Efficient Amendment Use in Sodic Soil Reclamation

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Abstract
A laboratory column study of sodic soil reclamation was carried out using two soils high in exchangeable sodium percentage (ESP) and cation exchange capacity (CEC). Three amendments (CaSO4·2H2O, CaCl2·2H2O, and H2SO4) were used singly and in combination to test their effectiveness and efficiencies with respect to amount of amendment, time, and leaching needed.As a single amendment, H2SO4 is more effective than CaSO4 and results in a more desirable ESP profile than CaCl2. Combining either CaCl2 or H2SO4 with CaSO4 (proportions of ¼ and ¾, respectively) appreciably reduced the time and leaching needed to achieve reclamation as compared with CaSO4 alone. Certain soil conditions preclude or make undesirable the use of CaSO4 alone. Combining amendments results in effective reclamation and a potential savings in amendment costs.

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