杂交水稻制种依靠异交结实.因此,父母本花期理想相遇是制种稳产高产的首要前提。生产上常常可以看到:一个花期相遇不好的制种田(或制种片),其它一切技术措施都不能发挥应有的作用,甚至“劳而无功”.然而,实践上父母本播始期受许多因素的 Hybrid rice seed production depends on outcrossing, so the ideal meeting of the parents of flowering is the first prerequisite for stable and high yield. It can often be seen in production that a farming (or seed-making) system with poor flowering meets all other technical measures and can not even play its due role. However, in practice, By many factors