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Soil Aeration as Affected by Organic Matter Application¹

ABSTRACT

The effect of the method of incorporation of organic matter under various conditions of soil moisture and soil compaction on the composition of soil air was the object of this research. Application of fresh chopped alfalfa resulted in a pronounced depression of the oxygen content of the soil air. The order of decreasing oxygen content for the different methods of application was: check > surface mixed > layer at 2-inch depth > surface application. High moisture content and compaction of the soil increased the time during which the oxygen content remained below 15% at 8-inch depth. Both the oxygen and the carbon dioxide contents were determined at the 1-, 3-, and 8-inch levels, as well as the amount of carbon dioxide given off at the soil surface.

¹ Contribution from Purdue University Agr. Exp. Sta. Journal Paper No. 1100. Presented before Div. I, Soil Science Society of America, Nov. 14, 1956 at Cincinnati, Ohio.

² Former Research Fellow, Purdue University, presently with the U.S.D.A., A.R.S., S.W.C.R.D., University of Maine, Orono, Me.; and Soil Scientist, Purdue University, respectively.

Received for publication April 25, 1957. Accepted for publication July 2, 1957.