在苹果树生长过程中,由于养分供应及运输等方面存在问题,引起某种营养元素不同程度地缺乏,出现生长和结果异常,表现缺素症,肉眼判断比较直观。但在生产实际中,往往会因气候、用药、病害等因素的影响,表现出的症状与缺素症容易混淆,常会导致判断失误。笔者根据实际观察,现就这一 In the process of apple tree growth, due to the problems of nutrient supply and transportation, some kinds of nutrient elements are caused to some extent, the growth and abnormal results appear, the performance of the lack of disease, visual judgment more intuitive. However, in actual production, often due to climate, medication, disease and other factors, the symptoms and signs of easy confusion, often lead to misjudgment. The author based on actual observation, is this one