Application of a crop-farm-indicators modelling chain to assess the impact of the EU nitrate directive in the Midi Pyrenees region

10. Congress of the European Society for Agronomy: Multi-functional Agriculture - Agriculture as a Resource for Energy and Environmental Preservation, 2008/09/15-19, Bologna (Italie)International audienceThe rapid evolution of economie and environmental constraints on farming systems require cropping systems design or assessment to be conducted in the context of market instability as well as economie (c.g. CAP in EU) and environmental policy changes. The Nitrate Directive (91/676/EC) is one of the oIdest EU environmental policy, designed to reduce water pollution by nitrate from agricultural sources, through a set of measures, defined at regional level, and mandatory for farmers of vulnerable zones