OPTIFLORSYS : Un outil pour aider à la conception de stratégies agroécologiques de gestion d'adventices.

Redesigning cropping systems is essential to manage weeds with few or no herbicides. The new decision support system OPTIFLORSYS combine the "virtual field" model FLORSYS with optimization algorithms. It allows optimizing cropping systems and crop ideotypes in a coherent manner and based on indicators ofweed impacts on crop production and biodiversity predicted by FLORSYS. Thus, the tool accompanies the redesign of cropping systems, identifying new management strategies. This paper first presents the OPTIFLORSYS tool, followed by three case studies aiming to optimise rotations, tillage or maize ideotypes, to illustrate the OPTIFLORSYS functioning and its contribution to redesigning cropping systems. The tool is still under development and is likely to evolve depending on, among other things, the feedback from future users.