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This article in SSSAJ

  1. Vol. 70 No. 6, p. 2075-2085
     
    Received: Dec 14, 2005
    Published: Nov, 2006


    * Corresponding author(s): jhi@aragon.es
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doi:10.2136/sssaj2005.0405

Incorporating Electromagnetic Induction Methods into Regional Soil Salinity Survey of Irrigation Districts

  1. J. Noguésa,
  2. D. A. Robinsonb and
  3. J. Herrero *a
  1. a Soils and Irrigation Dep., Agri-Research Center of Aragon, PO Box 727, 50080 Zaragoza, Spain
    b Dep. of Geophysics, Stanford Univ., 397 Panama Mall, Stanford CA 94305-2215

Abstract

Many land use decisions are made without the aid of soil maps in countries without National soil surveys. The purpose of this research was to create a soil survey delineating salinity phases at a regional scale that could serve as the basis for improved decision making, or highlight areas for further investigation. Soil salinity survey at a regional scale remains a challenge. We demonstrate a survey methodology suited to small fields, often found in Europe and developing countries, and present a streamlined survey methodology making this typically labor-intensive process more efficient. A regional soil survey was conducted at a scale of 1:25 000, mapping consociations and complexes of soil series. The soil survey information was then used to guide an electromagnetic induction (EMI) survey of the soils with observed salinity, to delineate phases. A calibration method for estimating the electrical conductivity of the extract of the saturated paste (ECe) from the EMI measurements was devised. After testing several statistical methods, a single calibration of the EMI data was found to be suitable using a nonparametric regression. The use of the EMI method reduced operation costs, where time, personnel, analysis time, and budget are limitations.

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Copyright © 2006. Soil Science SocietySoil Science Society of America