Release, movement and recovery of 3,4-dimethylpyrazole phosphate (DMPP), ammonium, and nitrate from stabilized nitrogen fertilizer granules in a silty clay soil under laboratory conditions

  • Azam F
  • Benckiser G
  • Müller C
 et al. 
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Abstract

In model experiments under laboratory conditions the release of 3,4-dimethylpyrazole phosphate (DMPP; ENTEC), NH 4 + -N, and NO 3 - -N from the ENTEC-fertilizer granules placed on a silty clay soil was studied. The air-dried soil contained in Petri dishes was moistened to 18% or 24% water holding capacity, and incubated for 10 days at 4°C, 15°C or 25°C after placing the granules in the centre of the plates. Plates without granules served as controls. At appropriate intervals, soil cores were taken at 5-20 and 25-40 mm distance from the granules and analysed for DMPP, NH 4 + -N and NO 3 - -N. Amongst the three fertilizer ingredients, NO 3 - was found to be the most mobile showing a fairly uniform distribution in both soil zones during 10 days of incubation. Under the different temperature and moisture conditions, more than 80% of DMPP remained within the 0- to 5-mm region around the granule. Between 5% and 15% of DMPP was found in the 5- to 20-mm region, and

Author-supplied keywords

  • 3,4-Dimethylpyrazole phosphate
  • Denitrification
  • Diffusion
  • Nitrification
  • Nitrification inhibitors

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Authors

  • F. Azam

  • G. Benckiser

  • C. Müller

  • J. C.G. Ottow

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