一、喷施乙烯利当黄瓜长出1~3片真叶时,第2~21节叶腋的花芽陆续分化,但尚未决定是雌花还是雄花,这时喷施乙烯利为最佳时期。喷施乙烯利的浓度一般是100~200ppm,太低起不到作用,太高会抑制花芽进一步分化而形成空节。一般喷施1~2次即可,用喷雾器在晴天下午4时,对叶片正反面进行喷雾,喷后遇雨应补喷。喷后结瓜多,应注意加强肥水管 A spray of ethephon When the cucumber grows 1 to 3 true leaves, the flower buds of the leaf axils of the second to the 21st gradually one after another, but it has not yet been decided whether the female flower or the male flower is sprayed with ethephon for the best period. The ethephon sprayed concentration is generally 100 ~ 200ppm, too low to play a role, too high will inhibit the further differentiation of flower buds and the formation of space Festival. Spray generally 1 or 2 times, with a sprayer in the sunny afternoon at 4 o’clock, the front and back of the blade spray, spray after the rain should make up spray. Spray melon and more attention should be paid to strengthen the fertilizer pipe