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Miscible displacement of reactive solutes in saline-sodic soils under varying flow conditions

Published online by Cambridge University Press:  27 March 2009

I. S. Dahiya ,
I. P. Abrol  and
S. Hajrasuliha
I. S. Dahiya
Affiliation:
U.N.D.P. Centre of Soil and Water Management, Haryana Agricultural University, Hissar, Haryana, India
I. P. Abrol
Affiliation:
Division of Soils and Agronomy, Central Soil Salinity Research Institute, Karnal, Haryana, India
S. Hajrasuliha
Affiliation:
Institute of Horticulture, University of Isfahan, Iran
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Summary

The paper reports a laboratory study on miscible displacement of reactive solutes during leaching a highly saline-sodic soil rich in soluble sodium carbonate with solutions of calcium chloride. The effect of varying flow velocities, initial soil moisture content and concentration of calcium in the leaching water on the extent of carbonate precipitation and replacement of sodium by calcium from the exchange positions was studied in soil columns. The results showed that precipitation of soluble carbonates in the soil increased with increasing flow velocity, initial soil moisture content and concentration of calcium in the leaching solution. The results further showed that the calcium exchange capacity of the soil was reduced significantly and nearly proportionally with decrease in the degree of water saturation as a consequence of decreased water application rate and initial soil moisture content. In view of the results obtained, a simple model to describe calcium-sodium exchange under unsaturated flow conditions in saline-sodic soils under consideration has been proposed. Possible implications of the results in actual field situations is discussed.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 94 , Issue 3 , June 1980 , pp. 709 - 714
Copyright
Copyright © Cambridge University Press 1980

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