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This article in SSSAJ

  1. Vol. 53 No. 1, p. 74-79
     
    Received: May 31, 1988


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doi:10.2136/sssaj1989.03615995005300010014x

New Calibrations for Determining Soil Electrical Conductivity—Depth Relations from Electromagnetic Measurements

  1. J. D. Rhoades ,
  2. S. M. Lesch,
  3. P. J. Shouse and
  4. W. J. Alves
  1. USDA-ARS, U.S. Salinity Lab., 4500 Glenwood Dr., Riverside, CA 92501

Abstract

Abstract

Soil salinity can be determined in the field from measurements of soil electrical conductivity (ECa). Measurements of depth-integrated ECa can be made remotely using electromagnetic induction (EM) techniques. A means of determining ECa for the soil depth intervals of 0 to 30, 30 to 60, 60 to 90 cm, etc., from the EM measurements is needed for salinity appraisal. The EM and ECa measurements were made at about 900 sites in the San Joaquin Valley of California. This large data set was used, along with rigorous statistical techniques, to obtain empirical coefficients used in equations to predict ECa by depth intervals within the soil profile from EM readings taken above ground. Predictions were found to be more accurate using these new coefficients rather than those previously available.

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