a7b8739a_Soil_Management__Availability_for_plant_uptake
[Form of Nitrogen] Ammonia [Formula] NH3 [Availability for plant uptake] 
Ammonia is a gas. Ammonium can escape from the surface of the soil under certain conditions and is harmful to plants in high quantities. Ammonium is the basic building block of commercial nitrogen fertilizers.
Soil Management
Availability for plant uptake