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This article in JEQ

  1. Vol. 2 No. 3, p. 363-365
    Received: July 25, 1972

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Nitrogen-15 Enrichment of Soils and Soil-Derived Nitrate1

  1. J. M. Bremner and
  2. M. A. Tabatabai2



Nitrogen-isotope analysis of soils and soil-derived nitrate showed (i) that there is considerable variation in the 15N enrichment (Δ 15N) of the nitrate nitrogen produced on aerobic incubation of different soils and (ii) that the Δ 15N of this nitrate nitrogen depends upon the time of incubation and can differ markedly from that of the total soil N. The data reported illustrate the impracticability of a recently proposed method of assessing the contribution of fertilizers to nitrate in surface waters that requires measurement of the natural 15N enrichment of soil- and fertilizer-derived nitrate.

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