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Master Thesis

Étude des champignons mycorhiziens arbusculaires des sols en systèmes de grandes cultures biologiques sans élevage : application à la nutrition phosphatée

Abstract : Most plants, including crops, live with Arbuscular Mycorrhizal Fungi (AMF). This symbiosis gives crops a better access to nutriments, especially phosphorus, element whose availability is shrinking the most in organic fields soils. In organic stockless systems, phosphorus fertility management is a great deal due to the prohibition of synthetic inputs and the lack of livestock effluents. Therefore, these systems rely on biological recycling pathways such as AMF symbiosis. In the work package ‘Mycorrhizae’ of Innov’AB project, we investigated three long term field experiments, in France, in order to answer two questions. The first one was to determine if organic systems, differentiated by varied phosphorus fertilization inputs, have different impacts on the soils AMF capacity to colonize pea roots under controlled conditions (trap-culture). We showed a negative relation between the P Olsen and the mycorrhization rate, and between the P Olsen and the number of arbuscules. We did not succeed at explaining the phosphorus content and the biomass of peas. The second one was to know if mycorrhization rate could be a pertinent indicator of the impact of the farming system on the soils phosphorus fertility. We found that it was able to ‘reflect’ the farming system, especially in phosphorus fertility terms, but its interpretation was not easy because of the numerous interactions between parameters.
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Master Thesis
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Diane Rivaton. Étude des champignons mycorhiziens arbusculaires des sols en systèmes de grandes cultures biologiques sans élevage : application à la nutrition phosphatée. Sciences du Vivant [q-bio]. 2016. ⟨dumas-01472700⟩

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