This is a review of the Canadian science and technology related to sources,
impacts and abatement for atmospheric nitrogen emissions from agriculture.
The primary focus is on the gases ammonia (NH3) and nitrogen oxides (NOx).
In Canada, recent inventories show a significant increase in agricultural
emissions of NH3. Most emissions are from farm animals, with the remainder
from fertilizer application. Current estimates indicate that farm vehicles
contribute approximately 5% of total NOx emissions in Canada. Fertilized fa
rmland is also a source of NOx. Techniques that are available to Canadian p
roducers to reduce on-farm nitrogen air emissions include: feeding strategi
es, manure management and housing for livestock, air purification, and synt
hetic nutrient management. Improved efficiency of fuel combustion in farm v
ehicles reduces NOx emissions. At the present time, relative to significant
Canadian studies on agricultural sources of nitrogen air emissions, there
is little research into the associated environmental effects and on abateme
nt techniques. There is a need for further investigation into all aspects o
f atmospheric nitrogen emissions in Canadian agriculture.