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Desodification of a salt-affected soil in plots of various sizes under two modes of water application

Published online by Cambridge University Press:  27 March 2009

I. S. Dahiya ,
K. S. Grewal  and
D. J. Dahiya
I. S. Dahiya
Affiliation:
Department of Soils, Haryana Agricultural University, Hisar, Haryana, India
K. S. Grewal
Affiliation:
Department of Soils, Haryana Agricultural University, Hisar, Haryana, India
D. J. Dahiya
Affiliation:
Department of Soils, Haryana Agricultural University, Hisar, Haryana, India
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Summary

Desodification of a highly saline-sodic, permeable, sandy loam soil was accomplished in 2 × 2 m (S1), 4 × 4 m (S2) and 6 × 6 m (S3) plots under continuous and intermittent ponding. The soil contained large amounts of soluble salts and exchangeable sodium throughout the profile to the water table. The chief salts were chlorides and sulphates of sodium, calcium, and magnesium. The leaching curves with respect to desodification did not differ significantly between the S1, S2 and S3 plots under continuous ponding but did under intermittent ponding. With intermittent ponding, the efficiency of leaching exchangeable sodium in the S1 plots was very significantly higher than that in the S2 and S3 plots, i.e. the leaching efficiency decreased sharply with increased plot size. The leaching efficiency in the S1 plots was significantly greater with intermittent than with continuous ponding, but the reverse was true in the S2 and S3 plots. The results further indicated that there is no need to apply an amendment such as gypsum, mainly because calcium and magnesium present in such soils are adequate to replace the initially high exchangeable sodium during leaching. The displacement of exchangeable sodium in the S1 plots under intermittent ponding was nearly piston-like. With increased plot size, it tended to deviate from this behaviour. It is concluded that under practical situations in which reclamation is accomplished in large plots, the practice of leaching the saline constituents with intermittent ponding would be less effective. Thus, leaching of salts down into the soil with a single heavy irrigation would be more desirable.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 108 , Issue 2 , April 1987 , pp. 453 - 458
Copyright
Copyright © Cambridge University Press 1987

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