采用在生长后期用清水更换营养液的方法，可明显降低小白菜硝酸盐的含量。
By replacing nutrition solution with clear water during the later stage of growth, the nitrate content of pakchoi was significantly reduced.
在生长后期，经过生物有机肥处理的株高、茎径和叶面积指数均比对照区高。
At the late period, plant height, stem diameter and leaf area index of the bio-organic fertilizer treatments were higher than that of the control.
假根毛的各生长阶段形态不同，在生长后期的部分假根毛顶端产生叉状分枝。
The form of rhizoid hairs may vary at different growth stages and part of rhizoid forms forked branch on its tip in the later growth stage.
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