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Temperature-Time Curves as Soil Freezes Related to Moisture-Stress Curves¹

ABSTRACT

The rate of cooling of a moist soil sample during freezing is determined by the rate of heat dissipation to the surroundings and the rate of ice formation with the sample. Assuming equilibrium conditions at an instantaneous temperature, the amount of ice formed between two temperatures depends upon the amount of water held in the sample between the soil moisture stresses associated with the two temperatures.

Temperature-time curves (freezing curves) during freezing have been obtained for soils using a thermistor and recording potentiometer. The curves have been related to moisture-stress curves derived through the use of standard pressure apparatus. A method is presented which may allow the construction of a moisture-stress curve from one freezing of a single sample of soil.

¹ Technical Paper No. 1098, Oregon Agr. Exp. Sta. Research done under regional project W-29. Presented before Div. I, Soil Science Society of America, Nov. 15, 1956, at Cincinnati, Ohio.

² Associate Soil Scientist, Graduate student in Mathematics, and Graduate Research Assistant, respectively. The latter is now an Instructor at Southern Missionary College, Collegedale, Tennessee.

Received for publication December 30, 1957. Accepted for publication April 17, 1958.