Geochemistry and occurrence of selenium: an overview; Selenium in seleniferous environments; Solubility, speciation, and transformations of selenium in soils; Factors affecting selenium accumulation by agricultural crops; Soil test extractants for predicting selenium in plants; Potential selenium problems in great plains soils; Selenium poisoning in livestock: a review and progress; Bioaccumulation and effects of selenium in wildlife; Element associations in soils of the San Joaquin Valley of California; Mobility and distribution of selenium and alinity in groundwater and soil of drained agricultural fields, Western San Joaquin Valley of California; A screening study of management alternatives for selenium drainage reduction in the San Joaquin Valley of California.