Tuesday, November 6, 2007 - 2:00 PM
196-3

Soil Survey: Interpreting Gypsum-Containing Soils.

Robert R. Dobos and Cathy A. Seybold. USDA-NRCS, Federal Building, Room 152, 100 Centennial Mall North, Lincoln, NE 68508-3866

Soil Survey interpretations (at the national level) do not take into account the affects of gypsum in soils. The objectives are to present problems of gypsum soils on various land uses, and interpretation development and research needs. Potential hazards of soils containing gypsum include dissolution induced subsidence, piping (and karst development), corrosion, agronomic problems, and heaving. The presence of large proportions of a water soluble constituent in soils presents challenges for various land uses.  Wherever people settle, they bring a need for water and a way to dispose of wastewater, as well as possibly irrigation for environmental plantings and crops.  The stability of structures and pipelines are adversely impacted by dissolution and removal of gypsum whenever sufficient quantities of water are added to the system.  Identifying the critical limits of gypsum content in relation to the affects it has on various land uses is critically needed for interpretation development. Proposing strategies for avoiding or lessening negative impacts of gypsum presents new opportunities for soil survey.