Solving the Crop Allocation Problem using Hard and Soft Constraints Mahuna Akplogan, Simon de Givry, Jean-Philippe Métivier, Gauthier Quesnel, Alexandre Joannon and Frédérick Garcia RAIRO-Oper. Res., 47 2 (2013) 151-172 Published online: 18 April 2013 DOI: 10.1051/ro/2013032