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一、缺钙黄瓜植株缺钙,在距上部生长点附近的叶片边缘发黄(即镶金边),四周下垂呈降落伞状。多数叶脉间出现白色斑,呈透明状。另外,缺钙也会形成弯曲瓜。原因是长期低温寡照,遇到天气骤晴,温度急升,加上肥力充足,土壤溶液浓度大,阻碍了黄瓜根系对钙的吸收。防治措施:一是在天气骤晴时,要适当遮阴,避免暴晒;二是发病后要叶面喷洒0.3%氯化钙水溶液,每5～7天喷1次,连喷2次。二、缺镁出现绿环叶即为缺镁。植株遇到低温时,叶缘5毫米左右呈绿色,与叶脉间的叶肉组织黄化
First, the calcium deficiency of cucumber plant calcium deficiency, in the growth of leaves from the upper edge of the yellow near the growth (that is, with gold edge), was drooping around the parachute. White spots appeared between most of the veins, showing a transparent shape. In addition, calcium deficiency will form a curved melon. The reason is that long-term low temperature sunshine, sunny weather, rapid temperature rise, coupled with adequate fertility, soil solution concentration, hinder the cucumber root absorption of calcium. Prevention and control measures: First, the weather is sunny, should be properly shaded, to avoid exposure; the second is the incidence of foliar spray 0.3% calcium chloride solution, spray every 5 to 7 days, and even spray 2 times. Second, lack of magnesium is the lack of magnesium ring green leaves. When the plants encountered low temperature, the leaf margin of about 5 mm was green, and the leaf tissue between the leaf vein yellowing