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Measurement of Water Stress in Cotton Plant Leaf Discs With a Thermocouple Psychrometer¹

Synopsis: Peltier psychrometer has been calibrated to measure water activities equivalent to diffusion pressure deficits (DPD's) of 20 to 65 bars suction at 25° C. Cotton leaf discs studied had DPS's from 40 to 65 bars and relative water contents from 94 to 52%, respectively.

² Research Soil Scientist, Southern Plains Branch, Soil and Water Conservation Research Division, ARS, USDA, U. S. Big Spring Field Station, Big Spring, Texas.

Received for publication December 15, 1964.