STUDIES on the relationships among evapotranspiration (ET), grain yield, dry biomass, and leaf area index (LAI) of rice were conducted in lysimeters and in the field. Two methods of planting rice were used: transplanting and direct seeding. There were twelve planting combinations involving spring, summer, and fall crops. Three equations involving linear leaf measurements and stem length were developed to estimate the LAI. Peak ET rates occurred during the reproductive stage and coincided well with the maximum LAI value. Two equations involving dry biomass and grain yield in relation to ET were also developed. The relationship between dry biomas (DB) and ET was found to be: DB = 4715.2 + 303.1 ET. Grain yield (rough rice at 12% moisture, GY) was related to ET as: GY = 3995.8 + 174.9 ET. With an average rice yield in the Everglades of Florida, the total ET requirement would be about 54 cm.
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Shih et al. (1983) studied this question.