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Introduire une espèce de diversification dans les systèmes de culture d’un territoire : articuler production de connaissances et conception dans des dispositifs multi-acteurs. Cas de la cameline dans l’Oise.

Abstract : Crop diversification, which is a way to ensure agroecological transition, raises a major question: how to produce, at low cost, knowledge on these minor species, often poorly studied by agronomic research?Here, we proposed and implemented an approach combining design and knowledge production, within different multi-stakeholders platforms, to support the introduction of new species into cropping systems. The case study of camelina, introduced either as a main crop or as a second crop in the cropping systems of the Oise department, in the context of the development of a local oilseed biorefinery, was used.First, we combined a multi-stakeholders workshop - bringing together farmers, advisors, researchers, agronomist from agricultural R&D and industrials - with on-farm trials on camelina crop management routes as second crop, designed, managed and appraised by farmers themselves. This approach made it possible to identify knowledge gaps (e.g. the previous effect of the camelina on sugar beet), but also to produce knowledge useful for design (e.g. decision-making rules).In parallel, we (researchers) designed and evaluated, within a multi-environments on-farm trials network, three herbicide-free crop management routes for spring camelina. Our results show that increasing camelina sowing rates or intercropping camelina with another species (barley or peas) are effective agroecological ways to control weeds in camelina crop. In addition, the diagnosis of the variability of the yield, the oil seed content, and the fatty acid composition, carried out within the same experimental network, made it possible to identify (i) the main explaining factors (e.g. nitrogen status of the crop for yield), and (ii) environmental conditions (e.g. supply of mineral nitrogen from the soil) and practices (e.g. species intercropping) determining these factors.This knowledge production led, during a design workshop, to broaden the range of modalities of introduction and management of camelina designed by farmers.Finally, we discuss how this original combination of multi-stakeholder platforms makes it possible (i) to produce at a lower cost located and generic knowledge, useful for design, and (ii) to equip both the farmer-designer, the agricultural advisor and the researcher, to support crop diversification within a territory.
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Submitted on : Sunday, January 3, 2021 - 1:01:33 AM
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  • HAL Id : tel-03092837, version 1

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Margot Leclere. Introduire une espèce de diversification dans les systèmes de culture d’un territoire : articuler production de connaissances et conception dans des dispositifs multi-acteurs. Cas de la cameline dans l’Oise.. Agronomie. Université Paris Saclay (COmUE), 2019. Français. ⟨NNT : 2019SACLA028⟩. ⟨tel-03092837⟩

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