缺铁:果树缺铁时,叶子变黄,发生黄叶病,新梢顶端叶子由黄变白。以后逐渐向下发展,严重时只有叶脉还保留一些绿色,其它部分全部变白,干枯死亡。对缺铁果树,可结合深翻施入有机肥,适量加入硫酸亚铁,也可在果树生长季节叶面喷施0.2％硫酸亚铁,每隔10～15天喷一次,连喷2～3次。 Iron deficiency: iron deficiency in fruit trees, the leaves turn yellow, the occurrence of yellow leaf disease, the tip of the shoot from yellow to white. After the gradual downward development, in serious cases only the veins also retain some green, all other parts of the white, dry death. For iron-deficient fruit trees, combined with deep turning into organic fertilizer, appropriate amount of ferrous sulfate addition, 0.2% ferrous sulfate can also be sprayed on the foliage of the growing season of fruit trees, spraying once every 10 to 15 days, even spraying 2 to 3 Times.