Table S1.
Emissions inventory derived from GREET
| Process | GHG intensity |
| kg CO2e/kg N | |
| Nitrogen fertilizer production* | 4.41 |
| On-field N2O emissions | 9.38 |
| kg CO2e/acre | |
| Phosphoric acid production | 33.6 |
| Potassium oxide production | 15.3 |
| Calcium carbonite production | 2.5 |
| Herbicide production | 22.1 |
| Insecticide production | 0.2 |
| Diesel fuel production | 12.8 |
| Diesel fuel combustion | 76.7 |
| Natural gas production | 2.6 |
| Natural gas combustion | 13.9 |
| Liquid petroleum gas production | 4.4 |
| Liquid petroleum gas combustion | 18.0 |
| Gasoline blendstock production | 4.9 |
| Gasoline blendstock combustion | 16.7 |
| Electricity for irrigation† | 49.1 |
*
Emission rate varies by county based on mix of nitrogen fertilizers.
†
Emissions per acre vary by county based on the quantity of irrigated water use.