合理喷施激素(九二○、花调灵)是解除母本包颈、提高柱头外露率和异交结实率的有效方法,喷施激素应从以下几个方面考虑:1 根据母本的有效穗数,确定激素的用量激素的用量多少,应根据田间实际情况综合考虑,亩有效穗数多时,应适当增加,反之,如有效穗数少,花期相遇良好,施肥水平高,苗嫩时应适当减少用量。实践证明,九二 Proper spraying of hormones (920, Hualing Ling) is to remove the female parent package neck, raising stigma exsertion rate and outcrossing rate of effective methods, spraying hormones should be considered from the following aspects: 1 according to the female parent panicle The number of hormones to determine how much the amount of hormones should be taken into account according to the actual situation in the field, acres of effective spikes for a long time, should be an appropriate increase, on the contrary, such as less effective spikes, flowering well, fertilization level, Reduce the amount. Practice shows that nine two