Plant Physiol. Drug Metab Dispos
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Plant Physiology 56:245-249 (1975)
© 1975 American Society of Plant Biologists

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Articles

Water Use Efficiency of Field-grown Maize during Moisture Stress 1

Thomas R. Sinclair, Gail E. Bingham2, Edgar R. Lemon and L. Hartwell Allen, Jr.3

a Microclimate Project, United States Department of Agriculture, Agricultural Research Service Northeastern Region, Cornell University, Ithaca, New York 14853

Theoretical analysis of the CO2 assimilation and water loss by single leaves suggests that the water use efficiency of C4 species decreases as stomatal resistance increases. To confirm this hypothesis for a complete maize crop, results from computer simulations and a field experiment were compiled for varying stomatal resistances. A soil-plant-atmosphere model allowed simulations of the many simultaneous interactions between a crop canopy and its environment. The simulations for varying stomatal resistances clearly indicated that as stomatal resistance increased, water use efficiency of the maize crop decreased. The field experiment data also confirmed that water use efficiency was significantly decreased under water stress conditions when stomatal resistance increased. We concluded that management practices for maize, which induce moisture stress conditions resulting in increased stomatal resistance, reduce both crop photosynthetic productivity and water use efficiency.

2 Present address: University of California, Lawrence Livermore Laboratory, Livermore, Calif. 94550.

3 Present address: United States Department of Agriculture, Agricultural Research Service Southern Region, University of Florida, Gainesville, Fla. 32604.

1 Contribution from the Agricultural Research Service, United States Department of Agriculture, in cooperation with the New York State Agricultural Experiment Station, Ithaca, N. Y., Department of Agronomy Series Paper No. 1075.






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Copyright © 1975 by the American Society of Plant Biologists