Soil reaction refers to the degree of soil acidity
or alkalinity. Soil reaction is very important because it affects nutrient
availability, microbial activity and plant growth.
Soil reaction is measured in units of pH,
which is approximately defined as
pH = -log [H+]
Most plant species perform best in the
ranges of pH 5.5 to 6.5 or 7.0 but some prefer extremes. For example azaleas
and blueberries grow best under more acidic pH conditions. In contrast alfalfa
does best under alkaline conditions.
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