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Effect of CuO-NPs and CuSO4 on microbial activities in the five soils on days 7 and 90. (A) Substrate-induced respiration (SIR), (B) Nitrification enzyme activity (NEA), and (C) Denitrification enzyme activity (DEA). The symbols represent the significant effects of the treatments compared to the controls: #P < 0.06; *P < 0.05; **P < 0.01; ***P < 0.001. Note that the scale of the y-axes is different for each soil.
