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Effects of Time and Leaching on Phosphate-Induced Increase in Cation Exchange Capacity in Volcanic Ash Soils¹

ABSTRACT

Incubation of phosphorus (P)-treated soils for up to 240 days had no effect on the P-induced cation exchange capacity (CEC) of subsoil samples of three volcanic ash-derived soils of southern Chile. Washing one soil with large volumes of distilled water desorbed small quantities of P but had no effect on CEC.

¹ Contribution from the Dep. of Inorganic and Analytical Chem. of the Univ. of Chile, Casilla 233, Santiago, and from the Dep. of Soil and Environ. Sci., Univ. of Calif., Riverside, CA 92521. Financial support of the U.S. NSF and Chilean CONICYT is gratefully acknowledged.

² Professor and Instructor, respectively, The Univ. of Chile; and Professor, Univ. of California.

Received for publication November 17, 1980. Accepted for publication July 11, 1981.