[Effect of pig manure and rice straw on biological activity of Cd-contaminated soil]

Studies on the effects of pig manure and rice straw on the biological activity of Cd-contaminated permeable paddy soil showed that Cd-contaminated soil had a declined biological activity. After applying organic manure, the content of soil available Cd decreased significantly, being about 40%, and soil microbial C, N and P and soil dehydrogenase and catalase activities increased 30%-100%. There existed a negative correlation between soil available Cd and soil microbial C and N, indicating that microbial C and N could be used as an index of Cd-contaminated soil.