1 Department of Agroecology - Agrohydrology and Water Quality, Department of Agroecology, Science and Technology, Aarhus University2 Department of Agroecology, Science and Technology, Aarhus University3 Department of Agroecology - Soil Fertility, Department of Agroecology, Science and Technology, Aarhus University4 Department of Agroecology - Soil Fertility, Department of Agroecology, Science and Technology, Aarhus University
One of the tools for evaluating the results of environmental action plans or EU directives related to nutrients in the agricultural sector is to follow the development of annually estimated nitrogen (N) and phosphorus (P) balances and surplus. Unlike greenhouse gas and ammonia emissions, countries are not required to report N and P balances for agriculture as part of any international conventions. As a consequence, there is no organisation equivalent to the Intergovernmental Panel on Climate Change (IPCC) or United Nations Economic Commission for Europe (UNECE) who has responsibility for standardising and improving the methodology to calculate such balances. However, Eurostat and OECD have jointly established a standard for using a gross N balances, and the soil N balance calculated by the CAPRI model has gained acceptance in European policymaking. It can be mentioned that the Task Force on Reactive Nitrogen (TFRN), established under Convention on Long-Range Transboundary Pollution (CLRTP), is currently establishing national N balances that include agriculture.