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Lookup NU author(s): Dr Simon Peacock,
Dr David Rimmer
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Red gypsum was characterized in terms of its iron oxide component, and its dissolution behavior in soil and effect on sulfate leaching were compared with pure white gypsum. Phosphate-adsorption isotherms were determined for the two gypsums, as well as for the iron oxide material. The phosphate-adsorption capacity was greatest for red gypsum powder, followed by iron oxide material and white gypsum powder. In addition, greater quantities of metal cations were adsorbed onto the red gypsum than onto the iron oxide material. Data from the column leaching study indicated that, compared to ammonium sulfate amendment, the movement of sulfate from the gypsum-amended columns was considerably less rapid, with dissolution retarded to the greatest extent by pelleted red gypsum amendment.
Author(s): Peacock S, Rimmer DL
Publication type: Article
Publication status: Published
Journal: Journal of Environmental Quality
Print publication date: 01/11/2000
ISSN (print): 0047-2425
ISSN (electronic): 1537-2537
Publisher: American Society of Agronomy, Inc.