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This article in SSSAJ

  1. Vol. 22 No. 1, p. 36-37
    Received: June 14, 1957
    Accepted: Aug 6, 1957

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Carbon Dioxide from Plant Roots as a Factor in the Replacement of Adsorbed Sodium in Calcareous Soils1

  1. J. O. Goertzen and
  2. C. A. Bower2



The effects of CO2 from plant roots in facilitating the dissolution of CaCO3 and the reclamation of sodic soils was studied by comparing the HCO3- concentrations of leachates and the less of adsorbed Na from pots of cropped and uncropped soils receiving uniform leaching with salt-free water. It was found that the effect of CO2 on the replacement of adsorbed Na was measureable but small, and of less importance than the effect brought about by the hydrolysis of CaCO3 upon leaching. Data were obtained which indicate that alfalfa roots release more CO2 than Rhodesgrass roots, and that more of the CO2 is retained in the soil at high moisture levels than at low moisture levels.

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