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 organic matter and available potassium increased by a big margin will were vital question in the course of the fertility restoration of degenerated soil.
大幅度提高土壤有机质含量及供钾水平是退化土壤肥力恢复过程中面临的重要问题。
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