private farm in the El-Baharia Oasis area, Giza Governorate, Egypt, to study the effect of different irrigation systems (deep drip (DIS), micro jet (MIS), bubbler (BIS)) and applied irrigation water levels (IR: 100,85,70%) under mulched soil (MS) and un-mulched soil (UMS) and to determine the marketable yield (MY), crop quality parameters, actual evapotranspiration (ETa), water-use efficiency (WUE), irrigation water-use efficiency (IWUE), yield response factor (Ky) and actual crop coefficient (Kca) for date palm trees (Phoenix dactylifera L.). The experimental design was a split-split plot design with three replicates. The results showed that the MY and studied quality parameters (except the total soluble solid (TSS) content) of the date palm fruits were highest under the DIS, IR=100% and MS treatment for both seasons. For the 1 st and 2 nd seasons, the lowest seasonal ETa values were 564.41 and 526.78 mm, respectively under the DIS, IR=70% and MS treatment;the maximum date palm fruit WUE and IWUE were 3.22 and 1.55 kg m-3 and 3.61 and 1.62 kg m-3 , respectively under the DIS, IR=70% and MS treatment; the minimum Ky for date palm fruits was 0.16 and 0.12, respectively under the DIS, IR85% and MS treatment; and the minimum seasonal Kca values for the initial (I), development (D), mid-season (M), and late-season (L) growth stages were 0.29, 0.17, 0.28, 0.18 and 0.23 and 0.29, 0.15, 0.25, 0.14 and 0.21, respectively under the DIS, IR=70% and MS treatment. This study concluded that the cultivation of date palm trees under the DIS, IR=70% and MS treatment could save approximately 38% of the IR and increase the MY of date palm fruit by approximately 20 and 22% for the 1 st and 2 nd seasons, respectively, compared with the control treatment (BIS, IR=100% and UMS).