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This study evaluates the Hargreaves (HARG) equation for estimation of monthly ET 0 under the semiarid conditions of the middle Ebro River Valley (NE Spain). First, the Hargreaves equation was compared against measured lysimeter ET 0 values at Zaragoza for the period May 1997-October 2000. The average of estimated values was only 5.6% above the average of measured values. Later, the...