福建龙眼园土壤镁素状况因土壤母质不同而异， 玄武岩发育的土壤供镁充足， 河流冲积物发育的土壤供镁尚可， 而第四纪红土， 尤其是花岗岩、凝灰岩发育的土壤供镁水平低或极低， 这些土壤是我省龙眼园土壤的主要类型， 应重视施用镁肥。田间试验结果表明， 喷施硝酸镁结合土施钙镁磷肥可矫治龙眼缺镁症。 The Mg content of soil in Fujian Longyanyuan varies with different soil parent materials. The magnesium in the basalts is sufficient for magnesium enrichment and the magnesium in the soil developed by alluvial rivers is still acceptable. However, the Mg supply in Quaternary laterite, especially in granite and tuff Low or very low, these soil is the main type of longan garden in our province, should pay attention to the application of magnesium fertilizer. Field test results show that spraying magnesium nitrate combined with soil magnesium phosphate fertilizer can cure longan magnesium deficiency disease.