- NitroEurope Integrated Projects, funded by the EU
- Nitrogen in Europe (NinE), a project funded by the European Science Foundation (ESF)
- International Nitrogen Initiative (INI)
- Alterra - Service contract 'Integrated measures in agriculture to reduce ammonia emissions'
- Research Coordination Network (RCN Denitrification), funded by U.S. National Science Foundation (NSF)
- Global Nutrient Export from Watersheds (Global NEWS), funded by Unesco-IOC