http://orgprints.org/7292/ Environmental and economic modelling of organic, stockless, horticultural crop rotations Selected results from the ongoing “EU-Rotate_N” research project are presented. This EU 5th-framework project is developing a model-based decision support system to optimise nitrogen use in horticultural crop rotations across Europe. This paper introduces the economic and the fertility-building crops sub-models, and shows data from model validation and first model runs on an organic farm in central England. Preliminary results show that the model has the potential to be a powerful support tool for farmers and advisors, making decisions on rotational plan-ning. The economic, agronomic and environmental consequences of different rotational designs can be projected and assessed in detail. Schmutz, Dr Ulrich Rayns, Dr Francis Firth, Mr Chris Rosenfeld, Dr Anton Thorup-Kristensen, Dr Kristian Zhang, Dr Kefeng Rahn, Dr Clive farm_nutrient_management 5emissions 2farmecon int_conf_joint2006_4 Environmental and economic modelling of organic, stockless, horticultural crop rotations 2006-05-09 Schmutz, Dr Ulrich; Rayns, Dr Francis; Firth, Mr Chris; Rosenfeld, Dr Anton; Thorup-Kristensen, Dr Kristian; Zhang, Dr Kefeng and Rahn, Dr Clive (2006) Environmental and economic modelling of organic, stockless, horticultural crop rotations. Joint Organic Congress, Odense, Denmark, May 30-31, 2006. application/pdf