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Abstract

 

This article in SSSAJ

  1. Vol. 44 No. 4, p. 741-744
     
    Received: Nov 13, 1979
    Accepted: Apr 3, 1980


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doi:10.2136/sssaj1980.03615995004400040016x

Factors Influencing Oxygen Consumption Rates in Flooded Soils1

  1. K. R. Reddy2,
  2. P. S. C. Rao3 and
  3. W. H. Patrick4

Abstract

Abstract

Thirty-seven surface soil samples varying in physico-chemical properties were incubated under reduced (anaerobic) conditions to study the factors influencing oxygen consumption rates. Oxygen consumption rates were measured after introduction of a known amount of oxygen into a reduced (anaerobic) soil system and following the disappearance of oxygen as a function of time.

The time dependence of oxygen consumption in all flooded soils could be described as a two-phase first order reaction process. Rapid oxygen consumption during Phase I was followed by relatively slower consumption during Phase II. The first-order rate coefficient (k1, hour−1) for Phase I was approximately the same for all 37 soils evaluated, whereas each soil was characterized by a different rate coefficient (k11, hour−1) for Phase II. The average value for k1 was 0.15 hour−1 (coefficient of variation = 20%) while the values of k11 ranged from 0.0027 to 0.054 hour−1. Step-wise regression analysis of the data showed that NaOAc-extractable Fe of a reduced soil was the single best predictor of k11 and also the fractional consumption associated with Phase I. Significant improvement in these regressions was obtained when total NH4-N content of the reduced soil, in addition to reducible Fe2+ was considered.

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