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The suitability of an iron oxide-rich gypsum by-product as a soil amendment

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.

Publication metadata

Author(s): Peacock S, Rimmer DL

Publication type: Article

Publication status: Published

Journal: Journal of Environmental Quality

Year: 2000

Volume: 29

Issue: 6

Pages: 1969-1975

Print publication date: 01/11/2000

ISSN (print): 0047-2425

ISSN (electronic): 1537-2537

Publisher: American Society of Agronomy, Inc.