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Soil Science Society of America Journal Abstract -

Cadmium Adsorption by Soils and Uptake by Plants as Affected by Soil Chemical Properties1

 

This article in SSSAJ

  1. Vol. 45 No. 4, p. 739-744
     
    Received: Sept 16, 1980
    Accepted: Mar 13, 1981


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doi:10.2136/sssaj1981.03615995004500040013x
  1. M. B. McBride,
  2. L. D. Tyler and
  3. D. A. Hovde2

Abstract

Abstract

The quantity of Cd2+ adsorbed by soils from the northeastern USA was measured at a given equilibrium concentration (10−5M) of the metal in soil solution. This “retention capacity” was strongly related by a linear function to the exchangeable Ca2+ content of the soils. In addition, Cd2+ uptake by corn plants grown in these soils amended with 1-µg Cd2+/g of soil was measured and found to be related to the retention capacity of the soil for Cd2+ by a curvilinear function. Although organic matter and clay in soil were able to limit Cd2+ uptake by the plants, the best soil indicators of Cd2+ availability were the retention capacity and exchangeable base (mainly Ca2+) content. The ability of exchangeable bases to account for most of the variability in Cd2+ adsorption by the soils as well as uptake by the plants is attributed to the important role of Cd2+-Ca2+ exchange reactions in the soil.

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