Preparation method and application of compound type 4 rape seed production chemical emasculation agent

The invention discloses a preparation method of a compound type 4 rape seed production chemical emasculation agent, and relates to the field of agriculture, and the preparation method comprises the following steps: S1, raw material formula: 1 g of tribenuron-methyl 95% active compound, 8 g of paclobutrazol 10% wettable powder, 10 g of carbendazim 50% wettable powder, and 4 g of 40% phosethyl-Al; s2, a preparation method comprises the following steps: taking 10000 ml of purified water and 1 g of tribenuron-methyl; 8 g of paclobutrazol 10% wettable powder; 10 g of carbendazim 50% wettable powder and 4 g of 40% fosetyl-aluminum; mixing the raw materials together, and fully and uniformly mixing by using a high-speed stirrer to prepare a raw medicine for later use. According to the method, the problems that in the rape seed production process, in the cytoplasm three-line male sterile line rape seed production process, when a female parent is affected by low temperature, excessive pollen appears, selfing fruiting i