花期相遇,是杂交水稻制种高产的前提条件。保证花期相遇,基本的问题是弄清水稻播种到始穗阶段的生育规律。通常的认识是播始期主要受气温影响,有效积温的多少决定了生育进程。近年来,实践上已经意识到栽培因素的影响,但由于缺乏规律性的认识,因此未能 Flowering meet, is a prerequisite for high yield of hybrid rice seed. To ensure that the flowering period meets, the basic problem is to find out the law of reproduction in the period from rice sowing to earring. The common understanding is that the start-up period is mainly affected by the temperature, and the effective accumulated temperature determines the process of reproduction. In recent years, in practice, it has been aware of the influence of cultivation factors. However, due to the lack of regular understanding, it failed to