黄瓜“花打顶”是一种生理性病害,发病后生长点附近的节间缩短,小叶片密集,各叶腋出现小瓜扭,大量雌花生长开放,造成封顶,花开后瓜条不伸长,严重影响产量。造成“花打顶”的原因很多,主要有:1.低温。夜间温度偏低,黄瓜根系发育受阻,阻碍了水分、养分的正常吸收利用,导致植株生长缓慢,造成“花打顶”。2.伤根。施入未充分腐熟的有机肥,或低 Cucumber “flower topping ” is a physiological disease, after the onset of growth near the internodes shortened, small leaflets dense, each leaf axils appear small melon twisting, a large number of female flowers grow open, resulting in capping, after the flowers are not Elongation, seriously affect the yield. Caused “flowers top” for many reasons, mainly: 1. Low temperature. Night temperatures are low, cucumber root development is hindered, hinder the normal absorption of water, nutrients, leading to slow plant growth, resulting in “flower topping ”. 2 injured root. Apply insufficiently matured organic fertilizer, or low