双季稻区再生制种技术初探

Studies on the Technique of Ratooning Hybrid Rice Seed Production in Double-cropping Paddy Area

提出了双季稻区汕优６３、特优６３再生制种可行的花期安排及提高再生季异交结实率的有效措施．并讨论了再生季花期调控的有关问题．

The studies on the technique of ratooning hybrid rice seed production were conducted in Ningde Prefecture, a double-cropping paddy area, during 1991-1992 The results showed that for the seed production of Shanyou 63 and Teyou 63,the initial heading date should be arranged at July 20 of so for the main crop, September 1 or so for the ratooning crop ; to get good synchronization of nowering in the ratooning seed production,the pollen parent should be harvested 6 days earlier than the seed parent with the stubble heights 50 cm for the male parent and 20 cm for the female parent ; because of the initial-full heading duration of Minghui 63 （the male parent, 8-9 days） shorter than that of Zhenshan 97 A and Longtepu A （the female panents, 14 days） in the ratooning season, the method of multi-harvestings or harvesting at different stubble heights of the male parent could be used to prolong its nowering period. Another experiment of moving into male parent plants indicated that with the pollen load increased a lot, the outcrossing rate was increased much and the seed yield was much higher.