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Published in Soil Sci Soc Am J 38:576-581 (1974)
© 1974 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Assessing Soil Salinity and Identifying Potential Saline-Seep Areas with Field Soil Resistance Measurements1

A. D. Halvorson and J. D. Rhoades2

ABSTRACT

The recent widespread increase in the occurrence of seep areas high in salinity in the northern Great Plains has increased the need for soil salinity research. The objective of the study was to examine the use of soil conductivity values calculated from resistance measurements obtained with the four-probe-Wenner electrode configuration to identify potential saline-seep areas and estimate soil salinity in the field.

Plots of apparent soil conductivity (ECa) vs inner-electrode spacing (a) yielded different types of curves for saline-seep areas, recharge areas, and intermediate areas. Plots of ECa vs a or ECa values alone can be used to identify potential saline-seep areas. Significant correlations were obtained in May (r = 0.98) and August (r = 0.96) between apparent soil conductivity (ECa) and electrical conductivity of saturation extracts (ECse) showing that four-probe soil resistance measurements can also be used to estimate soil salinity (ECse) in the field.

NOTES

1 Contribution from the Western Region, Agr. Res. Ser., USDA, in cooperation with the Mont. Agr. Exp. Sta., Journal Series no. 454.

2 Soil Scientists, USDA-ARS, Sidney, Mont. 59270, and US Salinity Laboratory, Riverside, Calif. 92502, respectively.

Received for publication November 6, 1973. Accepted for publication March 14, 1974.






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