Comparison of Geonics EM38 and Dualem 1S electromagnetic induction sensors for the measurement of salinity and other soil properties
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Date
2012
Authors
Urdánoz Melado, VicenteAragüés Lafarga, Ramón
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ArticleAbstract
The electromagnetic induction (EMI) Geonics EM38 (G-EM38) and Dualem 1S (D-1S) sensors are used frequently for assessment of soil salinity and other soil characteristics in irrigated agriculture. We compared these two sensors to determine whether they could be used interchangeably for the measurement of apparent soil electrical conductivity (ECa) in horizontal (ECa-h) and vertical (ECa-v)
coil receiver modes. Readings were taken at 201 locations identified in three irrigation districts in both modes, and statistical comparisons were made on the raw data and from maps of a 2-ha irrigated field
made using 1680 horizontal mode readings. Both sensors gave the same ECa-v readings (mean GEM38 and D-1S difference = 0), whereas the ECa-h readings were slightly greater with the Geonics EM38 than with the Dualem D-1S (mean difference = 0.075 and 0.05 dS ⁄m for the 201 and 1680
observations, respectively). The degree of coincidence between both sensors for soil profile ECa classification was acceptable: 82% for normal profiles (i.e. ECa-h ⁄ ECa-v < 0.9) and 90% for inverted
profiles (i.e. ECa-h ⁄ ECa-v > 1.1). In practical terms, Geonics EM38 and Dualem 1S sensors could be used interchangeably with similar or very close results
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Keywords
Soil apparent electrical conductivity, Electromagnetic induction, Soil profile classification, Soil mapping, Soil classification, Soil use and management
Bibliographic citation
V. Urdanoz; R. Aragüés. "Comparison of Geonics EM38 and Dualem 1S electromagnetic induction sensors for the measurement of salinity and other soil properties". Soil use and management. 2012, vol. 28, p. 108-112
Other field subjects
SensoresSalinidad del suelo
Manejo del suelo
Características morfológicas suelo
Suelos y riegos