花卉的生长需要多种营养素，如果一旦缺乏某种营养时，便会在植株上反映出来：缺氮植株发育不良，茎枝细弱瘦而薄，色淡绿，下部老叶呈淡黄色，继而干枯而呈褐色，但并不脱落。缺磷其植株呈深暗绿色，叶柄变紫，发育迟缓，老叶的叶脉间出现黄色，叶易脱落。缺钾老叶出现黄、棕 Flower growth requires a variety of nutrients, if the lack of certain nutrients, it will be reflected in the plant: nitrogen deficiency plant hypoplasia, stem thin thin and thin, pale green, the lower part of the old leaves pale yellow, and then dry And brown, but does not fall off. Phosphorus deficiency plants dark green, petiole becomes purple, stunted, yellow leaves between the old leaves, leaves easy to fall off. Potassium deficiency leaves appear yellow, brown