Poster De Conférence Année : 2025

Linking Agricultural Management to Soil Microbial Dynamics: How Organic Matter, Biocontrol, and Crop Management Shape Soil Ecology

Résumé

Understanding the influence of agricultural practices on the interactions between plants and soil microorganisms is crucial for developing new approaches that support the agroecological transition. In this context, farmers from the Carbon 'N' Caux group in Normandy are exploring innovative ways to manage their farms effectively while promoting agricultural practices that improve soil health. Three farm platforms were established through three sites to assess the impact of alternative farming systems on soil biological functioning: (1) the application of exogenous organic matter (livestock manure and green waste compost), (2) methods of cover crop destruction (chemical destruction using glyphosate and mechanical destruction using a harrow), and (3) the reduction in the use of phytosanitary products (comparison between phytosanitary products and biocontrol products). Multi-year monitoring (2020-2023) was conducted using a range of bioindicators, including fungal and bacterial abundance, enzyme activities (β-glucosidase, alkaline phosphatase, N-acetyl-glucosaminidase) and mycorrhizal symbiosis (spores abundance and mycorrhizal colonization). The results showed that organic matter inputs positively influenced soil microbial communities, enhancing enzymatic activities and mycorrhizal colonization, with a continous increase in these bioindicators observed since 2021. Biocontrol products demonstrated beneficial effects on microbial communities, significantly increasing spores abundance and mycorrhizal colonization from 2021 to 2023. In contrast, cover crop destruction methods negatively impacted fungal and bacterial abundance in the soil, although glyphosate showed a more positive effect on mycorrhizal colonization compared to harrowing. This study provides farmers and agricultural advisors with valuable insights into soil biological functioning, encouraging the adoption of sustainable farming practices to maintain soil health and productivity.

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hal-05159649 , version 1 (12-07-2025)

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  • HAL Id : hal-05159649 , version 1

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Babacar Thioye, Wassila Riah-Anglet, Lisa Castel, Anne Cauchois, Mélanie Bressan, et al.. Linking Agricultural Management to Soil Microbial Dynamics: How Organic Matter, Biocontrol, and Crop Management Shape Soil Ecology. Ecology of Soil Microorganisms, Jun 2025, Helsiinki, Finland. ⟨hal-05159649⟩
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