Denitrification and ammonification at low soil temperatures.    From Wordnik.com.  [Effects of changes in climate and UV radiation levels on function of arctic ecosystems in the short and long term] Reference

In ammonification the carbon is separated or divorced from the nitrogen and united with oxygen.    From Wordnik.com.  [The Story of the Soil; from the Basis of Absolute Science and Real Life,] Reference

They have power to convert organic nitrogen into ammonia nitrogen; that is, into the compound of nitrogen and hydrogen; and this step in the process is called ammonification.    From Wordnik.com.  [The Story of the Soil; from the Basis of Absolute Science and Real Life,] Reference

"Technically the last two steps in the process are nitrification proper; but, speaking generally, the term nitrification is used to include the three steps, or both ammonification and nitrification proper.    From Wordnik.com.  [The Story of the Soil; from the Basis of Absolute Science and Real Life,] Reference