Hauggaard-Nielsen, Henrik; Ambus, Per; Brisson, Nadine; Crozat, Yves; Dahlmann, Christoph; Dibet, Audrey; von Fragstein und Niemsdorff, Peter; Gooding, Mike; Kasyanova, Elena; Launay, Marie; Monti, Michele; Pristeri, Aurelio and Steen Jensen, Erik (2006) Pea-barley intercrops use nitrogen sources 20-30% more efficiently than the sole crops. Joint Organic Congress, Odense, Denmark, May 30-31, 2006.