Organic and conventional management of mixtures of wheat and spring cereals A.H.E.E. Kaut, H.E. Mason, A. Navabi, J.T. O'Donovan and D. Spaner Agron. Sustain. Dev., 28 3 (2008) 363-371 Published online: 07 June 2008 DOI: 10.1051/agro:2008017