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Published in Soil Sci Soc Am J 30:498-504 (1966)
© 1966 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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The High-salt-water Dilution Method for Reclaiming Sodic Soils1

R. C. Reeve and E. J. Doering2

ABSTRACT

As a sodic soil is leached with successive dilutions of a divalent cation-containing high-salt water, exchangeable sodium is replaced by divalent cations from the leaching solution in accordance with the "valence dilution" principle. Water intake is maintained by the flocculating effect of the electrolyte in the water. Equations are derived that describe the equilibrium exchangeable-sodium-fraction of the soil and the depth of water required to effect reclamation in terms of measurable properties of the soil, and the chemical composition of the water. The suitability of a particular water for reclaiming a given soil and the depth of water required can thus be evaluated. The case of constant-rate dilution is also considered and depth of water equations are written in terms of a dilution-rate parameter B. The depth of water required to effect reclamation depends upon the ratio R of the divalent cations to the total cations in the available high-salt water, the total salt concentration of the water, and the dilution rate. The strongest dependence is upon R, with the amount of water required for reclamation decreasing markedly as R increases.

NOTES

1 Contribution from the US Salinity Laboratory, Soil and Water Conservation Research Division, ARS, USDA, Riverside, Calif. Presented before Div. S-6, Soil Science Society of America, Columbus, Ohio, Nov. 1–4, 1965.

2 Research Investigations Leader, Water Management, Corn Belt Branch, Columbus, Ohio, and Agricultural Engineer, Northern Plains Branch, Mandan, North Dakota, Soil and Water Conservation Research Division, ARS, USDA.

Received for publication September 10, 1965. Accepted for publication March 28, 1966.






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