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Plant Moisture Stress: A Portable Freezing-Point Meter Compared with the Psychrometer¹

A small portable instrument for measuring the freezing-point depression of plant tissue has been developed for field use. The instrument is easy to operate and can be constructed from materials costing less than $100.

Moisture stress measurements made with the freezing-point meter on a variety of plants were compared with vapor pressure psychrometer measurements. Variation between duplicates in the freezing point averaged 1.2 bars, but differences between stress measurements made with the psychrometer and freezing-point instrument averaged 2.6 bars.

Key Words: Freezing-point depression • Diffusion pressure deficit • Plant water relations

² Research Soil Scientist and Mathematician, respectively, Snake River Conservation Research Center, Kimberly, Idaho 83341.

Received for publication August 24, 1968.