background value of soil element
土壤元素背景值 background value of soil element 水环境背景值（水环境本底值） water environmental background value ..
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The main result of study is as follows: (1) Citrus orchard soil greyish brown purple mud constant element background value in Jiangjin.
主要研究结果如下：(1)江津市柑橘果园土壤灰棕紫泥常量元素背景值。
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The background value of Beryllium element in soil of China was studied.
本文介绍了我国土壤中铍的背景值结果。
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