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Redundancy analysis (RDA) demonstrating the relationships between soil environmental factors and soil microbial communities during spring (S) and fall (F) cropping seasons in the control (CM), alfalfa (A), trifolium (T), wheat (W), chrysanthemum (C), rye (Ry), mustard (M), and rape (Ra). *P < 0.05, **P < 0.01, ***P < 0.001.
