1 确定适宜的播种期和合理的播差期根据杂交水稻制种最佳扬花期和种子收获期对天气条件的要求,确定4月中、下旬播种,7月下旬抽穗扬花。由于父本抽穗整齐、花期短,而母本花期长,且柱头外露率高,所以在播差期安排上,以母本始穗比父本早2～3天为佳。1995～1997年,母本4月15日播种,一二期父本分别在4月21日、4月28日播种,父母本倒播差6天,母本始穗均比父本早2～3天,花期 1 to determine the appropriate sowing date and reasonable sowing date According to the hybrid hybrid rice seed flowering and seeding the best weather conditions, to determine the mid-April planting, late September heading and flowering. As the male parent earing neat, short flowering, and the mother of the flowering period, and the stigma exserted rate, so the sowing schedule, the mother ear ear earlier than the parent 2 to 3 days better. From 1995 to 1997, the female parent sowed on April 15, and the first and second male parents sowed on April 21 and April 28, respectively, 3 days, flowering