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Published in Soil Sci Soc Am J 3:37-42 (1939)
© 1939 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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A Way of Sampling Soil Gases in Dense Subsoils, and some of Its Advantages and Limitations1

Damon Boynton and Walter Reuther2

ABSTRACT

Although it is being used successfully in light soils, the method described in this paper is particularly valuable for seasonal studies of the aeration of dense subsoils. Use of the sampling well makes it possible to obtain samples of gases when these subsoils are almost saturated with water and it is impossible to get samples by other methods. The fact that the sampling location remains the same eliminates soil heterogeneity as a possible reason for variations in analysis and increases the probable significance of small variations and minor trends.

On the basis of the data presented it is concluded that samples taken after evacuation of 150 cc. are representative of the zone in which the sampling well is located. Although there seems to be a maximum possible increase of two units in carbon dioxide percentage due to a tension of 20 cm. of mercury, field studies indicate that in many instances, perhaps most of the time, the increase in carbon dioxide percentage due to tension is negligible. While it is possible to keep the samples of gas for as long as three days in wet bottles, usually without serious changes in percentages, occasional changes of considerable magnitude point to the desireability of prompt analysis.

NOTES

1 Contribution from the Department of Pomology, New York State College of Agriculture, Ithaca, N. Y.

2 Assistant Professor and Assistant, respectively.






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Copyright © 1939 by the Soil Science Society of America.