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Soil science
That science dealing with soils as a natural resource on the surface of the earth including soil formation, classification and mapping; physical, chemical, biological, and fertility properties of soils per se; and these properties in relation to the use and management of soils.
土壤学的贡献者
Soil science
分之百万 (PPM)
地球科学; 土壤学
(i) 浓度的解决方案每百万的重量或质量单位的解决方案 (溶解的物质) 溶质的重量或质量单位表示的。(ii) A 浓度在固体中重量或每百万的重量或质量单位的固体,如土壤所含物质的质量单位表示。 ...