Chlormequat chloride can inhibit gibberellin biosynthesis in plants, control plant growth, resist lodging, enhance photosynthesis and improve stress resistance. Paclobutrazol can also inhibit the biosynthesis of gibberellic acid, and has the functions of weakening the top growth advantage, promoting the growth of lateral buds, inhibiting stem elongation, shortening internodes, preventing vigorous growth, resisting lodging and enhancing the stress resistance of plants. It is often used for seed dressing, soaking or spraying to control the aboveground parts of wheat, corn, rice and other field crops and prevent lodging. By inhibiting the synthesis of gibberellic acid, sodium cyclamate calcium can inhibit the elongation of stems, make the stems stout and dark green, dwarf plants and prevent lodging. In case of rainstorm, too much fertilizer and water, too high density, etc. Wheat and corn will grow vigorously, the plants will grow too high and the stems will be soft. At this time, when encountering wind, it will fall down, leading to overlapping leaves, affecting photosynthesis, hindering the transportation of organic matter and water in the body, aggravating the occurrence of diseases and reducing the yield when the leaves are closed and the humidity is too high. This situation can be effectively avoided if chemicals such as chlormequat chloride and paclobutrazol are sprayed reasonably before the crops grow vigorously during the growing period. Spraying sodium cyclamate calcium at the end of rice tillering can also effectively prevent lodging. Methyl methylphenidate is mainly used for cotton plant type adjustment and lodging prevention. Tamoxifen is a plant growth regulator of cyclohexane carboxylic acid, which can inhibit gibberellin biosynthesis and cell elongation. Spraying tamoxifen on wheat leaves at seedling stage and tillering stage can properly control the growth of plant height and prevent lodging. Cotton has the characteristic of infinite growth. As long as the conditions such as fertilizer, water and temperature are suitable, cotton will keep growing, resulting in fewer bolls, and it is easy to lodging when encountering strong winds and continuous rainfall. In the process of cotton growth, spraying methylpiperazine can prevent overgrowth and lodging, adjust plant type, transport more nutrients to cotton bolls and improve yield.