Greenhouse gas emissions from biogas production from manure in Norwegian agriculture

Manure management in Norway is a source of emissions to air of greenhouse gases (GHGs), specifically methane (CH4) and nitrous oxide (N2O), in addition to other nitrogen species such as ammonia (NH3), nitric oxide (NO) and nitrogen (in the form of N2). The volume of emissions of these GHGs and nitrogen species will depend on a number of factors such as type of animal, carbon and nitrogen content in fodder, manure management system, climate, time of spreading of manure and cultivation practices. All of these parameters need to be taken into consideration when building a model to calculate emissions of methane, nitrous oxide ammonia and potentially other nitrogen species.