Selenium Accumulation in Astragalus Species

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Abstract
Some Astragalus species are known to be Se accumulators and are toxic to grazing animals. The Western Regional Plant Introduction Station, Pullman, Wash., had 108 accessions representing 49 species of Astragalus, mostly of non‐North American origin, available for this study. The Se accumulation characteristics of these had not been determined and therefore their potential as forage in areas of seleniferous soil was open to question.Plants were greenhouse grown in soil containing 18 ppm Se. The forage was dried and analyzed for total Se by AOAC methods.Selenium content varied from a high of 213 ppm in Astragalus tephrosoides Boiss. to a low of no detectable Se in 45 accessions. Sixty accessions, representing 26 species, accumulated 5 ppm Se or more and could be poisonous to grazing animals.

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