Organic Matter Decomposition as Influenced by Oxygen Level and Method of Application to Soil1
- J. F. Parr and
- 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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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