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Comparison of Various Methods of Sampling Soil Water for Determining Ionic Salts, Sodium, and Calcium Content in Soil Columns¹

ABSTRACT

At the end of a column experiment studying the flux of ionic salts and Na⁺ from applied sewage effluent, the salt, Na⁺, and Ca²⁺ contents were compared in extracts from porous cups, from the soils around the cups, and saturated paste extracts after the column soils were air-dried. The salt level in the porous cup samples and in the moist soil samples obtained directly at the end of the experiment, and the Na⁺ content in the porous cup and in saturated paste extracts that were equilibrated for 48 hours were highly correlated.

¹ Contribution from the Department of Agronomy, Colorado State University Exp. Stn., Fort Collins, CO 80523, and published as Scientific Series Paper no. 2411.

² Graduate Teaching Assistant, Professor of Agronomy, and Professor of Agronomy and Soil Scientist, USDA, SEA-AR, respectively.

Received for publication December 11, 1978. Accepted for publication May 4, 1979.