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Published in Soil Sci Soc Am J 45:316-321 (1981)
© 1981 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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The Isotope Composition of Residual Fertilizer Nitrogen in Soil Columns1

R. E. Karamanos and D. A. Rennie2

ABSTRACT

A growth chamber experiment was carried out in which soil coumns that had received none or 200 kg N/ha were subjected to two differing water regimes. The {delta}a 15N (per mill 15N excess) of the NO3-N present in the leachate of all treatments decreased initially, with maximum depletion occurring between 4 and 6 weeks. In general, during the 14- to 16-week period, large increases in the {delta}a 15N of the leachate occurred. The magnitude of the decreases and subsequent increases were least for the drier water regimes receiving no fertilizer N ({delta}a 15N ranging from –2 to +7) and greatest for the high water fertilized treatment ({delta}a 15N ranging from –12 to +40). This very extensive fractionation was attributed to the preferential nitrification of 14NH4+.

Isotope balance calculations based on the isotope dilution principle are included to illustrate the serious errors that can be made in estimating the fertilizer N content of selected N compartments if the NO3--N is leached before the NH4+ oxidation is completed.

NOTES

1 Publication no. R254 of the Saskatchewan Institute of Pedology, Saskatoon, Saskatchewan, Canada. This study is part of a FAO/IAEA (Vienna) coordinated research program and was supported by the National Research Council of Canada.

2 Professional Research Associate and Professor, respectively, Dep. of Soil Science, Univ. of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 0W0.

Received for publication May 5, 1980. Accepted for publication October 27, 1980.






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