Additional Metric Notes

Rationale: This metric is frequently used, scalable, and linked to nitrogen (N) and phosphorus (P) concentrations in receiving water bodies. Reporting total N and P as part of the calculations is important to prevent changes in efficiency from masking increases in overall inputs. Nutrient Use Efficiency (NUE) and Phosphorus Use Efficiency (PUE) can be used to indicate nutrient loss at the edge of the field or nutrient surplus (1 – NUE or PUE). Note that N and P fertilizers are included in the SBTN High Impact Commodity List (HICL). Key resources: 4R nutrient management; FAO cropland nutrient balance Additional/complementary metrics: Application rate & removal rate Landscape deep dives: Upper Midwest, USA - corn (+ soy rotation) - Key indicator for this biome where water pollution from excess nutrients is high Key resources: USDA Agricultural Chemical Use Program: https://www.nass.usda.gov/Surveys/Guide_to_NASS_Surveys/Chemical_Use/