1. Chemical increment method. When the cucumber grows 1-3 true leaves, the flower buds in the leaf axils of sections 2-21 are successively differentiated, but it is not yet decided whether it is a female flower or a male flower. At this time, spraying ethephon is the best time. The concentration of spraying ethephon is generally 100-200 mg/L. If sprayed twice, the effect is 200 mg/liter; if sprayed three times, the effect is 100 mg/liter, spray 1-2 times. When spraying, use a sprayer to spray the front and back of the leaves at 4 pm on a sunny day.
2. Shade controls the light. Cucumbers are short-day crops, and artificially shortening the light can increase the number of female flowers. Before the cucumber flower is formed, it is covered with a black shading net with a low shading rate such as black SZW-10 in summer, which can reduce the average daily temperature of the cultivation bed by 1.4 ℃, the average ground temperature of 5 cm by 2.1 ℃, and the average light intensity. 66.2%, control the daily sunshine hours within 9 hours.
3. Increase water and nitrogen fertilizer. Cucumbers grown in soil with 80% humidity are more than double the yield when grown in soil with 40% humidity. It should be ensured that cucumbers have sufficient water conditions, and water should be irrigated in time to maintain a moist environment. In the early growth and development of cucumber, if sufficient nitrogen fertilizer is guaranteed, the differentiation of female flowers can also be increased.
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