The nutritional deficiency of Brazilian soils used in cassava cultivations is one of the main factors of production that negatively affect the national yield of this tuberous species. Although phosphorus (P) is not the macronutrient most taken up by cassava plant, it is of great importance for the crop, since it acts in the photosynthesis, storage and transfer of energy, cell division and other metabolic activities important for the development of the plant, including root growth. The cassava plant is able to associate with soil fungi, which improves the plant's ability to absorb nutrients. Thus, the objective of this research will be to evaluate the plant growth, P uptake and use efficiencies, and cassava yield in response to inoculation of arbuscular mycorrhizal fungi (AMF). The experiment will be conducted in a greenhouse in the experimental design of randomized blocks, in the 2x4 factorial scheme, with 4 replications. The treatments will be represented by two soil types (natural soil and sterile soil) and 4 rates of AMF (0, 50, 100, and 200 spores per pot). Each plot will consist of a pot with 38 dm-3. Will be evaluate: the number of leaves per plant and plant height, number, length, diameter, mean weight and yield of storage roots, accumulation of dry matter (DM) in leaves, stems, fibrous roots and storage roots, DM partitioning to the plant parts, P content and accumulation in the leaves, stems, fibrous roots, storage roots and in the whole plant, P uptake and P use efficiency, and percentage of mycorrhizal colonization in the fibrous roots. The obtained data will be submitted to analysis of variance. The means of soil types will be compared by LSD test (p0.05), while the AMF rates will be submitted to regression analysis.
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