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Nitrogen-15 Enrichment of Soils and Soil-Derived Nitrate¹

ABSTRACT

Nitrogen-isotope analysis of soils and soil-derived nitrate showed (i) that there is considerable variation in the ¹⁵N enrichment ( ¹⁵N) of the nitrate nitrogen produced on aerobic incubation of different soils and (ii) that the 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.

Key Words: nitrogen-isotope analysis • ¹⁵N variation • fertilizer-derived nitrate

¹ Journal Paper no. J-7314 of the Iowa Agr. & Home Econ. Exp. Sta., Ames. Projects 1835 and 1845. This work was supported in part by TVA.

² Professor and Assistant Professor, respectively, Department of Agronomy, Iowa State University, Ames, Iowa 50010.

Received for publication July 25, 1972.