Fertilizer research

, Volume 37, Issue 2, pp 85–92 | Cite as

Ammonia volatilization from urea and ammoniacal fertilizers surface applied to winter wheat and grassland

  • S. G. Sommer
  • C. Jensen


Ammonia volatilization from urea, diammonium phosphate, ammonium sulphate and calcium ammonium nitrate surface applied to winter wheat and grassland was determined with windtunnels. The fertilizers were applied at a rate of 8–12 g N m−2 to plots on a non-calcareous sandy loam. Five experiments were carried out during March to June 1992, each experiment including 2 to 4 treatments with two or three replications. The daily ammonia loss rate was measured during 15 to 20 days. Cumulated daily loss of ammonia from urea followed a sigmoidal expression, while the cumulated ammonia loss from diammonium phosphate showed a logarithmic relationship with time from application. For ammonium sulphate and calcium ammonium nitrate no significant loss could be determined, because daily loss of ammonia were at the detection limit of the wind tunnels. Mean cumulated ammonia loss from plots receiving urea, diammonium phosphate, ammonium sulphate and calcium ammonium nitrate were 25%, 14%, <5% and <2%, respectively, during a 15–20 day measuring period.

Key words

Ammonia volatilization ammoniacal fertilizers urea wind tunnel 


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Copyright information

© Kluwer Academic Publishers 1994

Authors and Affiliations

  • S. G. Sommer
    • 1
    • 3
  • C. Jensen
    • 2
    • 3
  1. 1.Department of Plant Nutrition and Physiology, Research Centre for AgricultureResearch Centre FoulumTjeleDenmark
  2. 2.Department of Land DataVejleDenmark
  3. 3.Danish Institute for Plant and Soil ScienceTjeleDenmark

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