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:
“The civilized nations—Greece, Rome, England—have been sustained by the primitive forests which anciently rotted where they stand. They survive as long as the soil is not exhausted. Alas for human culture! little is to be expected of a nation, when the vegetable mould is exhausted, and it is compelled to make manure of the bones of its fathers. There the poet sustains himself merely by his own superfluous fat, and the philosopher comes down on his marrow-bones.”
—Henry David Thoreau (1817–1862)
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