6533b7d8fe1ef96bd126b512

RESEARCH PRODUCT

Impact de la flore adventice sur la rétention des pesticides : développement d’un nouvel indicateur pour l’évaluation des systèmes de culture

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description

Weeds are usually considered as harmful for crops but they are essential for biodiversity. Indicators were already developed using the model FLORSYS (Colbach et al., 2014) to evaluate the cropping system in term of harmfullness or benefits related to weed flora. We thus propose a new indicator to evaluate the potential of pesticide retention by weed flora and its impact on pesticide transfer into the environment. The indicator is divided in two parts i) herbicide application efficiency (herbicides interception by weeds), ii) plant uptake for the others pesticides. Several cropping systems have been simulated with the FLORSYS model. Preliminary results have been analyzed using the tree regression method to study the impact of cultivation technics or its combination on the indicator. We thus try to evaluate cropping system which maximize the pesticide retention potential.