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Published in Soil Sci Soc Am J 38:727-732 (1974)
© 1974 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Chloride and Tritiated Water Flow in Disturbed and Undisturbed Soil Cores1

M. A. McMahon and G. W. Thomas2

ABSTRACT

Columns of disturbed and undisturbed Eden, Maury, and Pembroke soils were eluted with CaCl2 in tritiated water. The chloride was used as a substitute for nitrate since it is not affected biologically. The experiments were carried out to investigate the effects of natural soil structure on the flow of water and chloride. In all three soils flow was less stable in the undisturbed cores judging from the shape of the curve and the points of initial tritiated water and chloride breakthrough. Chloride moved through the undisturbed Eden and Maury soils faster than through the disturbed columns. Both soils exclude anions to a significant extent. In the Pembroke soil, which adsorbs anions, the chloride was retarded in the undisturbed column as compared to the disturbed column. The results suggest that field movement of water and anions is not described very well by columns of disturbed, packed soils.

NOTES

1 Contribution from the Dep. of Agronomy, Univ. of Kentucky, Lexington 40506. The research reported in this paper (no. 73-3-123) is in connection with a project of the Kentucky Agr. Exp. Sta. and is published with the approval of the Director.

2 Former Graduate Assistant, Univ. of Kentucky, now Postdoctoral Fellow, CIMMYT, Mexico, and Professor of Agron., respectively.

Received for publication February 22, 1973. Accepted for publication April 23, 1974.






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Copyright © 1974 by the Soil Science Society of America.