症状: 黄瓜在保护地栽培条件下化瓜现象要比露地栽培严重得多,尤其是冬春茬栽培的黄瓜化瓜更多。其表现为刚坐下的瓜纽或正在发育中的小瓜条生长停止,并由瓜尖开始逐渐变黄、干瘪,最后干枯、脱落。 发生原因: 1)谢花时灌水过多,土壤通气不良,根系的活力减弱,或大瓜摘得过晚,各器官争夺养分、养分供给不足。 2)日光温室冬春茬栽培,气温较低,再遇上连续阴雨雪天,光照不足,光合能力低,光合产物少,刚坐下的幼瓜或生长中的小瓜条得不到所需要的营养物质而停止生长。 3)光照不足,温度偏高,特别是夜间温度高,光合产物少而呼吸消耗多,造成瓜条缺少营养。 Symptoms: cucumber cultivation in the protective conditions of melon phenomenon is much more serious than the open field cultivation, especially in winter and spring cultivation of cucumber melon more. The performance of fresh Gui Nu sit or is in the development of small Guagua growth stopped, and from the melon began to turn yellow, shriveled, and finally dry off. Reasons: 1) Thanks for too much irrigation, poor soil aeration, weakening of the root system, or large melon picked too late, the organs compete for nutrients, nutrient insufficiency. 2) winter and spring crop cultivation in the greenhouse, the temperature is low, then meet the continuous rainy and snowy days, lack of light, low photosynthetic capacity, less photosynthetic products, squatting just squatting or growing small squash are not needed Of nutrients to stop growing. 3) Lack of light, high temperature, especially at night, high temperature, less photosynthetic products and respiratory consumption, resulting in the lack of nutrition Guar.