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Soil Perfusion under Controlled Conditions of Soil Moisture Content and Soil Atmospheric Composition¹

ABSTRACT

A new soil perfusion system is described which allows the continuous recycling of an aqueous solution through a soil column under controlled environmental conditions. The system consists essentially of a perforated inner column for soil, jacketed by an outer column in which constant air pressure is maintained. Precise control of soil moisture content and soil atmospheric composition during perfusion is accomplished by regulation of pressure and composition of gases surrounding the soil column.

¹ Contribution from Battelle Memorial Inst., Pacific Northwest Laboratories, Richland, Wash.; the Dept. of Water Sciences & Engineering, University of California, Davis; and the Dept. of Soil Science, University of Wisconsin, Madison. The investigation was supported by US AEC Contract AT(45-1)-1830 at Battelle Memorial Institute and by PHS research grant WP 00751 at the University of Wisconsin.

² Senior Research Scientist, Battelle Memorial Institute; Associate Professor of Water Science; Professor of Soil Science.

Received for publication May 2, 1969. Accepted for publication June 4, 1969.