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This article in SSSAJ

  1. Vol. 53 No. 1, p. 296-297
     
    Received: May 16, 1988


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doi:10.2136/sssaj1989.03615995005300010054x

A Method to Determine Soil-Entrapped Denitrification Products in Submerged Soils

  1. J. C. Katyal,
  2. L. S. Holt  and
  3. A. M. Gadalla
  1. Indian Council of Agric. Res. (ICAR), New Delhi, India
    Agro-Economic Division, Int. Fertilizer Development Ctr. (IFDC), P.O. Box 2040, Muscle Shoals, AL 35662
    Soils and Water Dep., Atomic Energy Authority, P.O. Box 13 759, Cairo, Egypt

Abstract

Abstract

To measure the contribution of soil-entrapped gases to denitrification in submerged soils, a soil-filled cylindrical bag (7 cm in height by 5-cm diam) made from stiff polyester cloth net was positioned in the center of potted Crowley silt loam soil. Denitrification of 15N-labeled KNO3 (14.85 atom % excess, applied at 100 kg N ha−1) was complete in 16 d after fertilization; 71% of the KNO3 was denitrified, mainly as N2 gas, with 41% trapped in the soil and 30% present in the headspace. Although no significant change in denitrification occurred during the subsequent 8 d, 15N recovery from soil-entrapped gases declined (from 41.2 to 28.4%), whereas that from gases present in headspace increased (from 29.6 to 43.9%). Regardless of time of sampling, around 90% of the 15N was recovered. These results demonstrate that in situ placement of soil-filled polyester cloth net bags before fertilization is a practical approach for sampling submerged soils to assess the contribution of soil-entrapped gases to denitrification loss.

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