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Published in Soil Sci Soc Am J 39:1080-1084 (1975)
© 1975 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Predicting Ionic Distributions in Large Soil Columns1

P. J. Wierenga, M. J. Shaffer, S. P. Gomez and G. A. O'Connor2

ABSTRACT

The distribution of various cations and anions was measured with depth and time in a large lysimeter column periodically irrigated with saline water. Samples of the soil solution were removed with extraction cups placed at depths of 25, 50, 75, 100, 125, and 150 cm below the soil surface in the lysimeters. Observed ionic distributions were compared with calculated values obtained by combining a transient water flow model with a chemical plate theory model. Good agreement was obtained between observed and predicted depth distribution profiles for SO42-, Cl-, Na+, and Ca2+. Soluble Mg2+ and HCO2- concentrations were overpredicted suggesting that further refinement of the chemical subroutine may be needed.

NOTES

1 Journal article no. 540, New Mexico Agric. Exp. Sta., Las Cruces, NM. 88003. Contribution from the Agronomy Department and Bureau of Reclamation, P. O. Box 25007, Denver CO. 80225. The work upon which the report was based was supported in part by funds obtained from the U.S. Department of the Interior, Office of Water Resources Research, as authorized under the Water Resources Research Act of 1964.

2 Associate Professor, New Mexico State Univ.; Soil Scientist, US Bureau of Reclamation; Research Technician, and Associate Professor, New Mexico State Univ., respectively.

Received for publication November 1, 1974. Accepted for publication August 12, 1975.






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