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To test the effect of regulated deficit irrigation on the productivity of date palm cv Majhoul, an experiment was conducted for two consecutive years (March 2012-February 2014). During these times, seven water regimes were applied under drip irrigation: farmer regime (T0), 100% (T1), 80% (T2), 60% (T3), 80-100-60% (T4), 150% (T5) and 60-100-80% (T6) ETM. The measures focused on the monitoring of meteorological parameters, the water irrigation and the evolution of date yields of Majhoul variety. The results obtained show that: i. Water regime has significantly affected the average yields and water use efficiency, ii. Water irrigation needs are, on average, 51 m3/tree/year, and iii. Average date yields and water use efficiencies varied between 31 and 61 kg of dates/tree/year and between 0.44 and 1.36 kg of dates/m3.