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ABSTRACT
Eighty soils collected more or less at random over a large area gave very low correlations between soil pH and percent base saturation. In the same area, soils chosen according to soil-forming factor ordinations gave very high correlations between the two soil properties. Climate was the dominant determining factor.
1 Contribution from the Departments of Soils and Plant Nutrition, Univ. of Calif., Davis and Berkeley. Support for the study was received from the California Cooperative Soil-Vegetation Project and the National Science Foundation. Part of a thesis submitted by the senior author in partial fulfillment of the requirements for the M.S. degree.
2 Graduate Student, Univ. of Calif., Davis; and Professor Emeritus, Univ. of Calif., Berkeley 94720, respectively.
Received for publication April 13, 1971. Accepted for publication July 21, 1971.
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