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Changes in the catalase and urease activity in soil. The CK, A0, A1, A2, A3, and A4 groups were all non-sterile treatment groups, of which CK was a blank soil group; A0 was a blank pig manure + blank soil group; and A1, A2, A3, and A4 were pig manure + blank soil groups with initial DOX concentrations of 4.4, 8.0, 10.9, and 13.2 mg/kg, respectively.
