Policies for agricultural nitrogen management—trends, challenges and prospects for improved efficiency in Denmark by Tommy Dalgaard, Birgitte Hansen, Berit Hasler, Ole Hertel, Nicholas J Hutchings, Brian H Jacobsen, Lars Stoumann Jensen, Brian Kronvang, Jørgen E Olesen, Jan K Schjørring, Ib Sillebak Kristensen, Morten Graversgaard, Mette Termansen, Henrik Vejre

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