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Sensors 2014, 14(7), 13243-13255; doi:10.3390/s140713243
Article

Vertical Soil Profiling Using a Galvanic Contact Resistivity Scanning Approach

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Received: 22 July 2013 / Revised: 3 June 2014 / Accepted: 18 June 2014 / Published: 23 July 2014
(This article belongs to the Section Physical Sensors)
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Abstract

Proximal sensing of soil electromagnetic properties is widely used to map spatial land heterogeneity. The mapping instruments use galvanic contact, capacitive coupling or electromagnetic induction. Regardless of the type of instrument, the geometrical configuration between signal transmitting and receiving elements typically defines the shape of the depth response function. To assess vertical soil profiles, many modern instruments use multiple transmitter-receiver pairs. Alternatively, vertical electrical sounding can be used to measure changes in apparent soil electrical conductivity with depth at a specific location. This paper examines the possibility for the assessment of soil profiles using a dynamic surface galvanic contact resistivity scanning approach, with transmitting and receiving electrodes configured in an equatorial dipole-dipole array. An automated scanner system was developed and tested in agricultural fields with different soil profiles. While operating in the field, the distance between current injecting and measuring pairs of rolling electrodes was varied continuously from 40 to 190 cm. The preliminary evaluation included a comparison of scan results from 20 locations to shallow (less than 1.2 m deep) soil profiles and to a two-layer soil profile model defined using an electromagnetic induction instrument.
Keywords: galvanic contact resistivity; apparent soil electrical conductivity; on-the-go soil sensing galvanic contact resistivity; apparent soil electrical conductivity; on-the-go soil sensing
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Pan, L.; Adamchuk, V.I.; Prasher, S.; Gebbers, R.; Taylor, R.S.; Dabas, M. Vertical Soil Profiling Using a Galvanic Contact Resistivity Scanning Approach. Sensors 2014, 14, 13243-13255.

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