The effect of nitrification on fixed 15N ammonium release in soil

Authors

  • David STOPAR University of Ljubljana, Biotechnical Faculty, Jamnikarjeva 101, SI-1111 Ljubljana, Slovenia
  • Ivan MAHNE University of Ljubljana, Biotechnical Faculty, Jamnikarjeva 101, SI-1111 Ljubljana, Slovenia
  • France MEGUŠAR University of Ljubljana, Biotechnical Faculty, Jamnikarjeva 101, SI-1111 Ljubljana, Slovenia

DOI:

https://doi.org/10.14720/aas.1999.73.1.15911

Abstract

Effect of nitrification on defixation of clay fixed ammonium was studied in soil with pronounced ammonium fixing capacity. Soil samples were amended with 15N labeled ammonium. Significant part of added ammonium (50–70 %) was not exchangeable with 2N KCl after the first 10 minutes of incubation. Dynamics of 15N in 2N KCl exchangeable mineral nitrogen was followed during 28 days of aerobic and anaerobic incubation. Exchangeable ammonium was microbialy converted to nitrite and nitrate during aerobic incubation. When the exchangeable ammonium pool was empty, a slow defixation of chemically fixed ammonium occurred. Approximately 20 % of additionally fixed ammonium was released in the second half of aerobic incubation. No defixation occurred during anaerobic incubation.

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Published

15. 03. 1999

Issue

Vol. 73 No. 1 (1999): PLANT PRODUCTION

Section

Original Scientific Article

License

Copyright (c) 1999 University of Ljubljana, Biotechnical Faculty

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

How to Cite

STOPAR, D., MAHNE, I., & MEGUŠAR, F. (1999). The effect of nitrification on fixed 15N ammonium release in soil. Acta Agriculturae Slovenica, 73(1), 9–14. https://doi.org/10.14720/aas.1999.73.1.15911
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