My Account: Log In | Join | Renew
Search
Author
Title
Vol.
Issue
Year
1st Page

Abstract

 

This article in SSSAJ

  1. Vol. 49 No. 5, p. 1105-1109
     
    Received: July 23, 1984
    Published: Sept, 1985


 View
 Download
 Alerts
 Permissions
 Share

doi:10.2136/sssaj1985.03615995004900050006x

Potassium Fixation Characteristics of Five Southern California Soils1

  1. A. Shaviv,
  2. M. Mohsin,
  3. P. F. Pratt and
  4. S. V. Mattigod2

Abstract

Abstract

Potassium fixation in five southern California soils, sampled at 15-cm depth increments down to a depth of 105 cm, is reported. The objective was to develop quantitative relationships between K fixation and other soil and solution properties. The experiments were conducted under wet conditions only and the exchangeable cation removal done by BaCl2. Potassium fixation, Kf, was calculated by the difference between total initial K and total final exchangeable plus soluble K in a given system and compared to ΔCEC, the decreases in the initial cation exchange capacity (CECin). The difference between Kf and ΔCEC appeared small, inferring that under wet field conditions, fixation mainly occurred via the mechanism of K entrapment between clay plates. Linear increases of Kf with EP (the ratio of adsorbed K to adsorbed Ca and Mg) and with PAR = {(K+)/[(Ca2+)+(Mg2+)]1/2} were found for each depth for each soil. Potassium fixation also increased with increasing depth. Relating the fractional fixation FKf = (Kf/CECin) to EP and PAR, a more general representation of K fixation was obtained. Fractional fixation and EP showed a linear relationship as FKf = A2 + B2 × EP. Such a correlation resulted in one or two regression lines representative of fixation through a given soil profile to the 105-cm depth.

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

Copyright © . Soil Science Society of America