of longer than 63 days to obtain maturation. Chemical multi-indicator evaluation was necessary, and the GI measurement was the recommended approach for maturity evaluation in the study. 关 键 词：碳/氮比值 猪粪 化学成分 生物学 壮年期 有机肥料