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Abstract
Mathematical programming models suit policy makers' needs for assessing impacts of new policies
and modellers' needs for new parameters, constraints and activities to represent the phenomenon
under study. The AROPAj model aims at taking into account any geographical extension of the
European Union as well as the continuously changing Common Agricultural Policy. As well as the
European policies will include more and more environmental problems, AROPAj will be more and
more designed toward environmental assessments. Two improvement axes are set up. Biophysical
models are used to refine the design of farming systems represented in the economic model and to
estimate nitrogen pollutant emissions. Down-scaling methods are coupled with the regional farm
group models, aiming at providing results at a fine resolution scale useful for policy evaluation and
for consistent analysis of environmental impacts calling for physical models. This helps to deal with
new challenges like renewable energy production consistently with agricultural potential and
environmental requirements.