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Evapotranspiration of Cotton and Estimation Methods¹

Average measured E_T curves and E_T/R_S curves were developed for estimating short-period (7 to 14 days) or seasonal E_T for cotton grown under wet, moderate, and dry soil moisture regimes on a medium- and a fine-textured soil in the Lower Rio Grande Valley of Texas. Maximum average E_T rates ranged from 0.46 cm per day for the dry moisture regime to 0.74 cm per day on the wet moisture regime on the medium-textured soil compared with 0.46 to 0.76 cm per day on the dry and wet moisture regimes, respectively, on the fine-textured soil.

Comparison of the two estimating methods indicated that cotton E_T estimates made from average E_T were as reliable as estimates made from E_T/R_S and solar radiation.

Key Words: irrigation regime • stage of plant growth • soil texture

² Research Soil Scientist, USDA; Associate Professor, Texas Agricultural Experiment Station; and Agricultural Research Technician, USDA; respectively, Weslaco, Texas.

Received for publication February 2, 1967.