Classification of Soil PH Ranges
The United States Department of Agriculture Natural Resources Conservation Service, formerly Soil Conservation Service classifies soil pH ranges as follows:
| Denomination | pH range |
|---|---|
| Ultra acid | < 3.5 |
| Extreme acid | 3.5–4.4 |
| Very strong acid | 4.5–5.0 |
| Strong acid | 5.1–5.5 |
| Moderate acid | 5.6–6.0 |
| Slight acid | 6.1–6.5 |
| Neutral | 6.6–7.3 |
| Slightly alkaline | 7.4–7.8 |
| Moderately alkaline | 7.9–8.4 |
| Strongly alkaline | 8.5–9.0 |
| Very strongly alkaline | > 9.0 |
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—Henry David Thoreau (1817–1862)
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