大面积杂交稻制种单产如何稳定在250kg以上，高的达300～350kg，这是所有从事杂交稻制种的科技人员所希望的。制种是通过异交结实而获得产量，因此高产制种应围绕如何提高异交结实这一中心，笔者从1987年开始搞制种至今，经过不断的实践，对单产275～300kg（单产面积666．... How to stabilize the yield of large-area hybrid rice is more than 250kg, and the high is 300 ~ 350kg, which is what all the technicians engaged in hybrid rice seed production hope. Seed production is obtained through outcrossing and fruiting, so high-yielding seed should focus on how to improve the center of out-crossing and fruiting. Since 1987, the author started producing seeds so far. After continuous practice, the yield of 275 ~ 300kg (yield area 666 ....