About Us | Help Videos | Contact Us | Subscriptions
 

Abstract

 

This article in SSSAJ

  1. Vol. 36 No. 1, p. 174-175
     
    Received: July 23, 1971
    Accepted: Sept 22, 1971


 View
 Download
 Alerts
 Permissions
Request Permissions
 Share

doi:10.2136/sssaj1972.03615995003600010056x

Fractionation of Cation Exchange Capacity for Assessing Soil and Water Sodicity1

  1. C. A. Bower and
  2. J. D. Rhoades2

Abstract

Abstract

High vermiculite, arid zone soils whose cation exchange capacities (CEC) decrease more than 45% by K fixation have higher than usual regression coefficients for the relation between their exchangeable-sodium ratio (ESR) and sodium-adsorption ration (SAR). The regression coefficients are approximated by the equation: regression coefficient of ESR/SAR relation = (0.00043 × percentage decrease in CEC upon K fixation ) - 0.0045. For eight soils having a wide range of vermiculite contents, the exchangeable-sodium percentage required to cause a 25% reduction in hydraulic conductivity at a salt concentration of about 10 meq/liter was highly correlated (r = 0.95) with CEC after K fixation.

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

Copyright © .