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Applied and Environmental Soil Science
Volume 2012, Article ID 506951, 7 pages
Research Article

Effect of Land Application of Phosphorus-Saturated Gypsum on Soil Phosphorus in a Laboratory Incubation

1USDA, National Institute of Food and Agriculture, Waterfront Centre, Washington, DC 20024, USA
2Department of Environmental Science and Technology, University of Maryland, College Park, MD 20742, USA
3Department of Plant and Soil Sciences, Oklahoma State University, Stillwater, OK 74078, USA
4USDA, Agricultural Research Service, Bldg. 3702, Curtin Road, University Park, PA 16802, USA

Received 6 July 2011; Revised 11 October 2011; Accepted 29 October 2011

Academic Editor: Artemi Cerda

Copyright © 2011 Karen L. Grubb et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Agricultural drainage ditches can deliver high loads of phosphorus (P) to surface water. Installation of filter structures containing P sorbing materials (PSMs), including gypsum, is an emerging practice that has shown promise to reduce these P loads. The objective of this study was to evaluate what effect soil amendment with gypsum would have on soil P concentrations and forms in a laboratory incubation experiment. Gypsum was saturated at two levels with P, and applied to a silt loam and a sandy loam at two rates. The treated soils were incubated in the laboratory at 25°C, and samples were collected on eight dates between 0 and 183 days after amendment. Spent gypsum application did not significantly increase soil water-extractable or Mehlich 3 P when applied at typical agronomic rates. This appears to be a viable strategy to remove P from agricultural drainage waters but does not appear to provide any additional P fertilizer value.