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Abstract

 

This article in SSSAJ

  1. Vol. 46 No. 6, p. 1333-1336
     
    Received: Nov 14, 1980
    Accepted: Apr 19, 1982


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doi:10.2136/sssaj1982.03615995004600060042x

The Effect of Sodium Carbonates' Presence on the Soil Extract's Chemical Composition1

  1. Arie Nadler and
  2. Mordeckai Magaritz2

Abstract

Abstract

It is shown experimentally that some sodic soils contain difficult-to-detect Na carbonate minerals which affect the chemical compositions of their aqueous extracts. Upon extraction with water, a portion of the dissolved HCO-3 reacts with Ca2+ initially present in the soil (in a solid phase or occupying exchange sites) and is immediately precipitated as CaCO3. This phenomenon reduces extract pH and alkalinity (by precipitation of CaCO3 and release of CO2 gas) which obscures the initial presence of alkalinity.

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