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This publication deals with soil erosion and sedimentation. Soil erosion and associated sediment deposition are natural landscape-forming processes that can be greatly accelerated by human intervention through deforestation, overgrazing, and non-sustainable farming practices. Soil erosion and sedimentation may not only cause on-site degradation of the natural resource base, but also off-site problems— downstream sediment deposition in fields, floodplains and water bodies, water pollution, eutrophication and reservoir siltation, etc. —with serious environmental and economic impairment. There is an urgent need for accurate information to quantify the problem and to underpin the selection of effective soil-conservation technologies and sedimentation-remediation strategies, including assessment of environmental and economic impacts. Existing classical techniques to document soil erosion are capable of meeting some of these needs, but they all possess important limitations. The quest for alternative techniques for assessing soil erosion, to complement existing methods, directed attention to the use of environmental radionuclides, in particular fallout as tracers to quantify rates and establish patterns of soil redistribution within the landscape. The concept of a project on the use of environmental radionuclides to quantify soil redistribution was first formulated at an Advisory Group Meeting convened in Vienna, April 1993, by the International Atomic Energy Agency (IAEA).

Soil erosion --- Sedimentation and deposition --- Radioactive tracers in soil science. --- Measurement. --- Radioactive tracers in soil science --- Measurement --- Ressource en sol --- Soil resources --- Érosion hydrique --- Water erosion --- Sédimentation --- sedimentation --- Trait morphologique du sol --- soil morphological features --- Stabilisation du sol --- Soil stabilization --- Modèle --- Models --- Gestion des ressources --- resource management --- Conservation des sols --- Soil conservation --- Lutte antiérosion --- erosion control --- Agriculture --- Earth & Environmental Sciences --- Agriculture - General --- Environmental Sciences and Forestry. Soil Science --- Land degradation and Land conservation --- Erosion --- Erosion. --- sedimentation. --- Environmental management. --- Agriculture. --- Environmental sciences. --- Soil science. --- Soil conservation. --- Hydrogeology. --- Environmental Management. --- Environmental Science and Engineering. --- Soil Science & Conservation. --- Geohydrology --- Geology --- Hydrology --- Groundwater --- Conservation of soil --- Erosion control, Soil --- Soil erosion control --- Soils --- Agricultural conservation --- Soil management --- Pedology (Soil science) --- Earth sciences --- Environmental science --- Science --- Farming --- Husbandry --- Industrial arts --- Life sciences --- Food supply --- Land use, Rural --- Environmental stewardship --- Stewardship, Environmental --- Environmental sciences --- Management --- Control --- Prevention --- Conservation --- Soil erosion. --- Soil erosion - Measurement --- Sedimentation and deposition - Measurement

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Phosphate fertilizers --- Phosphate fertilizers --- Tracer techniques --- Tracer techniques --- Application methods --- Application methods --- Plant response --- Plant response --- soil fertility --- soil fertility --- evaluation. --- evaluation

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MEXIQUE --- SOCIOLOGIE GENERALE --- GEOGRAPHIE POLITIQUE --- MEXIQUE --- SOCIOLOGIE GENERALE --- GEOGRAPHIE POLITIQUE

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