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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Famous quotes containing the word soil:
“Our own country furnishes antiquities as ancient and durable, and as useful, as any; rocks at least as well covered with lichens, and a soil which, if it is virgin, is but virgin mould, the very dust of nature. What if we cannot read Rome or Greece, Etruria or Carthage, or Egypt or Babylon, on these; are our cliffs bare?”
—Henry David Thoreau (1817–1862)
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