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1979～1982年对我省乌龙岭、福眼等龙眼主栽品种营养诊断方法进行了探讨。根据龙眼的生物学特性、叶片营养组分的年周期变化及其与产量的相关性,提出龙眼叶片分析以1月份采摘夏梢营养枝顶端第3片复叶的中部小叶为宜。文中初步提出龙眼丰产的叶片营养的适量范围(1月份):氮以1.70%(按干物质计)以上,磷0.12～0.20%,镁0.20～0.30%为宜;钾、钙含量与产量虽无相关性,但高产者叶片含钾量多为0.60～0.80%,合钙量多为1.50～2.50%。
From 1979 to 1982, the methods of nutritional diagnosis of longan cultivars in Wulongling and Fuyan were analyzed. According to the biological characteristics of longan, annual changes of nutrient components of leaves and its correlation with yield, it was suggested that the analysis of longan leaf should be based on picking the middle leaflets of the third leaf of the top of summer shoots in January. The optimum range of leaf nutrition for longan (January) is preliminarily proposed: nitrogen is more than 1.70% (by dry matter), phosphorus is 0.12-0.20% and magnesium is 0.20-0.30%; potassium, calcium content and yield are not However, the leaves of high-yielding individuals had 0.60-0.8% potassium and 1.50-2.50% calcium.