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丹玉一号玉米幼苗的叶鞘本应是紫红色,但实际生产田里却有10~20%为绿色的叶鞘。这跟产量有没有关系?间苗时选留哪样苗好呢?
Dan Yu corn seedling leaf sheath should be purple, but the actual production field there are 10 to 20% of the green leaf sheath. Does this have anything to do with production?