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Rapid Determination of Exchangeable Bases, Acidity, and Base Saturation for Soil Characterization¹

ABSTRACT

Routine, rapid, soil-testing procedures were used for measuring both exchangeable bases and exchangeable acidity. Exchangeable bases were extracted by a single wash with a dilute HCl + H₂SO₄ solution and analyzed by flame spectrophotometry and atomic absorption. Exchangeable acidity was determined by the pH change of a buffered solution-soil suspension. The values obtained compared favorably with values determined by NH₄OAc, NaOAc, and BaCl₂-triethanolamine and were suitable for separation of Ultisols from Alfisols and mollic from umbric epipedons.

¹ Contribution from Department of Agronomy and Soils, Auburn University Agricultural Exp. Sta., Auburn, Alabama 36830.

² Assistant Professor and Professors, respectively.

Received for publication August 20, 1971. Accepted for publication February 14, 1972.