杂交水稻比常规水稻增产,但需要年年制种才能保证大面积推广.杂交稻制种产量的高低主要取决于父、母本花期相遇的程度.实践证明,利用叶龄差确定父、母本的育秧插秧时间以及赶露水是调节花期相遇的有效措施.现介绍如下: 杂交稻秀优57的父本C_(57)叶片多、生育期长,母本秀岭A叶片少、生育期短.根据叶龄对应关系,利用回归方程计算出它们的育秧叶龄差为4.06, Hybrid rice yield more than conventional rice, but annual seed production can ensure the large-scale promotion.The yield of hybrid rice seed depends mainly on the degree of parent and female flower encounter.Practice has proved that the determination of the father and mother Of seedling transplanting time and catch dew water is an effective measure to regulate the flowering period.At present, the introduction is as follows: The hybrid rice Xianyou 57 had more C_ (57) leaves and longer growth period. According to the leaf age correspondence, the regression equation was used to calculate the leaf age difference of their seedlings was 4.06,