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(a–c) Carbon content (C), nitrogen content (N) and carbon/nitrogen ratio (C/N); (d–f) β-glucosidase, N-acetylglucosaminidase and acid phosphatase enzyme activities; (g) mean activity of β-glucosidase, N-acetylglucosaminidase and acid phosphatase; (h) pH; and (i) electrical conductivities in the five rhizosphere soil samples (Rs1–Rs5).
