果树缺铁多表现为新叶黄化或出现上黄下绿的两色叶片,严重的会造成早期落叶,重生簇叶,品质和产量都会受到影响。 据分析土壤养分发现:凡是缺铁的果园土壤中铜的含量普遍高,含量高达50—70ppm,而不缺铁的土壤中铜的含量为27—35ppm。表现为铜的含量越高,果树缺铁现象越严重。 More iron deficiency in fruit trees showed yellowing of new leaves or emergence of two-color leaves on yellowish green, which would seriously affect the early deciduous leaves and regenerated leaves. The quality and yield will be affected. According to the analysis of soil nutrients, it is found that the content of copper is generally as high as 50-70 ppm in all iron-deficient orchards but 27-35 ppm in non-iron deficient soils. The higher the content of copper, the more serious iron deficiency in fruit trees.