“九二○”是杂交水稻制种生产上一种不可缺少的生长激素。它可使不育系提早抽穗,减少包颈,增加结实率,提高产量。但随着生产技术的不断开发,“九二○”的用途逐步广泛,加上货源紧张,在生产中供不应求的矛盾日趋严重。为了缓和这一矛盾,笔者在多年实践和小区试验基础上提出“九二○”省工节本施用方法: “920 ” is an indispensable growth hormone in hybrid rice seed production. It can make the male sterile lines ear early, reduce the package neck, increase the seed setting rate and increase the yield. However, with the continuous development of production technology, the use of “ninety-two” has been gradually widened. In addition, with the shortage of supply sources, the contradiction between supply shortage and shortage in production has become increasingly serious. In order to ease this contradiction, the author put forward “Nine Two ○” provincial section on the basis of many years of practice and plot test methods of application: