实践表明,柑桔营养诊断指导施肥对提高柑桔产量有重要作用。因而,叶分析技术在我国的应用也日益广泛。但是,为了作出正确的施肥方案,则许多问题都需要通过试验研究加以解决。其中一个重要的问题是如何利用叶分析结果来判定植株需肥轻重缓急的次序。本文拟对此问题加以讨论。众所周知,在植物营养诊断中为判定营养成分的丰缺,均需一套参考标准。目前,柑桔营养诊断中采用的标准是单一元素的临界范围法。所谓临界范围,通常是指某一营养元素的允许值范围,如低于临界范围的下限或高于临界范围的上限将导致减 Practice shows that citrus nutrition diagnosis guidance fertilizer to improve the production of citrus has an important role. Therefore, the application of leaf analysis technology in our country is also increasingly widespread. However, in order to make the right fertilization program, many problems need to be solved through experimental research. One of the important issues is how to use the leaf analysis results to determine the order in which plants need to be prioritized. This article intends to discuss this issue. As we all know, in the diagnosis of plant nutrition to determine the abundance of nutrients, need a set of reference standards. At present, the standard used in citrus nutritional diagnosis is the single element critical range method. The so-called critical range, usually refers to the range of allowable values ​​of a nutrient, such as below the lower limit of the range or above the upper limit of the critical range will result in reduced