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This article in SSSAJ

  1. Vol. 50 No. 1, p. 260-263
    Received: Feb 19, 1985
    Accepted: Aug 21, 1985

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Introduction of Acetylene Into Soil for Measurement of Denitrification1

  1. P. K. McConnaughey and
  2. J. M. Duxbury2



Gaseous N loss via denitrification can be measured with static flux chambers when acetylene (C2H2) is used to block nitrous oxide (N2) reduction. This paper describes a method for the introduction of C2H2 at low concentrations into the soil by diffusion. The method utilizes an above-ground manifold connected to diffusion tubes inserted in the soil and C2H2 flows through the manifold at a rate of 0.33 mL s−1. Acetylene levels in the soil atmosphere within the flux chamber site ranged from 0.16 to 2.07 mol m−3, and the apparatus did not alter CO2 fluxes as measured by a static chamber method.

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