Effect of ammonium fixation and displacement on the added nitrogen interaction in incubation experiments

F. Azam, F. W. Simmons, R. L. Mulvaney

Research output: Contribution to journalArticlepeer-review

Abstract

A laboratory incubation experiment was conducted to study the effect of NH4+fixation/defixation on the added N interaction (ANI) in three Illinois Mollisols fertilized with 100 or 200 mg N kg-1 soil. A positive ANI was observed in all three soils, which was greater at the higher rate of applied N. However, very little exchange was observed between applied 15NH4+and the native clay-fixed NH4+, and the ANI observed were attributed largely to microbial immobilization-mineralization. The results suggested that variations in the NH4+fixation capacity of soils will not have a significant bearing on the interpretation of data obtained from studies of the ANI.

Original languageEnglish (US)
Pages (from-to)99-102
Number of pages4
JournalBiology and Fertility of Soils
Volume18
Issue number2
DOIs
StatePublished - Jul 1994

Keywords

  • Added N interaction
  • Ammonium fixation
  • N immobilization
  • N mineralization
  • Priming effect

ASJC Scopus subject areas

  • Microbiology
  • Agronomy and Crop Science
  • Soil Science

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