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The effects of salt concentration (C) and sodicity, as measured by the sodium adsorption ratio (SAR), on boron retention by three arid-zone smectic soil samples were studied. The samples were previously equilibrated with NaCl-CaCl2, mixed salt solutions of different SAR to attain specific SAR values. Boron (B) retention generally decreased with decreasing pH and increasing C as the latter was accompanied with significant decrease in pH. When the pH was kept nearly constant, B retention slightly increased with increasing C. Sodicity generally tended to enhance the salt effect, but it had a significantly negative effect on B retention only at the highest SAR value used in this experiment.