[Evaluation of study in cereal crop with ITCF [Institut Technique des Cereales et des Fourrages]: how to prepare the farms to live in tomorrow agriculture [Synergie 2000; model CLEAN]]

cargas variables cereal crops charge variable conduite de la culture control de enfermedades crop management cultivos de cereales disease control extension extension activities farm inputs farm management france francia gestion de l'exploitation agricole insumos agricolas manejo de fincas manejo del cultivo modele modelos models moyen de production agricole triticum variable costs vulgarisation