Nitrogen transformations during pig manure composting
Composting is now suggested as one of the environmentallyand friendly alternative method for disposal of solid organic wastes, as it leads to minimization, stabilization, and utilization of organic waste. Transformations of nitrogen were investigated inco-composting of pig manure with different amendments, such as sawdust and leaves. Samples were analyzed for pH, total-N, soluble NH4-N, soluble NO3-N and soluble organic-N. The total-N increased after 63 days of composting, as well as the soluble NO3-N and soluble organic-N. Soluble NH4-N increased significantly and showed peak values at day 7, thereafter decreased sharply and gradually to lower levels. Seed germination index (GI) showed that co-composting of pig manure with sawdust reached maturity after 49 days of composting, while co-composting of pig manure with sawdust and leaves required shorter time for 35 days. Soluble NH4-N was significantly negatively (P<0.05), while soluble NO3-N and soluble organic-N were significantly positively (P<0.05), correlated with seed germination index (GI). Addition of leaves in co-composting of pig manure with sawdust had no significant impacts on nitrogen transformations, but it was beneficial for maturity of pig manure compost.
作 者： HUANG Guo-feng Wu Qi-tang LI Fang-bai WONG J.W.C 作者单位： HUANG Guo-feng,Wu Qi-tang,LI Fang-bai(College of Natural Resources and Environment, South China Agricultural University, Wushan,)WONG J.W.C(Department of Biology, Hong Kong Baptist University,)
刊 名： 环境科学学报(英文版) ISTIC SCI 英文刊名： JOURNAL OF ENVIRONMENTAL SCIENCES 年，卷(期)： 2001 13(4) 分类号： X701 关键词：