Coexistence between GM and non-GM maize : explaining the repartition of crops and coexistence means used in 2007

Setting up coexistence between GM (Genetically Modified) and non GM (NGM) crops means insuring that there is no cross pollination during production in order to respect a 0.9% threshold of GM in non GM material. We focused our work on improving a model of farmer’s varietal choice (Coleno, 2008), which combined with a spatially-explicit population gene flow model (Angevin et al., 2008) evaluates the consequences of different scenarios of segregation strategies on maize mixing from the plot to the silo. Our objective in this study was to know whether the adoption of GM maize in a farm had an effect on resources allocations or not. We also wanted to identify under what conditions was the GM maize cropped and in which farms and what was the allocation of GM and NGM maize in the farm in order to improve the model.