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Effect of Magnesium on the Hydraulic Conductivity of Na-Smectite-Sand Mixtures

Published online by Cambridge University Press:  02 April 2024

I. Shainberg ,
N. Alperovitch  and
R. Keren
I. Shainberg
Affiliation:
Institute of Soils and Water, Agricultural Research Organization, The Volcani Center, P.O. Box 6, Bet Dagan 50-250, Israel
N. Alperovitch
Affiliation:
Institute of Soils and Water, Agricultural Research Organization, The Volcani Center, P.O. Box 6, Bet Dagan 50-250, Israel
R. Keren
Affiliation:
Institute of Soils and Water, Agricultural Research Organization, The Volcani Center, P.O. Box 6, Bet Dagan 50-250, Israel
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Abstract

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Changes in hydraulic conductivity (HC) and clay dispersion of smectite-sand mixtures as a function of exchangeable Na in Na-Ca and Na-Mg systems were measured. The charge density on the smectites had no effect on Na-Ca and Na-Mg equilibrium, and the affinity of the clays for Na was similar in both systems. A decrease in HC at 0.01 M concentration was found to be due to clay swelling. Mg was found to be less effective than Ca in preventing the breakdown of the packets by low concentrations of exchangeable Na, and Na-Mg-smectite swelled more than Na-Ca-smectites.

Na-Mg-clay particles dispersed more readily than Na-Ca-clay particles when the mixtures were leached with distilled water; however, if the electrolyte concentration in the clay-sand mixture was controlled by the leaching solutions, no difference between the Na-Mg- and Na-Ca-clays was noted. Thus, the effect of Mg on clay mixtures leached with distilled water was apparently due to the effect of Mg on the hydrolysis of the clays. Increase in charge density increased the stability of the R2+ clay packets, and higher concentrations of Na were needed to break the packets. Mg was less effective than Ca in stabilizing the packets, and lower concentrations of Na were needed to break the Mg-packets.

Keywords

Charge densityDispersionHydraulic conductivityMagnesiumSalinitySmectiteSwelling
Type
Research Article
Information
Clays and Clay Minerals , Volume 36 , Issue 5 , October 1988 , pp. 432 - 438
Copyright
Copyright © 1988, The Clay Minerals Society

Footnotes

1

Contribution from the Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel. 2066-E, 1987 series.

References

Abder-Rahman, W. and Rowell, D. L., 1979 The influence of Mg in saline and sodic soils: A specific effect or a problem of cation exchange J. Soil Sci. 30 535 – 546.CrossRefGoogle Scholar
Alperovitch, N., Shainberg, I. and Keren, R., 1981 Specific effect of magnesium on the hydraulic conductivity of sodic soils J. Soil Sci. 32 543 – 554.CrossRefGoogle Scholar
Alperovitch, N., Shainberg, I., Keren, R. and Singer, M. J., 1985 Effect of clay mineralogy and Al and Fe oxides on the hydraulic conductivity of clay-sand mixtures Clays & Clay Minerals 33 443 – 450.CrossRefGoogle Scholar
Chi, C. L., Emerson, W. W. and Lewis, D. G., 1977 Exchangeable calcium, magnesium and sodium and the dispersion of illites in water. I. Characterization of illites and exchange reactions Aust. J. Soil Res. 15 255 – 263.Google Scholar
Emerson, W. W. and Chi, C. L., 1977 Exchangeable Ca, Mg and Na and the dispersion of illites. II. Dispersion of illites in water Aust. J. Soil Sci. 15 255 – 263.Google Scholar
Frenkel, H., Goertzen, J. O. and Rhoades, J. D., 1978 Effects of clay type and content, exchangeable sodium percentage and electrolyte concentration on clay dispersion and soil hydraulic conductivity Soil Sci. Soc. Amer. J. 42 32 – 39.CrossRefGoogle Scholar
Kreit, J. F., Shainberg, I. and Herbillon, A. J., 1982 Hydrolysis and decomposition of hectorites in dilute salt solutions Clays & Clay Minerals 30 223 – 231.CrossRefGoogle Scholar
Levy, R. and Shainberg, I., 1972 Ca/Mg exchange in montmorillonite and vermiculite Clays & Clay Minerals 20 37 – 46.CrossRefGoogle Scholar
Low, P.F., 1980 The wetting of clay: II. Montmorillonites Soil Sci. Soc. Amer. J. 44 667 – 676.CrossRefGoogle Scholar
McNeal, B. L., Layfield, D. A., Norvell, W. A. and Rhoades, J. D., 1968 Factors influencing hydraulic conductivity of soils in the presence of mixed-salt solutions Soil Sci. Soc. Amer. Proc. 32 187 – 190.CrossRefGoogle Scholar
Norrish, K., 1954 The swelling of montmorillonites Disc. Faraday Soc. 18 120 – 134.CrossRefGoogle Scholar
Oster, J. D., Shainberg, I. and Wood, J. D., 1980 Flocculation value and gel structure of Na/Ca montmorillonite and illite suspension Soil Sci. Soc. Amer. J. 44 955 – 959.CrossRefGoogle Scholar
Pupisky, H. and Shainberg, I., 1979 Salt effects on the hydraulic conductivity of a sandy soil Soil Sci. Soc. Amer. J. 43 429 – 433.CrossRefGoogle Scholar
Quirk, J. P. and Schofield, R. K., 1955 The effect of electrolyte concentration on soil permeability J. Soil Sci. 6 163 – 178.CrossRefGoogle Scholar
Rengasamy, P., Green, R. S. B. and Ford, G. W., 1986 Influence of Mg on aggregate stability in sodic red earths Aust. J. Soil Res. 24 229 – 237.CrossRefGoogle Scholar
Shainberg, I., Alperovitch, N. and Keren, R., 1987 Charge density and Na/K/Ca exchange on smectites Clays & Clay Minerals 35 68 – 73.CrossRefGoogle Scholar
Shainberg, I. and Letey, J., 1984 Response of soils to sodic and saline conditions Hilgardia 52 1 – 57.CrossRefGoogle Scholar
U.S. Salinity Laboratory Staff (1954) Diagnosis and improvement of saline and alkali soils: U.S. Dep. Agric. Handbk. 60, 160 pp.Google Scholar