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This article in SSSAJ

  1. Vol. 54 No. 1, p. 167-172
     
    Received: Sept 7, 1988
    Published: Jan, 1990


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doi:10.2136/sssaj1990.03615995005400010026x

Soil-Atmosphere Access Chamber and Analytical Assembly to Monitor Soil Aeration

  1. S. Mukhtar ,
  2. J. L. Baker and
  3. R. S. Kanwar
  1. Agricultural Engineering Department, Iowa State University, Ames. 50011

Abstract

Abstract

A reliable method for soil-aeration monitoring is needed. This study was conducted to develop and test a sampling and analysis technique to be used in rapid and nondisruptive monitoring of soil atmospheres. A specially constructed soil-atmosphere access chamber and a dual-action syringe sampling assembly were used to obtain atmosphere samples at various depths within the soil profile in laboratory columns and field plots. The O2 contents of these samples were measured by using a portable O2 meter, a probe, and a custom-made sample analysis reservoir. For comparison, an existing method was used to obtain simultaneous O2-concentration measurements. Laboratory testing proved the new sampling technique to be fast and free of outside contamination. Use of the dual-action syringe sampling assembly helped obtain representative samples at a given depth both in the field and in the laboratory. Identical O2 concentrations measured using the new technique and the previously available method suggested that this new soil-atmosphere sampling and analysis technique is reliable. Very small standard deviations among repeated measurements of O2 concentrations at various sampling depths in both laboratory columns and field plots suggest small variations in the soil atmosphere samples obtained by using this access chamber and the analytical assembly.

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