杂交稻制种的花期相遇是许多农业科研人员、种子工作者和广大农户孜孜追寻的目标,而播差期的合理确定则是花期相遇的基础与前提。笔者通过5a的制种实践,总结如下几点体会。1 小面积试制是确保制种成功的前提在制种基地隔离区外可搞小面积的新组合试制,面积不必大,333～1334m~2均可,通过与制种基地相近地域、相似的水肥管理,可得出某一年度新组合父母本的播始期、叶片数、开花习性,通过其与制种区内制种技术较成熟组合父母本播始期、叶片数、开花 The flowering date of hybrid rice seed is the target pursued by many agricultural researchers, seed workers and the majority of farmers, and the reasonable determination of sowing date is the basis and premise for the meeting of flowering date. The author of the system through the practice of 5a, summed up the following experience. A small area trial is to ensure the success of seed production in the base area outside the isolation area can engage in a small area of ​​the new combination of trial preparation, the area does not have to be large, 333 ~ 1334m ~ 2 can be, through similar areas and seed production base, similar water and fertilizer Management, we can draw a new combination of the parent year of the new period, the number of leaves, flowering habits, through its seed production area with more mature combination of parents of this sowing date, the number of leaves, flowering