单株玉米的根干重随水分条件的改善而提高，高N处理的玉米根重低于相应的低N处理；

The dry root weight under high N level was lower than that under low N level;

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单株玉米的根干重随水分条件的改善而提高，高N处理的玉米根重低于相应的低N处理；

The dry root weight under high N level was lower than that under low N level;

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