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Abstract

 

This article in SSSAJ

  1. Vol. 35 No. 6, p. 922-926
     
    Received: Apr 13, 1971


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doi:10.2136/sssaj1971.03615995003500060023x

Losses of Nitrogen from Some Flooded Soils in Tracer Experiments1

  1. F. E. Broadbent and
  2. M. E. Tusneem2

Abstract

Abstract

Nitrogen losses were measured in laboratory and greenhouse experiments in four flooded soils after addition of 15N-tagged (NH4)2SO4 or rice straw after various incubation periods. Substantial losses occurred in all cases except where NH4+-N was rapidly immobilized and/or fixed by clay minerals. The necessity for nitrification as a prelude to N loss was demonstrated by showing that no loss occurred when oxygen was excluded and that where no nitrate was produced, no N2 was evolved. Growing rice plants (Oryza sativa) effectively reduced the magnitude of the nitrogen loss.

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