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Reference evapotranspiration (ET0) affected by many uncertain complicated atmospheric variables is an important parameter of hydrological models of water balance study. Base on daily meteorological data from 1955 to 2006 in Gaoyou irrigation district, FAO56 Penman-Menteith method was used to calculate daily reference evapotranspiration. Through Kendall rank correlation test, the calculated ET0 has...
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