Effect of land application of phosphorus-saturated gypsum on soil phosphorus in a laboratory incubation

Karen L. Grubb, Joshua M. McGrath, Chad J. Penn, Ray B. Bryant

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

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.

Original languageEnglish (US)
Article number506951
JournalApplied and Environmental Soil Science
Volume2012
DOIs
StatePublished - Dec 1 2012

All Science Journal Classification (ASJC) codes

  • Soil Science
  • Earth-Surface Processes

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