缺氮:主要表现在整株和老叶片上。从整株看,表现为发育不良,茎枝细弱,叶瘦小而薄、呈淡绿色。下部老叶开始时呈淡黄色,随后干枯呈褐色,但枯叶一般附着不脱落。缺磷:表现在整株呈浓绿色。有些花木叶柄有变紫的现象,植株发育迟缓,基部老叶脉间出现黄化,枯叶易脱落。 Nitrogen deficiency: mainly in the whole plant and the old leaves. From the whole plant, manifested as dysplasia, stem thin, thin and thin leaf, pale green. Lower part of the old leaves began to light yellow, then dry brown, but the leaves generally do not fall off attached. P deficiency: the whole plant was dark green. Some flower petiole purple phenomenon, plant retardation, the base of the old veins appear yellow, dead leaves fall off easily.