Table 3.
Factors used in estimating soil N2O emissions
| Factors and reference | Value | Source | ||
|---|---|---|---|---|
| Direct N2O emission factor for N additions from synthetic fertilizers, organic amendments, and crop residues and N from SOM mineralization (kg N2O–N (kg N)−1) | Synthetic fertilizer | EF1 | 0.016 | Table 11.1 (IPCC 2019) |
| Other N input | 0.006 | |||
| For flooded rice fields (kg N2O–N (kg N) −1) | Single and multiple drainage | 0.005 | ||
| Indirect N2O emission factor for N volatilization and redepositing (kg N2O–N (kg NH3–N + NOX–N volatilized) −1) | EF2 | 0.014 | Table 11.3 (IPCC 2019) | |
| Indirect N2O emission factor for leaching/runoff (kg N2O–N (kg N leaching/runoff) −1) | EF3 | 0.011 | ||
| Fraction for volatilization from synthetic fertilizer ((kg NH3–N + NOx–N) (kg N applied) −1) | FracVOL | 0.15 | ||
| Fraction for volatilization from all organic N fertilizers applied ((kg NH3–N + NOx–N) (kg N applied or deposited)–1) | 0.21 | |||
| Fraction for N losses by leaching/runoff in wet climates ((kg N (kg N addition) −1) | FracLEACH | 0.24 | ||