SSSAJ Journal of Natural Resources and Life Sciences Education
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Published in Soil Sci Soc Am J 37:851-855 (1973)
© 1973 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Carlson, R. M.
Right arrow Articles by Buchanan, J. R.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Carlson, R. M.
Right arrow Articles by Buchanan, J. R.
Agricola
Right arrow Articles by Carlson, R. M.
Right arrow Articles by Buchanan, J. R.

Calcium-Magnesium-Potassium Equilibria in Some California Soils1

R. M. Carlson and J. R. Buchanan2

ABSTRACT

Ion exchange equilibria in several soils were studied to seek equilibrium equations that could be used in chromatographic models dealing with movement and distribution of fertilizer potassium in soil profiles. Soil samples were equilibrated with mixtures of CaCl2, MgCl2, and KCl solutions and then extracted with NH4OAc to determine exchangeable cation compositions at equilibrium. It was necessary to correct the exchangeable cation concentrations by subtracting the cations extracted from nonexchangeable sources by NH4OAc. Vanselow's, Davis', Gapon's, or Kerr's equations would not describe the equilibria. Empirical equations of the form:
Figure 1
did describe the equilibria with all three cations present, and over a wide range of composition, for all soils studied. In these equations Ai is the solution ion activity, k is the distribution coefficient, Ei is the equivalent fraction of the exchangeable cation, and Di and Pi are arbitrary constants that are characteristic for each soil and each cation.

NOTES

1 Contribution from Dep. of Pomology, Univ. of California, 95616. Presented before Div. S-2 of the Soil Science Society of America, Detroit, Michigan, Nov. 11, 1969. This work was supported in part by the California Prune Advisory Board.

2 Associate Pomologist and Specialist, respectively, Dep. of Pomology, Univ. of California, Davis, California 95616.

Received for publication November 13, 1972. Accepted for publication July 3, 1973.






HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
The SCI Journals Agronomy Journal Crop Science
Vadose Zone Journal Journal of Plant Registrations
Journal of Natural Resources
and Life Sciences Education		 Journal of
Environmental Quality
Copyright © 1973 by the Soil Science Society of America.