soil element background values 土壤元素背景值
soil environmental background values 土壤环境背景值
The atlas of China soil background values was briefly introduced in this paper.
简要介绍了中国土壤背景值图集。
We identified the most appropriate proportion of nutrients by analyzing the soil background values.
通过对土壤背景值的测定，找出最合适的营养物质配比。
In conventional soil environment quality evaluation, the regional soil background values or the contents in the soil control points of evaluated region were used as evaluation criteria.
以往土壤环境质量评价中，一般是以区域土壤背景值或评价区土壤对照点含量作为评价标准。
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