Principal component analysis of soil enzyme activities in the different treatments (CK unfertilized control; N1 300 kg fertilizer N ha-1; N2 600 kg fertilizer N ha-1; M composted manure; MN1 combined application of composted manure and 300 kg N fertilizer ha-1; MN2 combined application of manure and 600 kg fertilizer N ha-1).
PLOS ONE（2015）
关键词
soil enzyme activities,fertilizer,manure,
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