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Selenium Concentrations in Alfalfa from Several Sources Applied to a Low Selenium, Alkaline Soil¹

ABSTRACT

Two laboratory-prepared ferric hydroxy bi-selenites and CuSeO₃ applied to Portneuf silt loam in the field provided slowly available Se to alfalfa, resulting in Se concentration adequate but nontoxic for livestock. These materials have potential as Se fertilizers at low application rates. The ferric hydroxy bi-selenites offer little or no advantage over CuSeO₃. Se from BaSeO₄ alone, BaSeO₄-BaSO₄ mixtures, and CuSeO₄ was absorbed by alfalfa in concentrations toxic to livestock. A small fraction of applied elemental Se was available immediately after application, providing adequate Se to alfalfa for livestock. The remaining elemental Se was rather inert, and supplies only slightly more Se to alfalfa than did the untreated soil the year following application.

¹ Contribution from the Northwest Branch, Soil and Water Conservation Research Division, ARS, USDA, Idaho Agr. Exp. Sta. cooperating.

² Research Soil Scientist and Soil Scientists, respectively, Snake River Conservation Research Center, Kimberly, Idaho 83341.

Received for publication February 10, 1969. Accepted for publication June 17, 1969.