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This article in SSSAJ

  1. Vol. 29 No. 5, p. 631-633
    Received: Feb 23, 1965



Recording CO2 in Soil-Root Systems with a Potentiometric Membrane Electrode1

  1. C. R. Jensen,
  2. S. D. Van Gundy and
  3. L. H. Stolzy
  1. University of California, Riverside



A commercial electrode was evaluated for measuring the partial pressure of CO2 in soil. Carbon dioxide was monitored in containers of Yolo silt loam, with and without a growing tomato plant (Lycopersicum esculentum), and compared with gas chromatograph measurements of simultaneous soil air samples. A linear correlation coefficient of 0.98 between the two methods was obtained, although the electrode departs slightly from linearity below 2% CO2. Small increases of CO2 pressure in the soil were observed immediately following small additions of water; these increases could be followed continuously by the electrode. The CO2 electrode should prove practical for both greenhouse and field measurements.

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