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Influence of iron minerals on the determination of soil water content using dielectric techniques

Robinson, D.A.; Bell, J.P.; Batchelor, C.H.. 1994 Influence of iron minerals on the determination of soil water content using dielectric techniques. Journal of Hydrology, 161. 169-180. 10.1016/0022-1694(94)90127-9

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Abstract/Summary

Measurement of soil moisture content based on changes in dielectric constant has become a standard approach in recent years. Time domain reflectrometry (TDR), in particular, has gained rapid acceptance as a technique for measuring soil moisture that can be used in a wide range of applications. The capacitance soil moisture probe has been demonstrated also to have a large number of potential uses. One factor that dielectric soil moisture determining techniques have in common is the need for calibration. The capacitance probe needs to be calibrated for each soil type, and recent research has shown that it is advisable for the same strategy to be adopted with time domain reflectometers. Results presented show the influence that iron minerals such as magnetite, haematite and goethite can have on the calibration of time domain reflectometers and capacitance probes. Magnetite shows the greatest effect by causing an uncertainty of up to 60% in the estimation of volumetric water content in the presence of 15% magnetite.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/0022-1694(94)90127-9
Programmes: CEH Programmes pre-2009 publications > Other
CEH Sections: _ Pre-2000 sections
ISSN: 0022-1694
NORA Subject Terms: Agriculture and Soil Science
Hydrology
Date made live: 29 May 2012 12:53
URI: http://nora.nerc.ac.uk/id/eprint/12781

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