果树黄化苗的特征是全株叶片失掉叶绿素,呈黄白色;叶片丧失了行使光合作用的能力。致使树体生长衰弱,甚至死苗。在治疗苹果黄化苗过程中,我们对金冠树苗采取喷硫酸亚铁和尿素 The characteristic of fruit tree yellow seedling is that the whole plant leaves lose chlorophyll and appear yellowish white; the leaves lose the ability of exercising photosynthesis. Resulting in weak growth of the tree, or even dead seedlings. In the process of treatment of apple yellow seedlings, we sprayed ferrous sulfate and urea on the golden crown saplings