Soil pH is a measure of how acidic or alkaline soil is. It’s important for plant growth because it affects the availability of nutrients in the soil.
Soil pH scale
- pH 7: Neutral
- pH above 7: Alkaline
- pH below 7: Acidic
- pH 4.0–5.0: Strongly acidic
Most soils have pH values between 3.5 and 10. In higher rainfall areas the natural pH of soils typically ranges from 5 to 7, while in drier areas the range is 6.5 to 9. Soils can be classified according to their pH value: 6.5 to 7.5—neutral.