最近几年，我国各地苹果树不同程度地出现病害，主要与缺乏元素有关。现就果树缺素的症状和防治方法介绍如下：一、缺氮。苹果树缺氮时，叶小，色淡，较老的叶片呈红、紫色，早期脱落，新梢褐至红色，细而短。花芽少，叶片柄与新梢的夹角变小。解救的办法：按每株每龄施０... In recent years, apple trees in different parts of China appear disease, mainly related to the lack of elements. Symptoms and methods of prevention and treatment of fruit tree deficiency are described below: First, nitrogen deficiency. Apple tree nitrogen deficiency, leaves small, pale, older leaves were red, purple, early off, the new shoots brown to red, thin and short. Flower buds less, the angle between the blade handle and shoot smaller. Rescue method: per plant per application 0 ...