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This article in AJ

  1. Vol. 61 No. 2, p. 302-305
    Received: Aug 24, 1968

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

  1. J. W. Cary and
  2. H. D. Fisher2



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.

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