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确定杂交水稻制种父、母本播差期的３种方法中，叶差法虽准但不易掌握；时差法简便却误差大；温差法既准确又使用方便，但我国对这方面的研究报道极少。现阶段杂交水稻制种，基本上用时差法确定父、母本播差期，由于气候变化因素的影响，同一时段内的积温年度间有一定的差异。
Among the three methods for determining sowing date of hybrid rice seed production, although the leaf difference method is accurate but not easy to grasp, the time difference method is simple and error-prone. The temperature difference method is accurate and easy to use. However, Very few. At this stage hybrid rice seed production, basically use the time difference method to determine the parent and the mother of the broadcast period, due to the impact of climate change factors, within the same period of accumulated temperature have some differences.