杂交水稻制种亩产超300kg技术

Technique for Yielding over 4.5t/ha on A Large Scale in Hybrid Rice Seed Production

针对杂交水稻制种有效穗不足、异交结实率低问题，实行“三改两增”成套制种新技术，从１９９０～１９９２年通过试验、示范、推广，１９９２年全县３３４０．７亩制种单产达到３０１ｋｇ，比前３年平均１６８．９ｋｇ增加１３１．１ｋｇ增产７８．２％．

Considering the problems of insufficient productive panicles and low out-crossing rote met in hybrid rice seed production, the Wanxian Seed Company adopted a new tedmique so called ＂three-changes-and -two-addings＂. The technique was experimented on , demonstrated and extended during 1991 - 1992. The results showed that the seed production plots under an eara of 668.14 ha yieldod at 4.515t/ha on average in 1992, 78.2% higher than the average yield of the last three years, 2.5335 t/ha. The main points of the technique are： （1） Changing the spacing of seed parents from 13.3cm × 13.3crn to （20＋ 10）cm × 13.3cm; （2） Changing the formulation of panicle fertilizer from with 30kg urea/ha only to with 150kg urea and 45 kg KH2PO4 applied at the late stage of meiotic division of pollen mother cell or the early stage of pollen filling（3）Chaging the method of GA3 spraying from spraying 3 times to 4 times during heading period and respraying 2-3 times at the grain Idling stage; （4） Adding organic fertilizer, i.e. applying stir-fried rape seeds 150kg/ha as basal; （5） Adding growth substance; i.e. spraying auxin 15 bottlelets/ha at 3 splits.