Only when nitrogen is converted from dinitrogen gas into ammonia (NH 3) does it become available to primary producers, such as plants. In addition to N 2 and NH 3, nitrogen exists in many ...

Ammonia, NH 3, is an alkaline gas and so turns damp red litmus paper blue. Ammonium ions (NH 4 +) – found in ammonium compounds such as ammonium chloride, ammonium nitrate and ammonium sulfate ...