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Published in Soil Sci Soc Am J 56:733-736 (1992)
© 1992 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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In Situ Measurement of the Effective Transport Volume for Solute Moving Through Soil

B. E. Clothier*

Environmental Physics Section, Dep. of Scientific and Industrial Research (DSIR), Private Bag, Palmerston North, New Zealand

M. B. Kirkham

Evapotranspiration Lab., Dep. of Agronomy, Kansas State Univ., Manhattan, KS 66506-3801

J. E. McLean

Utah Water Research Lab., Utah State Univ., Logan, UT 84322-8200

* Corresponding author.

ABSTRACT

A simple field method for measuring the soil's effectively mobile water fraction during near-saturated flow is presented. Initial charging of the immobile fraction {theta}im is achieved by first wetting the soil with a disk permeameter until steady conditions prevail. The disk is then removed and rapidly replaced, but now filled with a tracer solution. Subsequently after a period of infiltration with tracer (0.1 M KBr), the soil underneath is sampled. The ratio of the measured to applied concentration, c*/cm, in the samples will be the fraction of the soil's water that is effectively mobile. We assume that the antecedent tracer concentration is zero, and that the mobile fraction, {theta}m, is at concentration cm. Disk permeameters, set at the slightly unsaturated potential head {psi}o = –20 mm, wetted Manawatu fine sandy loam to a water content of {theta}o = 0.414 m3 m–3. From analysis of the tracer concentrations measured under the disk, we deduced {theta}m to be just 0.203. This semimobility was in accord with the observed depthwise penetration of tracer, as well as other measures of mobility previously found by others from longer term leaching studies carried out nearby.

NOTES

Contribution from DSIR, Kansas State Univ., and Utah State Univ.

Received for publication July 8, 1991.


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