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Simple Diffusion Well for Measuring Soil Specific Diffusion Impedance and Soil Air Composition¹

ABSTRACT

Straight, cylindrical tubes, open at the lower end and inserted into the soil can serve a dual purpose. Measurement of the re-entrance of oxygen into the tubes after they have been flushed with nitrogen permits a calculation of the specific diffusion impedance of the soil. Charts for computing purposes are given. Measurement of the composition of the gas in the well, after a suitably long equilibration time, is a convenient means for measuring the composition of the soil air at the depth of insertion of the well.

The physical and mathematical aspects of the method are briefly presented and experimental proof is offered for the formulas that are derived.

¹ Contribution of the Agronomy Department, N. C. Agr. Exp. Sta. Published with approval of the Director of Research as Journal Paper No. 442.

² Associate Professor of Soils.

Received for publication October 12, 1953.