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Most of the nitrogen in the Elbe comes from wastewater, based on isotopic composition

Values of measured isotope composition δ15N: 3.5 ‰ commercial synthetic fertilisers, 3.5-9 ‰ mineral soil nitrogen, over 9 ‰ animal and human faeces. (Source: authors of the article)
Most of the nitrogen in the Elbe comes from wastewater, based on isotopic composition
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