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Field Measured and Simulated Corn Leaf Water Potential¹

ABSTRACT

The dynamic nature and magnitude of field-measured leaf water potential for sweet corn (Zea mays L.) was compared with that predicted by the model TROIKA. Some plant parameters for corn were estimated from the literature and field observation, whereas the moisture desorption curve and the hydraulic conductivity-water content relationship were determined for the Varina sandy loam. Leaf water potential-relative water content relationships were determined in the greenhouse. Hourly microclimate data were used as input to the model, and the predicted and observed values of leaf water potential were compared for 3 days during the growing season. Generally, the model predicted leaf water potential with reasonable accuracy throughout the day. Water potential gradients in the soil were small as compared with those across the root and across the stomatal opening.

¹ Contribution from the Coastal Plains Soil & Water Conserv. Res. Center, Southem Region, USDA-ARS, Florence, SC 29502, in cooperation with the South Carolina Agric. Exp. Stn., Clemson, SC.

² Soil Scientist, USDA-ARS, Morris, Minn., formerly Florence, S.C.; and Professor, Dep. of Agric. Eng., Clemson Univ., Clemson, S.C., respectively.

Received for publication August 29, 1977. Accepted for publication November 10, 1977.