Nitrate storage in unsaturated zone quantified

To estimate nitrate stored in the unsaturated zone on a global scale between 1900 and 2000, the British Geological Survey (BGS) linked mathematical models of nitrate leaching from the base of the soil zone with estimates of groundwater recharge, unsaturated-zone porosity, and the depth to groundwater.

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http://www.ngwa.org/Media-Center/news/Pages/2017-11-21-British-Geological-Survey.aspx

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