Policies for agricultural nitrogen management-trends, challenges and prospects for improved efficiency in Denmark

Tommy Dalgaard^*, Birgitte Hansen, Berit Hasler, Ole Hertel, Nicholas John Hutchings, Brian H. Jacobsen, Lars Stoumann Jensen, Brian Kronvang, Jørgen Eivind Olesen, Jan Kofod Schjørring, Ib Sillebak Kristensen, Morten Graversgaard, Mette Termansen, Henrik Vejre