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。
Soil organic matter and nutrients(e. g. nitrogen, phosphorus and potassium) play important roles in soil fertility.
这些惰性物质包括：硅、钙、氯和钾等元素，其对生产的影响是显而易见的。
The inert deposits include silicon, calcium, Cl and K and their influence on production is obvious.
土壤碱解氮、速效磷和速效钾等养分的含量是指导科学施肥的重要依据之一。
The content of soil nutrients, especially available nitrogen, phosphorus and potassium is one of the important bases to instruct scientific fertilization.
应用推荐