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A Statistical Comparison of pH Values of some English Soils after Measurement in both Water and 0.01M Calcium Chloride¹

ABSTRACT

Published pH values of British soils, determined both by equilibration with water and 0.01M CaCl₂ 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 CaCl₂ solution.

¹ Received Dec. 16, 1970. Approved Mar. 5, 1971.

² Visiting Associate Professor of Geography, University of Cincinnati, Ohio, 45221; permanent address, Department of Geography, University College of Wales, Aberystwyth, Cardiganshire, Great Britain.