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Efficient Amendment Use in Sodic Soil Reclamation¹

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 and , 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.

¹ Contribution from the USDA, Science & Education Admin. U. S. Salinity Laboratory, Riverside, Ca 92501.

² Soil Scientist, Chemist, Research Leader, and Visiting Soil Scientist respectively. The permanent address of H. Frenkel is Inst. of Soils & Water, Volcani Center, P. O. Box 6, Bet Dagan, Israel.

Received for publication March 27, 1978. Accepted for publication May 25, 1978.

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