二、肥害、缺素症及其防治措施肥害及缺素症是施肥不当而引起的黄瓜生理性病害。中上部叶缘呈整齐的“镶金边”,组织一般不坏死,上部叶骤然变小,部分叶片呈“降落伞”,生长点紧缩,多是由于施肥过多,土壤溶液浓度过大而造成叶片盐分的积聚,挖出根系可见根已变锈色,根尖钝;中部叶 Second, fat, lack of disease and its prevention and control Fertilizer and deficiency disease is cucumber physiological disease caused by improper fertilization. In the middle and upper leaf margin neatly “inlaid with gold”, the organization is generally not necrosis, the upper leaves suddenly become smaller, part of the leaves were “parachutes”, the growth point of tightening, mostly due to excessive fertilization, soil solution concentration is too large and cause leaf salt The accumulation of dug up the root visible roots have become rusty, root tip blunt; middle leaves