Application of multifunctional fertilizer synergist, multifunctional synergistic fertilizer and application of multifunctional synergistic fertilizer

The invention belongs to the technical field of fertilizers, and particularly relates to application of a multifunctional fertilizer synergist, a multifunctional synergistic fertilizer and application of the multifunctional synergistic fertilizer. The fertilizer synergist is prepared from the following raw materials in parts by mass: 0.04 to 0.6 part of brassinolide, 0.001 to 0.01 part of diethyl aminoethyl hexanoate, 0.5 to 1.0 part of riboflavin, 0.1 to 0.5 part of thiamine, 1 to 5 parts of potassium chloride, 3 to 8 parts of borax and 5 to 10 parts of potassium humate. According to the multifunctional fertilizer synergist provided by the invention, the components are combined and compounded together to achieve a synergistic effect, so that the absorption of crops on soil nutrients can be increased, the utilization rate of a fertilizer is increased, and the improvement of the yield and the quality of the crops is promoted. The result of the embodiment shows that the fertilizer synergist provided by the inve