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Root physiological indices of flue-cured tobacco under different soil types. (A) Root; (B) nitrate reductase (NR); (C) superoxide dismutase (SOD); (D) peroxidase (POD); Duncan’s multiple-range tests; p < 0.05; LS, limestone soil; PS, paddy soil; RS, red soil. Different lowercase letters showed significant difference (P < 0.05).
