Trace element distribution and mobilization in Scottish soils with particular reference to cobalt, copper and molybdenum

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Abstract
Total and extractable trace element contents have been determined in about 1000 soil profiles representing the main soil series occurring throughout Scotland. The frequency distributions of a number of trace elements in these soils are described and some relationships between total and extractable contents discussed. The geological nature of the soil parent material, soil texture, organic matter content and environmental contamination are the principal factors controlling soil total contents. Soil drainage class, because of its effect on mineral weathering and soil oxidation-reduction conditions, has a major influence on soil extractable contents, availability to plants and crop uptake. Particular attention is paid to cobalt, copper and molybdenum because of their importance for animal health in Scotland.