Abstract
It was found that a linear relationship exists between soluble sodium fraction and dilution, the latter defined as the fraction of soluble sodium and the total extractable sodium. This relationship could be used to recalculate soluble sodium at low soil: water ratios once the parameters of the relationship were determined. The parameters of the relationship were functions of the mineralogy and of the salinity of the soil, but not of the sodicity levels. It was found that the intercept of the relationship (soluble sodium fraction at zero water content) of soils containing easily weatherable silicates in the silt fraction was higher and more affected by salinity than that of soils which did not contain such silicates. Soils containing easily weatherable silicates had a cation exchange capacity in both clay and silt fractions. The slope of the relationship (the rate of sodium release upon dilution) was less affected by the mineralogy and salinity of the soil.
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