The dynamic distribution characteristics of evapotranspiration(ET)of maize in the Hetao Irrigation District were clarified by using a large-scale weighing lysimeter, the correlations between ET and each influencing factor were explored with path analysis method. The results indicated that the cumulative ET of maize were 593.72 mm and 395.21 mm during the whole growth period in full and deficit irrigation treatments, respectively, and the corresponding average daily ET were 4.24 mm/d and 2.82 mm/d. Based on ET profiles in various growth stages, the ET was relatively minimal in sowing stage, just accounting for 3.7% and 5.8% of the whole growth period in full and deficit irrigation treatments. ET rose rapidly from jointing stage, and reached the maximum in tasseling stage with the total ET of 279.38 mm and 166.76 mm, accounting for 47.1% and 42.2% of the whole period in full and deficit irrigation treatments, respectively, and the average daily ET were 8.47 mm/d and 5.05 mm/d. For hourly ET profiles, a peak ET occurred at around noon but low ones were observed in the morning and evening. The path analysis showed that the decision coefficients of saturated water vapor pressure and average temperature were the largest, demonstrating two factors are the most important environmental driving factors for ET. Wind speed had the minimum effect on ET variation in two irrigation treatments, exhibiting an indirect effect on ET mainly. The main meteorological factors affecting ET of maize in Hetao Irrigated District were saturated vapor pressure and ambient temperature.
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