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Little information is available on the roles of earthworms in N transformation and biological activities in heavy metal-contaminated soils. The purpose of the present paper is to examine the effects of earthworm on nitrifying and denitrifying enzyme activities of Zn-treated soils. ZnCl2 solution was added to soils at rates ranging from 0 to 400mg Zn kg1 and was allowed to fractionate and stabilize...
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