Published pH values of British soils, determined both by equilibration with water and 0.01 M CaCl 2 solution have been analyzed by statistical techniques. Values from the two determinations are linearly related with a highly significant positive correlation. A pH of 6.5 is conveniently regarded as neutrality when soil reaction is determined with CaCl 2 solution.
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Brian E. Davies (1971) studied this question.
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