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Division 2 The ammoniacal nitrogen (NH3-N) oxidation rate shall be measured by:

United Kingdom

Original text. Later amendments are not shown.

  1. (a)

    ammoniacal nitrogen (NH3-N) disappearance, or

  2. (b)

    the sum of nitrite nitrogen (NO2-) and nitrate nitrogen (NO3-) production with respect to time.

Compared to a control sample where the nitrification inhibitor has not been added, a soil sample containing the nitrification inhibitor shall show a 20 % reduction in ammoniacal nitrogen (NH3-N) oxidation rate based on an analysis carried out 14 days after application at the 95 % confidence level.