The reasons were as follows: firstly, the varieties with erect and semierect panicle were dwarf with short basal internodes, which increased their lodging resistance;
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；
2
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.