提高杂交水稻制种母本柱头外露率的栽培技术

提高制种产量的途径不单局限于如何获得充足的花粉量来提高异交结实率这一方面，还应通过栽培措施改善母本生育环境与营养条件来提高母本柱头外露率达到制种高产，本文从育秧、施肥、化学调往栽培角度介绍了提高柱头外露率的技术。

Cultural Technique of Raising Outcrossing Rate in Hybrid Rice Seed Production

In order to increase the outcrossing rate and the seed yield in hybrid rice seed production,the emphasis should be put on not only enough pollen load of male parent,but the improvement of cultural prac- tices. In this paper, three key practices of cultural management were introduced and discussed: a. raising healthy multi-tillered seedlings;b. applying enough organic fertilizer;c. chemically - controlling at three im- portant phases of panicle differentiation (differentiation of secondary branch and spikelet primordia,forma- tion of pollen mother cell and meiotic division of pollen mother cell). Through the technique in Jing county of Anfei province in 1991,about 20 hectares of hybrid rice seed production obtained a high yield of 2.96t/ha, which is the highest seed yield record in Jing county,and the outcrossing rate reached 57. 6%.