HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Amrhein, C. Articles by Suarez, D. L. Search for Related Content PubMed Articles by Amrhein, C. Articles by Suarez, D. L. Agricola Articles by Amrhein, C. Articles by Suarez, D. L.

Procedure for Determining Sodium-Calcium Selectivity in Calcareous and Gypsiferous Soils

Dep. of Soil and Environmental Science, Univ. of California, Riverside, CA 92521

D. L. Suarez

U.S. Salinity Lab., 4500 Glenwood Dr., Riverside, CA 92501

*Corresponding author.

ABSTRACT

A procedure to determine the exchanger-phase composition (and thus the Na/Ca selectivity) of calcareous and gypsiferous soils was developed and tested on three soils and three phyllosilicate minerals. The procedure corrects for anion exclusion and mineral weathering by measuring the Cl, SO₄, and HCO₃ in the soil solution and in the extracting solution. Anion exclusion was found to be significant in the montmorillonite system, but generally less than 10% of the cation-exchange capacity in the soil, illite, and vermiculite systems. Mineral weathering contributed significantly to the total extracted Ca. Thus, exchangeable-Ca values were overestimated by 30 to 500% in the gypsiferous soils and 3 to 20% in the calcareous soils when weathering was neglected. The proposed method allows the determination of cation-exchange capacity, exchangeable-cation composition, and anion exclusion at any solution composition, concentration, and pH.

Contribution from the U.S. Salinity Lab., Riverside, CA.

Received for publication June 7, 1989.

This article has been cited by other articles:

				T. M. DeSutter, G. M. Pierzynski, and L. R. Baker Flow-Through and Batch Methods for Determining Calcium-Magnesium and Magnesium-Calcium Selectivity Soil Sci. Soc. Am. J., February 27, 2006; 70(2): 550 - 554. [Abstract] [Full Text] [PDF]

				I. Lebron, D. L. Suarez, and T. Yoshida Gypsum Effect on the Aggregate Size and Geometry of Three Sodic Soils Under Reclamation Soil Sci. Soc. Am. J., January 1, 2002; 66(1): 92 - 98. [Abstract] [Full Text] [PDF]