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１９９０～１９９２年对贵州柑桔主产区的农场果园进行４０个园次叶片及土壤养分含量分析，初步提出贵州甜橙叶片主要元素含量的适宜范围：氮２．３％～３．０％，磷０．１２～０．１７％，钾１．１％～２．０％，钙２．６％～０．３６％；并探明了叶片各元素含量的变异系数以及氮与叶片主要元素含量之间的平均比值（氮：磷：钾：钙：镁为１：０．０６：０．５４：１．１８：０．１１），以上指标可作为贵州甜橙叶片营养诊断标准之参考。柑桔树体内１１种营养元素中，以磷素对其它元素的影响最为广泛和重要，其次是钾素．钙、硼、钼３元素在土壤有效含量与柑桔叶片含量间存在密切相关性，其中钼呈极显著负相关，显示这些元素在土壤和柑桔营养之间的重要性。
From 1990 to 1992, the analysis of nutrient contents of 40 orchards and soil nutrients in farm orchards in the main citrus producing areas of Guizhou showed that the optimal range of main elements of Guizhou sweet orange leaves was 2.3% -3.0% of nitrogen, Phosphorus 0.12-0.17%, Potassium 1.1-2.0%, Calcium 2.6% -0.36%. The coefficient of variation of each element and the contents of nitrogen and main elements in leaves (Nitrogen: phosphorus: potassium: calcium: magnesium 1: 0.06: 0.54: 1.18: 0.11), the above indexes can be used as a reference for the nutrition diagnosis of Guizhou sweet orange leaves. Citrus tree body of 11 kinds of nutrients, with phosphorus on the other elements of the most widespread and important, followed by potassium. The contents of calcium, boron and molybdenum in soil were closely related to the content of citrus leaves. Among them, molybdenum showed extremely significant negative correlation, indicating the importance of these elements in soil and citrus nutrition.