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Distribution of the microbial population of the casing layer treatment. Bac, aerobic bacteria; Act, actinomycetes; Fun, fungi; F. Pse, fluorescent Pseudomonas. Vertical bars indicate mean standard error. □: Bulk soil, ▒: S-S soil: Sterilized casing layer soil, ▧: N-S soil: Non-sterilized casing layer soil. Data are shown as the Mean ± SE. *P > 0.05, **P > 0.01.
