近几年来,我国柑桔生产大发展,产量逐年上升。但生产上普遍存在着偏施氮素化肥的现象,致使出现多种类型的柑桔缺素症状。下面仅介绍生产上比较普遍的四种微量元索缺乏症状及防治方法,供生产实践参考。 In recent years, the great development of citrus production in China, the output increased year by year. However, there is a widespread phenomenon of partial nitrogen fertilization in production, resulting in many types of symptoms of citrus deficiency. The following describes only the production of the more common four kinds of trace elements lack of symptoms and prevention methods for the production of practical reference.