Casagrande, Marion; David, Christophe; Etienne, Catherine; Makowski, David; Valantin-Morison, Muriel and Jeuffroy, Marie-Hélène (2008) Agronomic and environmental factors explaining Grain Protein Content variability in organic winter wheat. Cultivating the Future Based on Science: 2nd Conference of the International Society of Organic Agriculture Research ISOFAR, Modena, Italy, June 18-20, 2008.