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The effect of soil CO 2  on the development of vegetable crops is not well-understood. An inexpensive and simple method for monitoring soil CO 2  levels is needed to study those effects. A soil gas extraction apparatus was constructed from polyvinyl chloride (PVC) pipe, tygon tubing, and Plexiglas. The apparatus was placed into soil covered with black plastic or spray-on mulch or left bare. Gas samples were collected twice weekly after canopy closure of eggplant  (Solanum melongena  L., cv Black Bell) and continued through the last harvest. A vacuum pump was used to pull gas samples from 16 inches (41 cm) below the soil surface for collection in an airtight foil bag. The CO 2  levels, recorded over time and between treatments, was determined with detector tubes available commercially and compared to gas chromatography results. Detector tube CO 2  levels were comparable to the samples from the same bags measured by gas chromatography. This system was able to monitor differences in soil CO 2  levels between treatments and over time.

An Apparatus to Monitor Soil CO2