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 Google Scholar Google Scholar Articles by Calvert, D. V. Articles by Seay, W. A. Search for Related Content PubMed Articles by Calvert, D. V. Articles by Seay, W. A. Agricola Articles by Calvert, D. V. Articles by Seay, W. A.

The Effect of Exchangeable Calcium on the Retention of Phosphorus by Clay Fractions of Soils of the Memphis Catena¹

ABSTRACT

The effect of Ca saturation on P-retaining properties of clay fractions of five Kentucky soils of the Memphis catena was studied. Changes in P retention and pH which occurred during storage of acid-washed clays were investigated. Retained P was considered to be that portion of added P removed by the clay separate from a water solution.

A definite change occurred in the P-retaining properties of initially acid-washed clay separates during storage as evidenced by the decrease in P and P³² remaining in solution and the increase in pH. This change was attributed to an increase in A1 saturation of the exchange complex.

With freshly acid-washed clay separates of all soils of the catena, P retention generally increased with increased Ca saturation, whereas P retention for clays aged after acid-washing generally decreased as Ca saturation increased.

It is suggested that in considering H, Ca and Al as exchangeable cations, P in solution decreases in the order given. Retention of added P by Memphis soil was about equal to the retention of added P by an aged Memphis clay separate.

Contribution from the Agronomy Department, University of Kentucky, Lexington. Published with the permission of the Director of the Kentucky Agr. Exp. Sta. Appreciation is expressed to the National Science Foundation and the Tennessee Valley Authority for partial support of this research.

² Formerly Graduate Assistant, Professor of Agronomy and Vice-Director of Kentucky Agr. Exp. Sta., respectively.

Received for publication July 20, 1959. Accepted for publication June 21, 1960.