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Title:   Author  item
                                            Schwartz, Robertitem
                                            Evett, Steven

                                                         - *Steve*item
                                            Pelletier, Mathew
  Submitted to: ASA-CSSA-SSSA Annual Meeting Abstracts
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 5/31/2010
                                    Publication  Date: 10/31/2010
                                    Citation: Schwartz, R.C., Evett, S.R., Pelletier, M.G. 2010. Column displacement experiments to evaluate electrical conductivity effects on electromagnetic soil water sensing [abstract]. In: ASA-CSSA-SSSA Annual Meeting Abstracts, October 31-November 4, 2010, Long Beach, California. Paper No. 301-7. 2010 CDROM.Interpretive Summary:
                                Technical Abstract: Bulk electrical conductivity (EC) in superactive soils has been shown to strongly influence electromagnetic sensing of permittivity. However, these effects are dependent on soil water content and temperature as well as the pore water conductivity. We carried out isothermal column displacement experiments at saturation to evaluate the influence of changes in bulk EC on soil permittivity measurements with time domain reflectometry (TDR) and a capacitance sensor (TE-5). Changes in permittivity inferred by TDR measurements could be properly described using the phase velocity equation for transversal electromagnetic waves. In contrast, permitivities measured using capacitance sensors exhibited a negative response to bulk EC in a fine sand and a positive response in a clay loam.


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