A map showing the regional distribution of Se concentrations in crops in the U. S. has been prepared, utilizing previously available and newly acquired plant analyses. The boundaries of areas on the map were based primarily on soil and geological information. In the Pacific Northwest, Northeastern United States, and the Southeastern Seaboard States, there are extensive areas where crops are generally low in Se.
The relationship of soil factors associated with reported areas of Mo toxicity in cattle in seven agriculturally important valleys in Nevada was investigated. The level of Mo in the plant was selected as a measure of the soil factors, but Cu, Co, S and P were also determined in a large number of the forage samples.The Mo content varied both with plant species and soils.
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