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Changes in the physicochemical properties and enzyme activities of tea tree soil under different treatments. (A) Total nitrogen. (B) Total potassium. (C) Total phosphorus. (D) Soil organic matter. (E) pH. (F) Peroxidase. (G) Cellulase. (H) Polyphenol oxidase. (I) Acidic protease. Different numbers of asterisks indicate levels of statistical significance: * for p < 0.05, ** for p < 0.01, *** for p < 0.001.
