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 |
Read more about this topic: Soil PH
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