Encyclopedia of Soil Science

2008 Edition
| Editors: Ward Chesworth

Reaction

Reference work entry
DOI: https://doi.org/10.1007/978-1-4020-3995-9_475

Operationally the soil reaction is the pH of a soil, used as an indication of the relative acidity or alkalinity. The following (arbitrary) designated pH ranges are used: extremely acid (<4.5), very strongly acid (4.5–5), strongly acid (5.1–5.5), moderately acid (5.6–6), weakly acid (6.1–6.5), neutral (6.6–7.3), weakly alkaline (7.4–7.8), moderately alkaline (7.9–8.4), strongly alkaline (8.5–9), very strongly alkaline (>9.1). The term soil reaction is falling out of use.

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© Springer 2008