主要原因在于：直立、半直立穗型品种株高偏矮，基部节间短，更有利于抗倒；
The reasons were as follows: firstly, the varieties with erect and semierect panicle were dwarf with short basal internodes, which increased their lodging resistance;
采用不同氮素配比及人为改变源库比例，对生育后期水稻穗颈节与基部节间的伤流进行了研究。
By different nitrogen treatments and manual regulation of source-sink ratio, dynamic states of bleeding at neck-panicle node and basal internode of rice were studied.
结果表明，基部节间与穗颈节间的伤流强度差异显著，但它们在不同时期的变化趋势却大体相同。
Results indicate: the bleeding quantity of base department and the spike neck has prominent difference, but their variation tendency in different periods is about the same.
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