N J Hutchings, O-K Nielsen, T Dalgaard, M H Mikkelsen, C D Børgesen, M Thomsen, T Ellermann, A L Højberg, L Mogensen and M Winther
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Environ. Res. Lett. 9 115012

A nitrogen (N) budget for Denmark has been developed for the years 1990 to 2010, describing the inputs and outputs at the national scale and the internal flows between relevant sectors of the economy. Significant reductions in inputs of reactive N have been achieved during these 20 years, decreasing nitrate leaching by about half. Measures to limit ammonia emissions have also reduced gaseous emissions of reactive N. The budget was used to frame a discussion of the potential for further reductions in losses of reactive N to the environment.