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一、因缺乏元素引起的生理性病害 1.缺钙 其典型症状为叶的边缘失绿变黄,随着缺钙的继续,叶缘黄色部分会向内侧不断扩大。在温室中出现的“降落伞”叶也是由于缺钙引起的。“降落伞”叶的叶缘黄化,整张叶子四周下垂,呈“降落伞”状。钙是同镁一起随着水分的吸收而进入
First, due to lack of physiological elements caused by the disease 1. Calcium deficiency of the typical symptoms of the edge of the leaves turn green yellow, with the continued calcium deficiency, leaves the yellow part of the medial will continue to expand. The “parachute” leaves that appear in the greenhouse are also caused by calcium deficiency. “Parachute” leaf edge yellowing, the entire leaf hanging around, was “parachute” shape. Calcium is with magnesium along with the absorption of water into