About Us | Help Videos | Contact Us | Subscriptions
 

Abstract

 

This article in SSSAJ

  1. Vol. 18 No. 2, p. 143-147
     
    Received: Nov 28, 1953
    Published: Apr, 1954


 View
 Download
 Alerts
 Permissions
 Share

doi:10.2136/sssaj1954.03615995001800020008x

Cationic Activities as Indexes for Characterizing Five Arkansas Soils Occurring in the Southern Region1

  1. E. O. McLean and
  2. F. E. Baker2

Abstract

Abstract

Five soils and 3 extracted colloidal materials were characterized by means of the clay membrane electrode technique for measuring ionic interactions. The study dealt with Lakeland loamy fine sand, Ruston sandy loam, Crowley silt loam, Houston clay, Sharkey clay soils and the <.2 µ clay, the <25 µ clay, and the crude humic acid fractions extracted from the Sharkey clay soil.

The characteristic curves resulting from the plotting of the fractions of K active at various K-Ca saturations of the soils and extracted materials were prepared. Comparison of these curves with those of the individual clay minerals made possible the characterization of the soils and the extracts with respect to which clay minerals appeared to predominate in them.

The results indicate that kaolinite clay dominates the regulation of cationic interactions in the Lakeland, Ruston,a nd Crowley soils. Beidellite appears to predominate in the Houston and Sharkey soils. Montmorillonite seems to play the major role in the < 25 µ clay from the Sharkey, but the beidellite evidently masks the effect of the montmorillonite in the < .2 µ clay and in the whole soil. The crude humic acid from the Sharkey gave no evidence of any appreciable effect upon the cationic interactions of the whole soil.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © . Soil Science Society of America