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Leaching of salts as affected by the method of water application and atmospheric evaporativity under shallow and saline water-table conditions

Published online by Cambridge University Press:  27 March 2009

P. S. Minhas  and
B. K. Khosla
P. S. Minhas
Affiliation:
Central Soil Salinity Research Institute, Karnal-132001, India
B. K. Khosla
Affiliation:
Central Soil Salinity Research Institute, Karnal-132001, India
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Summary

Field studies on leaching a highly saline sandy loam soil having a shallow groundwater table showed that application of 150 mm water in two equal parts at 10 days interval had no distinct advantage over a single application of the whole amount. On the contrary, the surface-accumulated salts were displaced to a lesser extent and the salt peak remained at a shallower depth under split application, particularly during periods of high atmospheric evaporativity when the leached salts tended to move upward between successive water applications. A soil mulch created by shallow tillage reduced evaporation losses and curtailed upward movement of salts, resulting in nearly 10% increase in leaching efficiency. Significantly a small quantity of water (0·41 cm leaching water per unit soil depth) sufficed for 70% chloride removal, indicating that under the prevailing conditions a larger fraction of the pores contributed to the leaching process. A compact layer, having a bulk density of 1·69 g/cm3, at the soil surface, also appeared to be related to the higher leaching efficiency by maintaining a preponderance of unsaturated flow.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 109 , Issue 3 , December 1987 , pp. 415 - 419
Copyright
Copyright © Cambridge University Press 1987

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