花木在生长发育过程中需要大量的氮、磷、钾、钙、镁等元素,同时还需要很少的铁、锰、锌、铜等微量元素。花卉缺少某种元素时,就会表现出相应的缺素症状。缺氮时,生长势弱,叶色浅绿,基部叶片发黄或呈浅褐色。缺磷时,叶片蓝绿且略带紫色。缺钾时,老叶片浅绿,叶尖端褐色。缺铁时,植株矮小,新叶叶肉变 Flowers and trees in the process of growth and development need a lot of nitrogen, phosphorus, potassium, calcium, magnesium and other elements, but also requires little iron, manganese, zinc, copper and other trace elements. Flowers lack of a certain element, it will show the corresponding lack of symptoms. Nitrogen deficiency, the growth potential weak, light green leaves, the base leaves yellow or pale brown. When phosphorus is lacking, the leaves are blue-greenish and purplish. Potassium deficiency, the old leaves light green, tip brown. Iron deficiency, plant short, the new leaves change