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This article in SSSAJ

  1. Vol. 23 No. 3, p. 214-216
    Received: Aug 29, 1958
    Accepted: Nov 25, 1958

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Organic Matter Decomposition as Influenced by Oxygen Level and Method of Application to Soil1

  1. J. F. Parr and
  2. H. W. Reuszer2



Laboratory experiments were conducted to determine the rate of decomposition of straw added to soil as a localized placement or mixed thoroughly with the soil when aerated with N2-O2 gas mixtures containing 0, 2.5, 5.0 and 21% oxygen. Rates of decomposition and total decomposition were followed by determination of CO2 formed.

Early decomposition rates were somewhat lower with localized placement of the straw, but after 6 weeks of incubation there was little difference between the two methods of placement in total amount of straw decomposition.

Total decomposition after 6 weeks with 5.0, 2.5, and 0% oxygen in the aerating gas was equal to about 86, 70, and 13%, respectively, of that taking place when the aerating gas contained 21% oxygen. After 30 days of aeration at a 0% oxygen level, changing the aerating gas to a 21% oxygen level brought about a very rapid rise in the rate of decomposition.

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