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The Stability of Different Forms of Selenium Applied to Low-Selenium Soils¹

ABSTRACT

In some acid-to-neutral soils, water-soluble selenite salts react rapidly with the solid phase to form a relatively insoluble adsorption complex. The Se in this complex is less available to alfalfa (Medicago sativa L. ‘Dupuit’) than the Se added to the same soil as Fe(OH)₃-HSeO₃. In other soils, or in some acid soils limed to neutrality, the availability of Se to alfalfa from NaHSeO₃ and from Fe(OH)₃-HSeO₃ is essentially the same. The availability of Se from Se^o added to the same soils is less than from either NaHSeO₃ or Fe(OH)₃-HSeO₃ sources. Oxidation of Se^o is initially rapid in these soils, and does not seem to be pH dependent, but the rate of oxidation varies in different soils. Soluble selenite may be the most practical form of Se to add to low-Se soils in order to produce crops containing sufficient Se to meet animal requirements.

Contribution from the U.S. Plant, Soil and Nutrition Laboratory, Soil and Water Conservation Research Division, ARS, USDA, in cooperation with the Dept. of Agronomy, Cornell Univ., Ithaca, N.Y. 14850. Agronomy Paper no. 859. Presented before Div. S-2, Soil Science Society of America, Washington, D.C., Nov. 1967.

² Chemist and Research Soil Scientist, USDA, Ithaca, N.Y., respectively.

Received for publication November 18, 1969. Accepted for publication February 20, 1969.