Because cucumbers only open male flowers, do not open female flowers, and it is difficult to result, people call it cucumber "infertility." The main reason why cucumbers only open male flowers is the disorder of cell division in cucumber plants. When the vegetative growth of the cucumber plant is thick, the ability to deliver and grow can be enhanced, and the male and female flowers can be evenly opened on the same plant. However, if the cucumber plants grow mad during the growth process, they will destroy the branching ability of cucumber plants, resulting in cucumber plants only open male flowers without opening female flowers or only open a very limited number of female flowers at the shoot tip. This will seriously affect the yield and benefits of cucumber. In order to prevent cucumber from getting "infertility", measures can be taken to strictly control the melon madness and ensure that cucumber plants grow thick and robust, and enhance the ability of cucumber plants to "open outside the branch" and the male and female flowers open together. The specific method is: When the cucumber plants grow more than 4 true leaves, melon vines grow about 300 mm, the plant growth regulator can be used per acre ethephon 200 ~ 500PPm or naphthalene acetic acid 5 ~ 10g or prolactin 10g, and then For 50-70 kilograms of water, evenly sprayed 1 or 2 times in the cucumber field, it can promote the normal cell division of cucumber plants, enhance the ability of both male and female flowers to open, effectively solve the "sterility" of cucumber. The above method is also applicable to greenhouses and protected areas.