近二十年来,国外营养诊断的研究进展迅速,许多国家已进入生产实际应用阶段,使果树的产量和质量得到不断提高。国内外对营养诊断的方法进行过多方面的研究,比较准确可靠的方法是田间试验,但因田间试验的工作比较复杂,过程也较长,在各种土壤类型上都设置田间试验,也有一定困难。因此,近年来国内外广泛采用叶分析方 In the recent two decades, the research on nutrition diagnosis abroad has been progressing rapidly. Many countries have entered the practical application stage of production, and the yield and quality of fruit trees have been continuously improved. There are many ways to diagnose nutrition in China and abroad. The more accurate and reliable method is the field test. However, because the work of field test is complicated and the process is long, field tests are set on various soil types and there are certain difficult. Therefore, in recent years, extensive use of leaf analysis at home and abroad