1. Chemical addition method. When cucumbers grow 1-3 true leaves, the flower buds of leaves 2-21 are gradually differentiated, but it is not yet decided whether female flowers or male flowers. Ethephon spraying is the best time. The concentration of ethephon spray is generally 100-200 mg/l. If sprayed twice, the effect is good at 200 mg/L; spraying 3 times, the effect is 100 mg/L, spraying 1-2 times. When sprayed, the sprayer was used to spray the front and back of the blade at 4 o'clock on the sunny day.

2. Sunshade control lighting. Cucumbers are short-day crops, artificially shortening the light can increase the number of female flowers. Before the formation of cucumber flowers, the use of black shade nets with low black shading rates such as black SZW-10 in summer can reduce the average daily temperature of the cultivated beds by 1.4°C, and the average temperature of 5 cm can be reduced by 2.1°C. The average light intensity can be reduced. 66.2%, the daily sunshine hours control within 9 hours.

3. Increase moisture and nitrogen fertilizers. Cucumber plants grown in 80% humidity are more than twice as productive as soils with 40% humidity. It should be ensured that the cucumbers have sufficient moisture conditions, timely irrigation, and maintain a moist environment. In the early growth and development of cucumber, if sufficient nitrogen fertilizer is ensured, the differentiation of female flowers can also be increased.

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