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Relationship of Exchangeable Na Percentage at Different Soil pH Levels to Hydraulic Conductivity¹

ABSTRACT

The relation of exchangeable Na percentage at different soil pH levels to the hydraulic conductivity of 6 soils with exchange capacities varying from 7.5 to 50.8 me. per 100 g. was studied. The same quantities of Na reduced hydraulic conductivity more in acid than in neutral or alkaline soils. This response was studied further by correlating hydraulic conductivity with Na percentage calculated relative to each of three quantities: (1) the cation-exchange capacity (CEC) at pH 7, (2) the CEC at the pH of the soil sample, and (3) the sum of exchangeable Ca, Mg, K, and Na. Highly significant correlation coefficients relating hydraulic conductivity to Na percentage were obtained for all six soils when Na was expressed as a percentage of Ca + Mg + K + Na. Calculation of the Na percentage on the basis of the CEC at the pH of the soil and at pH 7 gave highly significant correlation coefficients in 4 and 2 soils, respectively.

¹ Paper No. 1532, University of California Citrus Research Center, Riverside. The authors wish to acknowledge the laboratory assistance of Francis L. Bair, J. O. Ervin, R. A. Shepard, and J. F. Warneke.

² Professor of Soil Science, Professor of Soil Physics, and Associate Professor of Soil Science, University of California, Riverside.

Received for publication February 24, 1964. Accepted for publication April 17, 1964.