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Comparaison de méthodes de conception de systèmes de culture innovants pour la gestion durable des adventices

Abstract : Three methods of innovative design for cropping systems were compared for their contribution to sustainable weed management: (i) de novo expert design by multiple stakeholders; co-design by farmers (ii) of one cropping system during workshops; (iii) of cropping systems for each farmer member of a DEPHY network group over several years. The weed simulation model FLORSYS was used to evaluate these systems with six indicators, describing weed harmfulness for crop production, weed contribution to biodiversity and herbicide use. A principal component analysis on this dataset illustrated that there is no correlation between herbicide use and weed harmfulness for crop production. De novo expert design led to bigger changes in practices and systems performances, compared to co-design with farmers, especially when innovative systems are designed for each farmer of a group. The evolution of sustainability of these cropping systems was assessed with the multicriteria assessment model DEXiPM and again more changes, often positive, were found with the design methods (i) and (ii). However, only a few innovative cropping systems designed with method (iii) were able to reduce weed harmfulness for production while enhancing sustainability, thanks to major changes planned in crop sequences (winter wheat reduction and sugarbeet removal), after ten years of step-by-step design. These results illustrate differences and complementarities of these design methods.
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Submitted on : Tuesday, June 15, 2021 - 4:07:16 PM
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Nicolas Cavan, Bertrand Omon, Aurélie Tailleur, Sophie Dubois, Wilfried Queyrel, et al.. Comparaison de méthodes de conception de systèmes de culture innovants pour la gestion durable des adventices. Innovations Agronomiques, INRAE, 2020, CoSAC, un projet pour la Conception de Stratégies durables de gestion des Adventices dans un contexte de Changement (climat, pratiques agricoles, biodiversité), 81, pp.189-200. ⟨10.15454/gas3-1w19⟩. ⟨hal-02321831⟩

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