This invention discloses a compound
plant growth regulator, its preparation method, and its application, belonging to the technical field of
plant growth regulators. The compound
plant growth regulator of this invention is prepared from the following raw materials: *
Broussonetia papyrifera* leaf extract, saikosaponin A,
calcium cyclohexane,
tebuconazole, aminoethyl ester, 24-epibrassinolide,
fulvic acid, surfactant, and deionized water. This
plant growth regulator significantly improves the lodging resistance of soybeans, optimizes yield composition, and increases yield through the synergistic effect of specific components. The innovatively added *
Broussonetia papyrifera* leaf extract and saikosaponin A can both reduce plant height, increase stem
diameter, and simultaneously improve seed setting rate and 100-seed weight. Furthermore, the formulation of this invention uses
environmentally friendly surfactants and homogenization processes, resulting in good dispersibility and storage stability, meeting the needs of green and efficient
agriculture and possessing significant agronomic promotion value.