铁是苹果树生长发育必需的微量元素。缺铁在我国黄河流域以北地区的果园里十分普遍。红富士苹果比一年生作物更容易出现缺铁症。一、症状及危害铁是叶绿素合成的必需元素，红富士苹果缺铁可引起失绿病。病症多从新梢顶端幼嫩叶片开始，初期叶片变黄，而叶脉两侧仍为绿色。随着 Iron is an essential trace element for apple tree growth and development. Iron deficiency is very common in the orchards north of the Yellow River basin in China. Red Fuji apples are more susceptible to iron deficiency than annual crops. First, the symptoms and hazards Iron is an essential element of chlorophyll synthesis, red Fuji apple iron deficiency can cause chlorosis. Symptoms and more from the shoot tip young leaves beginning, the initial leaves turn yellow, while the veins are still green on both sides. along with