Soil organic matter and nutrients(e. g. nitrogen, phosphorus and potassium) play important roles in soil fertility.
土壤有机质和养分（氮、磷和钾等）是土壤肥力重要的物质基础。
Management of potassium resources refers to the rational application of potassic fertilizers and also includes the preservation of potassium fertility in the soil and its effective use.
钾素资源管理不仅指钾肥的合理施用，也包含了土壤中钾素肥力的保持和有效利用。
The analytical data revealed that the potential fertility of the dryland soils was rather low, such as nitrogen, phosphorus and potassium content in soil were deficient on the whole.
分析数据表明，该区旱地土壤潜在肥力较低，有机质含量差异较大，大部分土壤氮、磷、钾养分供应不足。
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