| Soil-test rating | Soil Attributes | |
| OM (%) | N-NO3 (ppm) | |
| Very Low | <0.5 | 0 - 10 |
| Low | 0.6 - 1.5 | 10 - 20 |
| Medium | 1.6 - 3.5 | 20 - 40 |
| High | 3.6 - 6.0 | 40 - 60 |
| Very High | >6.0 | >60 |