多效唑用于杂交稻制种花期调整,效果十分明显,而且经济省工。但如果使用不当,会造成植株矮小,包颈加重,穗部畸形,颖壳变小,穗总粒数减少,从而造成减产,严重的还会对下茬作物产生不利影响。因此,必须正确掌握使用方法、使用时间和使用量,适时利用“九二○”激素解除多效唑药性。 Paclobutrazol for hybrid rice seed flowering adjustment, the effect is obvious, but also economical and labor. However, if used improperly, it will result in short plants, heavier neck, malformation of ear, smaller glume shells and fewer total grains per spike, resulting in reduced production and serious adverse effects on the crops under the crop. Therefore, we must correctly grasp the use of methods, the use of time and the amount of timely use of “920” hormone solution of paclobutrazol.