在杂交水稻制种时,多年来主要采用幼穗剥查和余叶推算法预测花期,由于不同亲本的幼穗发育进度及最后三叶历期并不一致,因而预测精确度欠高,使制种农户难以掌握。我们在制种实践中,根据后三叶生长与幼穗发育进程的相关性,对不同亲木进行连续剥查,加以统计分析,结果证明它们之间 In the hybrid rice seed production, spikelets and leaves prediction are mainly used to predict the flowering season. Due to the inconsistent development of young spikes and the duration of the last three leaves of different parents, the prediction accuracy is low, Farmers can not grasp. In the practice of seed production, according to the correlation between the growth of post-three-leaf and the process of young panicle development, different parental woods were continuously stripped and statistically analyzed. The results showed that