The population root activity of interplanting cotton decreased significantly at the square and boll stage, with the high value period delayed 15 to 25 days.
套作棉花在蕾铃期群体根系活力降低，且根系活力高值期出现的时间后延15 ~ 25天，高值持续期明显缩短。
The nitrogen accumulation in cotton boll-shell, cottonseed, cotton fiber and single boll were significantly affected by the nitrogen application rates and their blooming stage.
铃壳、棉籽、纤维及单铃氮素累积受施氮水平和开花期的影响。
The aphid size at the cotton seedling, budding and boll setting stages was not significantly different in Nanjing, 1999. But in the boll opening stage the aphid size became smaller.
1999年江苏南京在棉花苗、蕾和铃期，棉蚜体型大小无显著差异，但到吐絮期后则显著变小。
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