Interfacial contribution to two-electrode soil moisture sensor readings |
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| Authors: | M A Malicki R J Hanks |
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| Institution: | (1) Institute of Agrophysics, Polish Academy of Sciences, Do wiadczalna 4, PL-20-236 Lublin, Poland;(2) Department of Soils and Biometeorology, Utah State University, 84322 Logan, UT, USA |
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| Abstract: | Summary Contribution of electrochemical polarization, occurring at the electrode-moist soil interface, to soil moisture sensor readings is discussed for two bare electrodes or for soil moisture blocks. A soil moisture sensor can be considered as an electrolytic cell, the electrical impedance of which is the resultant of several component subimpedances arising from a diversity of phenomena causing sensor electrical polarization. It is shown that within the range of commonly applied frequencies: readings of sensors' electrical capacitance are totally masked by interfacial pseudocapacitance while the readings of the sensor electrical resistance are influenced by interfacial phenomena unless the read-out device compensates for the capacitive component of the sensor impedance. |
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