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Caractérisation fonctionnelle et performances d’une céréale vivace (Thinopyrum intermedium) : une alternative agroécologique pour les systèmes de grandes cultures d’Europe occidentale.

Abstract : Growing perennial grains, yielding several years from one seeding, is suggested as a valuable option toward more agroecological systems, sustaining production and environmental goals. The Thinopyrum intermedium species is studied since it may offer significant grain yields while providing other important ecosystem services regarding soil conservation and natural resources protection. The multifunctionality of the crop is a key aspect of its relevance and value, partially offsetting the lower grain yields as compared to annual grain counterparts. However, a thorough assessment of its above and belowground growth is still missing, and the influence of growth conditions mostly unknown (e.g. water, nitrogen, temperature). This lack of knowledge is strongly hindering the development of suitable management practices to ensure services provision and to increase the agroecosystem sustainability. This work assesses the crop performances in a context of a temporary insertion (2-3 years) into a grain crop rotation. The study is based on 12 fields experiments, either on-farm or in research station, in France and Belgium. This work allowed to characterize the growth and functioning of the crop and to evaluate its performances during two consecutive years (establishment and following year). Several key parameters have been identified (rooting system development, flowering induction, growth dynamic, grain yields components) to understand the potential of grain-forage dual production, soil protection, resources management, and weed control. Results are notably illustrating the crop changes between the establishment year and the following year (above and belowground biomass increase). These changes are important when analyzing the crop ability to capture and use soil resources. Generally, aboveground traits (e.g. biomass, phenology, grain yield components) and belowground traits (e.g. root depth, biomass, diameter, density) indicate an unfavorable resource allocation impacting grain productivity, while favoring the vegetative biomass (roots, stems, leaves) that supports the perenniality of the species. Meanwhile, results of this work are showing a great potential from this perennial grain to build diversified cropping systems, using and conserving resources efficiently, and supporting soil fertility.
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Submitted on : Tuesday, March 30, 2021 - 9:30:08 AM
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Olivier Duchene. Caractérisation fonctionnelle et performances d’une céréale vivace (Thinopyrum intermedium) : une alternative agroécologique pour les systèmes de grandes cultures d’Europe occidentale.. Sciences agricoles. Institut agronomique, vétérinaire et forestier de France, 2020. Français. ⟨NNT : 2020IAVF0025⟩. ⟨tel-03185018⟩

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