杂交稻亲本花期是否相遇良好,是制种产量高低的关键之一。在生产上虽有一系列调整花期的措施,如肥、水的促控,拔苞、切根,割叶、喷九二○等,也确有一定的效果,但是,这总是因为花期相遇不好,不得已而采用的办法。花期不遇的原因很多,但制种组合的亲 Hybrid rice parental flowering is good, is one of the keys to seed production level. Although there are a series of measures to adjust the flowering period in production, such as fertilizer and water, promoting and controlling the bud, pulling the bud, cutting the root, cutting the leaves and spraying the buds, etc., there are indeed some effects. However, this is always because the flowering period is not met Good, the last resort. Flowering not many reasons, but seed combination of pro