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| DOI: | 10.2136/sssaj2009.0371 |
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| Web URL(s): | https://acsess.onlinelibrary.wiley.com/doi/10.2136/sssaj2009.0371
Last checked: 02/26/2024
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https://acsess.onlinelibrary.wiley.com/doi/epdf/10.2136/sssaj2009.0371
Last checked: 02/26/2024
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| Publication Type:
| Refereed |
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| Author(s): | Zheng, Rumei;
Li, Zizhong;
Gong, Yuanshi |
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| Author Affiliation: | Dep. of Soil and Water Sciences, China Agricultural Univ., Beijing, China |
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| Title: | A coated helical transmission line time domain transmission sensor for measuring water content in saline soils |
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| Section: | Soil physics
Other records with the "Soil physics" Section
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| Source: | Soil Science Society of America Journal. Vol. 75, No. 2, March/April 2011, p. 397-407. |
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| Publishing Information: | Madison, Wisconsin: Soil Science Society of America |
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| # of Pages: | 11 |
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| Keywords: | TIC Keywords: Equipment evaluation; Methods; Soil analysis; Soil moisture sensors; Soil salinity; Time domain reflectometry
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| Abstract/Contents: | "Soil salinity is a major challenge for soil moisture measurement using time domain reflectometry (TDR) and time domain transmission (TDT) technologies. Both technologies measure the travel time of an electromagnetic pulse propagating in soil, which is highly related to soil wetness. A TDT soil moisture sensor with coated helical transmission line has been developed and tested in nonsaline mineral soils and saline soils to evaluate its performance. For nonsaline mineral soils, a linear calibration equation between volumetric soil water content (θv) and output voltage (V) from the TDT soil moisture sensor was established, and soil texture showed minor influences on the linear relationship. The RMSE of the measured θv was smaller than <0.022 m3 m-3. Under saline conditions, the slope of the θv-V linear relationship decreased exponentially as soil solution electrical conductivity (EC) increased. When the EC is <6.6 dS m-1, however, the linear relationship for nonsaline mineral soils can be directly applied to saline soils if the required accuracy of moisture measurement is no less than 0.030 m3 m-3. For soil solution EC in the range of 6.6 to 20.6 dS m-1, the linearity of the relationship still holds, but the slope needs to be adjusted according to the EC values. The θv-V linear relationship held for soil solution EC up to 198.2 dS m-1. The calibration equation for nonsaline mineral soils was also applicable to several natural saline mineral soils, and the RMSE was <0.026 m3 m-3. Therefore it is possible to develop TDT sensors to measure soil moisture with similar accuracy to that of TDR on nonsaline soils but better performance under saline soil conditions." |
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| Language: | English |
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| References: | 43 |
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| Note: | Equation
Figures
Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Zheng, R., Z. Li, and Y. Gong. 2011. A coated helical transmission line time domain transmission sensor for measuring water content in saline soils. Soil Science Society of America Journal. 75(2):p. 397-407. |
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| DOI: 10.2136/sssaj2009.0371 |
| Web URL(s):
https://acsess.onlinelibrary.wiley.com/doi/10.2136/sssaj2009.0371
Last checked: 02/26/2024
Access conditions: Item is within a limited-access website
https://acsess.onlinelibrary.wiley.com/doi/epdf/10.2136/sssaj2009.0371
Last checked: 02/26/2024
Requires: PDF Reader
Access conditions: Item is within a limited-access website |
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MSU catalog number: b2199342a |
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