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What is soil pH? All soils can be classified as acid, neutral, or alkaline. The degree of acidity or alkalinity of a soil can be described by a pH value. pH values range from 0 to 14. Any value below 7.0 is considered acid, a value of 7.0 is neutral, and a pH above 7 is alkaline. Thus, a soil with a pH of 5.8 is acidic, whereas a soil with a pH of 7.9 is alkaline.
The soil pH is a measure of the acidity or alkalinity in soils. pH is defined as the negative logarithm (base 10) of the activity of hydronium ions (H+ or, more precisely, H 3O+ aq) in a solution. In water, it normally ranges from -1 to 14, with 7 being neutral.A pH below 7 is acidic and above 7 is alkaline.Soil pH is considered a master variable in soils as it controls many chemical processes that take place. It specifically affects plant nutrient availability by controlling the chemical forms of the nutrient.cidity in soils comes from H + and Al3+ ions in the soil solution and sorbed to soil surfaces. While pH is the measure of H + in solution, Al 3+ is important in acid soils because between pH 4 and 6, Al 3+ reacts with water (H 2 O) forming AlOH 2+ , and Al(OH) 2 + , releasing extra H + ions.