pH

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The measure of the acidity or alkalinity of soil. Descriptive terms commonly associated with certain ranges in pH are: extremely acid <4.5; very strongly acid 4.5-5.0; strongly acid 5.1-5.5; moderately acid 5.6-6.0; slightly 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; and very strongly alkaline >9.1. [Source: USDA National Plant Materials Manual]

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