缺镁:叶肉呈线条状或块状失绿,幼叶有肋骨状隆起,逐渐向叶身中部发展;沿主脉向叶身的基部保存有一个“人”字形失绿区,余下的区域呈现黄色或灰绿色;结的果实小、味淡、略有苦味。 缺铁:幼叶肉黄化,但叶脉呈绿色且经久不退,脉纹清晰可见,叶柄基部呈紫色或红褐色斑点、并常伴有坏死部分:缺铁严重时叶小而薄、叶肉由黄色到黄白色、再变为乳白色,同时还出现网状细脉、随病情恶化叶脉失绿、呈现黄色;叶片上有棕色枯斑。并发生枯顶现象。 Lack of magnesium: the leaves were linear or massive green, young leaves ribbed uplift, and gradually developed to the middle of the leaf blade; along the main vein to the base of the blade to save a “human” green-shaped zone, the remaining area Yellow or gray-green; knot of fruit is small, light, slightly bitter taste. Iron deficiency: young leaves yellow, but veins green and durable, veins clearly visible petiole base purple or reddish-brown spots, and often accompanied by necrosis part: severe iron deficiency is small and thin, leaf from yellow To the yellow-white, and then into the milky white, but also appeared reticular veins, with the deterioration of the veins chlorosis, showing yellow; brown spots on the leaves. And the phenomenon of dry top.