The reason for this was that as the organic matters of the
matrix were getting degraded, the heavy metal Cu got enriched
(Cai et al., 2007; Ko et al., 2008), then the enriched Cu presented
inhibiting effect on polyphenol oxidase. At the final stage of composting, the polyphenol oxidase activities tended to be the same
in A(control), B(150), C(300) and D(600), and the major reason
for this was that the heavy metal Cu was chelated and its bioavailability got lowered, while humus and other Organic Macromolecular Compounds were formed
The reason for this was that as the organic matters of thematrix were getting degraded, the heavy metal Cu got enriched(Cai et al., 2007; Ko et al., 2008), then the enriched Cu presentedinhibiting effect on polyphenol oxidase. At the final stage of composting, the polyphenol oxidase activities tended to be the samein A(control), B(150), C(300) and D(600), and the major reasonfor this was that the heavy metal Cu was chelated and its bioavailability got lowered, while humus and other Organic Macromolecular Compounds were formed
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