| Index | pH < 4.5 | 4.5 < pH < 5 | 5 < pH < 6.5 | 6.5 < pH < 7.5 | 7.5 < pH < 8.5 | >8.5 |
| Status of soil pH (H2O) | Strongly acidic | Medium acidic | Slightly acidic | neutral | Slightly alkaline | Strongly alkaline |