株行距过小或插植苗数过多时，水稻基部第2节间的倒伏指数增大，抗倒伏能力下降。
When plant spacing and row spacing were too small or seedling Numbers per hole was too much, 2nd internode lodging index for two rice varieties increased and resistance ability decreased.
但从总体水平分析，北方稻区直立、半直立穗型粳稻品种比弯曲穗型品种倒伏指数小，抗倒性好。
In general, rice varieties with erect and semierect panicle from northern China had smaller lodging index and stronger lodging resistance than those with curved panicle.
倒伏指数与株高、地上部生物量、茎粗的相关系数均达1%显著水平，表明水稻倒伏指数受株高、地上部生物量和茎粗等性状的显著影响。
The main results were as follows: 1. Plant height, culm thickness and biomass per plant were correlated to the lodging index at the 1% level of significance.
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