Rice is one of the most important grain crops, but lodging has been a serious problem in rice growth stages, which not only results in yield cut but also reduces rice quality. Prohexadione calcium can shorten the length of the rice internodes and make rice stem become much thicker to improve its anti-lodging ability. In addition, prohexadione calcium can also be used to improve other crops' anti-lodging ability, such as wheat, corn, soybean, peanut, etc.