Abstract— This study has been conducted on the soils of irrigated perimeter of Doukkala. It is to assess the impact of the rotation of a species not mycotrophic (Beta vulgaris) with cereals on the natural resources of the mycorrhizal arbuscular fungi whose profits for the growth of plants are known. The results obtained show that this type of culture has a negative effect on the richness of the soil in spores and diversity of mycorrhizal fungi, and on the content of arbuscules which are the places of exchanges between the partners. The authors offer recommendations on cultivation practices which can be modulated in order to preserve this natural resource.
Keywords— Arbuscular mycorrhizal fungi, cultural history, Doukkala, irrigated areas, semi-arid.
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