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Soil solution electrical conductivity measurements under transient conditions using Time Domain Reflectometry

Persson, Magnus LU (1997) In Soil Science Society of America Journal 61. p.997-1003
Abstract
Several studies have shown that time domain reflectometry (TDR) can be used to measure water content and solute concentration during steady-state experiments with constant soil water content. Few studies have been carried out to identify the relationship between bulk electrical conductivity (σa) and soil solution electrical conductivity (σw) to be used for transient conditions with varying water content. In this study, a single TDR probe was calibrated and found to accurately measure water content and σa. The σa measurements were fitted to σw using several previously published models. The accuracy of the σa and σw measurements increased with σa; however, the error in the σw estimation was <10% for σa higher than 5.7 mS m−1. The... (More)
Several studies have shown that time domain reflectometry (TDR) can be used to measure water content and solute concentration during steady-state experiments with constant soil water content. Few studies have been carried out to identify the relationship between bulk electrical conductivity (σa) and soil solution electrical conductivity (σw) to be used for transient conditions with varying water content. In this study, a single TDR probe was calibrated and found to accurately measure water content and σa. The σa measurements were fitted to σw using several previously published models. The accuracy of the σa and σw measurements increased with σa; however, the error in the σw estimation was <10% for σa higher than 5.7 mS m−1. The calibration was verified in a large sand column; σa measurements were fitted to σw measured in soil solution extracted with suction samplers. The calibration was also used in a transient solute transport experiment. If not accounted for, the temperature effects of the water content measurement introduce significant errors in the σw estimations. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Soil Science Society of America Journal
volume
61
pages
997 - 1003
publisher
Soil Science Society of Americ
external identifiers
  • scopus:0030609646
ISSN
0361-5995
DOI
10.2136/sssaj1997.03615995006100040001x
language
English
LU publication?
yes
id
b6400c49-d5a4-4b0d-91dd-1c2dc2418c92
date added to LUP
2018-05-29 16:13:48
date last changed
2018-06-17 05:32:39
@article{b6400c49-d5a4-4b0d-91dd-1c2dc2418c92,
  abstract     = {Several studies have shown that time domain reflectometry (TDR) can be used to measure water content and solute concentration during steady-state experiments with constant soil water content. Few studies have been carried out to identify the relationship between bulk electrical conductivity (σa) and soil solution electrical conductivity (σw) to be used for transient conditions with varying water content. In this study, a single TDR probe was calibrated and found to accurately measure water content and σa. The σa measurements were fitted to σw using several previously published models. The accuracy of the σa and σw measurements increased with σa; however, the error in the σw estimation was &lt;10% for σa higher than 5.7 mS m−1. The calibration was verified in a large sand column; σa measurements were fitted to σw measured in soil solution extracted with suction samplers. The calibration was also used in a transient solute transport experiment. If not accounted for, the temperature effects of the water content measurement introduce significant errors in the σw estimations.},
  author       = {Persson, Magnus},
  issn         = {0361-5995},
  language     = {eng},
  pages        = {997--1003},
  publisher    = {Soil Science Society of Americ},
  series       = {Soil Science Society of America Journal},
  title        = {Soil solution electrical conductivity measurements under transient conditions using Time Domain Reflectometry},
  url          = {http://dx.doi.org/10.2136/sssaj1997.03615995006100040001x},
  volume       = {61},
  year         = {1997},
}