Recording CO2 in Soil-Root Systems with a Potentiometric Membrane Electrode1
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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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