NERP minimizes these N2O emission pathways by managing on-farm applied nitrogen sources through the implementation of the best management practices described by the 4R Plan. This 4R Plan is a risk-based approach, informed by over 40 years of peer-reviewed research on the effect specific management practices have on the biological processes that lead to nitrogen losses in North American cropping systems. The 4R Plan is designed to address the risk of nitrogen losses by promoting comprehensive nitrogen management across the 4Rs:
- Right Source - Slow / controlled release fertilizers or inhibitors
- Right Rate - Using annual soil testing and recommendations developed within the 4R Plan
- Right Time - Apply in spring, split application, or once soil has cooled to 10°C
- Right Placement - typically banded/ injected
The greater the NUE increase, the more offsets that are generated. Furthermore, NERP can be combined with other programs such as no-till to increase the amount of carbon offsets generated.