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Soil properties influencing apparent electrical conductivity: A review
Year:
2005
Authors :
Friedman, Samuel
;
.
Volume :
46
Co-Authors:
Friedman, S.P., Inst. Soil, Water and Environ. Sci., Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Facilitators :
From page:
45
To page:
70
(
Total pages:
26
)
Abstract:
The most common method for in situ assessment of soil salinity, namely the electrical conductivity (EC) of the soil solution (ECw), is to measure the apparent electrical conductivity (ECa) and volumetric water content (θ) of the soil and apply measured or predicted EC a(ECw, θ) calibration curves. The water content and electrical conductivity of a soil solution are indeed the major factors affecting its apparent electrical conductivity, which justifies the assessment of salinity from apparent EC measurements. However, the ECa(EC w, θ) relationship depends on some additional soil and environmental attributes affecting the soil ECa. Non-spherical particle shapes and a broad particle-size distribution tend to decrease EC a, and when non-spherical particles have some preferential alignment in space, the soil becomes anisotropic, i.e., its ECa depends on the direction in which it is measured. The electrical conductance of adsorbed counterions constitutes a major contribution to the ECa of medium- and fine-textured soils, especially under conditions of low solution conductivity. In such soils and with such salinity levels, the temperature response of the soil ECa should be stronger than that of its free solution, and care should be taken when extrapolating from field-measured ECa values to obtain the ECa at a given temperature. The above-mentioned and other secondary findings should, on one hand, indicate some limitations for the application of existing ECa-ECw models, and, on the other hand, can serve as guidelines for further development of such essential models. © 2004 Elsevier B.V. All rights reserved.
Note:
Related Files :
calibration
electric conductivity
salinity
Soils
Volumetric water content
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More details
DOI :
10.1016/j.compag.2004.11.001
Article number:
Affiliations:
Database:
Scopus
Publication Type:
Review
;
.
Language:
English
Editors' remarks:
ID:
20031
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:33
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Scientific Publication
Soil properties influencing apparent electrical conductivity: A review
46
Friedman, S.P., Inst. Soil, Water and Environ. Sci., Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Soil properties influencing apparent electrical conductivity: A review
The most common method for in situ assessment of soil salinity, namely the electrical conductivity (EC) of the soil solution (ECw), is to measure the apparent electrical conductivity (ECa) and volumetric water content (θ) of the soil and apply measured or predicted EC a(ECw, θ) calibration curves. The water content and electrical conductivity of a soil solution are indeed the major factors affecting its apparent electrical conductivity, which justifies the assessment of salinity from apparent EC measurements. However, the ECa(EC w, θ) relationship depends on some additional soil and environmental attributes affecting the soil ECa. Non-spherical particle shapes and a broad particle-size distribution tend to decrease EC a, and when non-spherical particles have some preferential alignment in space, the soil becomes anisotropic, i.e., its ECa depends on the direction in which it is measured. The electrical conductance of adsorbed counterions constitutes a major contribution to the ECa of medium- and fine-textured soils, especially under conditions of low solution conductivity. In such soils and with such salinity levels, the temperature response of the soil ECa should be stronger than that of its free solution, and care should be taken when extrapolating from field-measured ECa values to obtain the ECa at a given temperature. The above-mentioned and other secondary findings should, on one hand, indicate some limitations for the application of existing ECa-ECw models, and, on the other hand, can serve as guidelines for further development of such essential models. © 2004 Elsevier B.V. All rights reserved.
Scientific Publication
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