Observatoire de parcelles agricoles pour évaluer la diversité des adventices dans des légumineuses et les blés suivants

Abstract : Weeds have been found to be the main limiting factor for the yield of legumes and the following wheat in a farmers’ field observatory in Burgundy. The aim of our study was (i) to characterize the effect of legumes (spring pea/alfalfa) and their crop management (conventional/organic) on weed flora, and (ii) to evaluate the previous effect of legumes on the following crop (wheat). Here we consider the weed functional diversity to understand their response to agricultural practices and identify agronomic levers in order to regulate them, but also to preserve non-harmful biodiversity associated with crops. There are few differences in abundance and diversity of weeds between organic and conventional alfalfa, while for peas, the indices are generally lower in conventional. There is a clear distinction in weed flora between alfalfa and peas, with a higher floral diversity in organic management for both legumes. The crop management has a greater impact than the previous legume on the weed flora composition of the following wheat, even if there is a proximity between the previous legumes and the following wheat. Finally, for peas, tillage impacts the abundance of weed functional groups more than herbicide TFI.
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Safia Médiène, Maude Quinio, Arnaud Butier, Mathieu Bazot, Marie-Helene Jeuffroy, et al.. Observatoire de parcelles agricoles pour évaluer la diversité des adventices dans des légumineuses et les blés suivants. Innovations Agronomiques, INRA, 2019, 74, pp.121-127. ⟨10.15454/rmastk⟩. ⟨hal-02349951⟩

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