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This article in SSSAJ

  1. Vol. 50 No. 6, p. 1489-1493
    Received: Nov 4, 1985

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A Closed, Well-oxygenated System for the Determination of the Emission of Carbon Dioxide, Nitrous Oxide, and Ammonia1

  1. P. Fine,
  2. A. Feigin and
  3. Y. Waisel2



A simple closed system was set up for the measurement of CO2, N2O, and NH3 emission from soil samples kept under well-oxygenated atmosphere. The system is an adaptation of a method suggested by Cornfield (1961a). Carbon dioxide is precipitated from the atmosphere as BaCO3, while O2 is generated from a BaO2 solution in equivalent amounts. With the aid of the proposed method, the simultaneous and quantitative determination of the mineral N forms in soils, of the gaseous N forms, and of CO2 may be performed even in well-oxygenated conditions. Tests carried out in incubated soilsludge mixtures indicated that gaseous N forms may constitute a large fraction of the organic N ammonified. This may result in an underestimation of the mineralization potential of the organic N. Gas measurement may be needed where losses of N gases are likely or for the testing of the suitability of incubation techniques for the assessment of N mineralization capacities. The method is especially useful for the study of C and N dynamics in soil-sludge mixtures.

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