Impact of use of As-contaminated groundwater on soil As content and paddy rice production in Bangladesh.

Arsenic (As) contamination of irrigation water and soils of Bangladesh was found to be highly variable at scales from the command area of a tubewell to nationwide. Spatial pattern in soil As at the command area scale was created as irrigation water was rapidly oxygenated and As adsorbed on precipitated ferric hydroxides. Complex relationships between irrigation water and soil As levels were found in an study of 5 upazilla. At the national scale,...