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Evidence for Sodium Fixation in Salt-Affected Soils¹

ABSTRACT

Evidence from isotopic dilution studies is presented to show that adsorbed Na in salt-affected soils may be exchangeable with Na isotopes but nonexchangeable with Ca⁺⁺ or NH₄⁺ ions. The evidence also shows that a solid form of Na may be present in these soils which disolves in normal extracting solutions but not in water.

¹ This paper is based on work performed under contract number AT – (11-1) – 34 Project 23, with the U. S. Atomic Energy Commission.

² Assistant Professor, Department of Soils and Plant Nutrition, University of California, Berkeley.

Received for publication August 19, 1959. Accepted for publication September 17, 1959.