宁南地区土壤的风化发育程度较低，腐殖化微弱，淋溶强度小，侵蚀强烈，导致土壤有机质贫乏，质地较砂，保水保肥能力低，营养元素的有效性差。调查分析表明，土壤钾素营养丰富，氮、磷素含量低，对植物供应能力明显不足；微量元素除铜外，均表现为严重缺乏 The weathering and development of the soil in Ningnan are lower, the humification is weak, the leaching strength is small and the erosion is strong, resulting in the poor soil organic matter, sand texture, water retention and fertility, and the poor availability of nutrients. The investigation and analysis showed that soil potassium is rich in nutrients, with low content of nitrogen and phosphorus, and obviously insufficient supply of plant resources. Trace elements, except for copper, show a serious lack of