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Integrated Stomatal Opening as an Indicator of Water Stress in Zea¹

A technique based on mass flow porometry is described which allows continuous monitoring of stomatal aperture in the field. The relationship between the integral of the light intensity for a 24-h period (ILI) and the integral of the stomatal opening (ISO) of well exposed leaves for the same period provides a very sensitive indicator of the onset of stress. Experimental data from 2 years of operation in the field showed good year to year agreement between the maximum ISO values attainable at any ILI.

Key Words: Stomata • Stress • Zea mays • Irrigation Scheduling

² Plant physiologists, USDA-ARS, Crops Res. Lab., and agricultural engineer, USDA-ARS, Agric Engineering Res. Ctr., Colorado State Univ., Fort Collins, CO 80523.

Received for publication March 31, 1983.