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准确判断杂交水稻制种亲本倒 ４，５ 叶时期有利于及时预测和调节花期，介绍了识别亲本倒 ４，５ 叶的几种方法以及根据亲本余叶数预测花期的技术。
Accurately judging the inverted 4, 5-leaf stages of hybrid rice seed production is conducive to the timely prediction and regulation of flowering. Several methods to identify the inverted 4,5-leaf of parents and the technique of predicting the flowering period based on the number of remaining leaves of the parents were introduced.