杂交水稻的制种,是水稻杂优利用的重要环节。制种产量的高低及质量的好坏,直接影响到杂交水稻的推广速度和增产效果,一九七五年以来,各地对杂交制种技术,总结出了“夏繁秋制”的成功经验。去年,全省秋季制种四万五千九百余亩,一般平均亩产40～60斤,最高的达150 Hybrid rice seed production, hybrid rice is an important part of the use. The level of seed production and its quality will directly affect the popularization speed and yield of hybrid rice. Since 1970, the hybrid seed production techniques have been popularized throughout the world, and the successful experience of “Summer Fan Qiu” has been summed up. Last year, the province produced 45,900 mu of trees in autumn, with an average yield of 40-60 kg per mu and the highest level of 150