果树生长发育所需要的各种营养元素，除氮、磷、钾外，还有多种微量元素，如铁、硼、锌、锰、镁等。诊断果树缺少哪种营养元素，一般多从“树相”判断，但正如你所说，有时不很准确。下面介绍两种诊断果树缺素症的简易方法，供你参考。１叶面施入法通过果树生长表现初步诊... Fruit tree growth and development of the various nutrients required, in addition to nitrogen, phosphorus and potassium, there are a variety of trace elements, such as iron, boron, zinc, manganese, magnesium and so on. Diagnosis of what kind of fruit tree lack of nutrients, usually more from the “tree phase” to determine, but as you said, sometimes not very accurate. Here are two easy ways to diagnose fruit tree deficiency, for your reference. 1 foliar application method through the initial performance of fruit tree growth ...