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Published in Soil Sci Soc Am J 50:58-62 (1986)
© 1986 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Evaluation of Potassium Quantity-Intensity Relationships by a Computer Model Employing the Gapon Equation1

V. P. Evangelou and A. D. Karathanasis2

ABSTRACT

The influence of cation exchange selectivity coefficients on quantity-intensity (Q/I) relationships of soil systems was evaluated by the Gapon equation. Computer simulations of potassium Q/I plots revealed that the linear potential buffering capacity for K+ (PBCK), when exchangeable K+ constitutes a minor portion of the CEC, depends on the magnitude of the soil CEC and the Gapon exchange selectivity coefficient (KG). This dependency is valid only if the Q/I plot is directly K-(Ca + Mg) interaction dependent. Upon increasing the CEC and KG, PBCK increases since PBCK = CEC KG. At low KG values the CEC has a lesser influence on increasing the PBCK, and at low CEC values the KG has a smaller influence on the magnitude of the PBCK. The PBCK is also inversely related to soil K-loading but the influence of K-loading on the magnitude of PBCK, appears to be important only when exchangeable K+ represents a significant portion of the CEC. The influence of K-loading on the magnitude of PBCK, however, appears to be considerable only at K-loading values much higher from those encountered in most agricultural soils. These findings are supported by data available in the literature.

NOTES

1 Contribution from the Dep. of Agronomy, Univ. of Kentucky Agric. Exp. Stn., Lexington. The investigation reported in this paper (no. 85-3-51) is in connection with a project of the Kentucky Agric. Exp. Stn. and is published with the approval of the director.

2 Associate Professor and Assistant Professor, respectively. Dep. of Agronomy, Univ. of Kentucky, Lexington, KY 40546-0091.

Received for publication March 20, 1985. Accepted for publication July 19, 1985.






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The SCI Journals Agronomy Journal Crop Science
Journal of Natural Resources
and Life Sciences Education		 Vadose Zone Journal
Journal of Plant Registrations Journal of
Environmental Quality		 The Plant Genome
Copyright © 1986 by the Soil Science Society of America.