pH

"A simple classification of pH is as follow :

Extremely acid< 4.5
Very strongly acid4.5 - 5.0
Strongly acid5.0 - 5.5
Moderately acid5.5 - 6.0
Slightly acid6.0 - 6.5
Neutral6.5 - 7.3
Stlightly alkaline7.3 - 7.8
Moderately alkaline7.8 - 8.5
Strongly alkaline8.5 - 9.0
Very Strongly alkaline> 9.0 "

Source: E.A. Fitzpatrick, An Introduction to Soil Science, page 109.

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