1981•Journal of the Indian Society of Soil ScienceOpen access

Sodium-Calcium Exchange Equilibria in Some Salt-Affected Soils

Abdul Sahib Al Chalabi, N. S. Passicha

Abstract

Exchangeable sodium ratio (ESR)-sodium adsorption ratio (SAR) relationship was tested for three saline-sodic soils. Determination of exchange isotherms and calculation of the parameters for each soil separately in relation to their exchange behaviour was done. Equilibrium sodium adsorption ratios (SARe) obtained as intercept of ESR-SAR plot at SAR axis for the three soils were much lower than the SAR values calculated from the composition of saturation extract. Steeper slope of ESR-SAR exchange isotherm for Faganmajra soil (8.75×10−2) as compared to Kheru (4.125×l0−2) and Domeli (4.0 × 10−2) soils indicated that the former soil has a relatively high affinity for Na.

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Key concepts: Sodium adsorption ratio, Soil water, Sodium, Saturation (graph theory), Chemistry, Adsorption, Cation-exchange capacity, Salinity