| Proposed P source factors | Proposed P loss category | Proposed loss rating value |
| Dissolved P | 0.01207 e0.00925 × Soil test P (mg·P·kg−1) | |
| Particulate P | 5.5 × erosion (t·ha−1·yr−1) | |
| P application | kg P2O5 applied ha−1·yr−1 | |
| Application method | Buried (depth > 200 mm) in furrows | 0.2 |
| Buried (depth < 200 mm) in furrows | 0.4 | |
| Surface application with cane trash | 0.6 | |
| Surface application on bare soil | 1.0 | |
| Application timing | September to December | 0.2 |
| April to August | 0.3 | |
| January to March | 0.5 |