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Published in Soil Sci Soc Am J 31:172-176 (1967)
© 1967 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of Dilution on Calcium and Potassium Contents of Soil Solutions1

F. E. Khasawneh and Fred Adams2

ABSTRACT

The effect of dilution on the composition of a soil solution of Magnolia sandy clay loam subsoil was investigated. Samples of a Ca- and K-saturated soil as well as samples of a soil saturated with K and mixed with CaCl2 were equilibrated with water in various soil-water ratios. Equilibrium solutions were separated and analyzed for Ca and K. Dilution increased the total amount of solution electrolytes with a concurrent change in the relative amount of each of the solution cations. The following equation was derived from Langmuir's isotherm to describe the desorption of neutral salts from soil surfaces: S = St V/(a + V) where S is the total meq of solution cations in volume V ml, and St and a are constants.

The ratio-law of Schofield was adequate to describe the change in the relative amount of each cation upon dilution of one soil system, but a correction term was added to the formulation of the ratio-law in order to describe the data of the other soil system. This formulation of the ratio-law is given as
Figure 1
where m is the number of solution mmoles, V is the solution volume in ml, and k and h are constants. The two foregoing equations provide the means for predicting the composition of a soil solution upon dilution.

NOTES

1 Contribution from the Agronomy and Soils Dep., Auburn Univ. Agri. Exp. Sta, Auburn, Alabama.

2 Former Graduate Student, now postdoctoral Research Associate at Purdue University, and Professor of Soils, respectively.

Received for publication October 17, 1965. Accepted for publication December 27, 1966.






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