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This research was conducted in AL-derkhabia in countryside rural Damascus by applying two agricultural seasons in the years 2021 and 2022. The Potato tubers was planted on 8 April (Summer season), to study the possibility of improving the water use efficiency of Potatoes crop (Everest variety) by Comparing the application of Alternating partial irrigation and Deficit irrigation. The experiment was designed by simple random design with nine treatments of different amounts of water during plant growth stages in three replications for each treatment on the level of confidence 95% .The treatments were as follows: Full irrigation treatment FI (control), Two alternating partial irrigation treatments: 80% and 70% of full irrigation for all growth stages (API80, API70), and two alternating partial irrigation treatments are 80% and 70% of the full irrigation for the tuber filling and maturity stages, API80TF and API70TF. And two Deficit irrigation treatments 80% and 70% of full irrigation for all growth stages (DI80, DI70). And two Deficit irrigation treatments are 80% and 70% of the full irrigation for the tuber filling and maturity stages, (DI80TF, DI70TF). The results showed that there were no significant differences in productivity between the treatment 100% of full irrigation and each of treatments of Alternating partial irrigation 80% and 70% of full irrigation for the two stages (tuber filling and maturity) and Deficit irrigation 80% and 70% of full irrigation for the two stages (tuber filling and maturity) and the values was (32.72, 30.56, 29.98, 30.86, 30.74 Ton.h-3 respectively) during the first season. And (41.25 39.32, 38.98, 40.22, 39.03Ton.h-3 respectively) during the second season. While the results showed that there were significant differences in productivity between the treatment 100% of full irrigation, and each of the treatments Alternating partial irrigation for all stages of growth (API80) and the treatment of Deficit irrigation for all stages of growth (API70), and Deficit irrigation for all stages of growth (DI80) and the treatment of Deficit irrigation for all stages of growth (DI70), with a percentage decrease of 47%, 56%, 38% and 47%, respectively during the first season, and 59%, 66%, 54% and 60%, respectively during the second season. The highest value of water use efficiency was recorded in Alternating partial irrigation treatment for the two stages (tuber filling and maturity) API70TF, with a value of 6.59Kg.m-3, and it was followed by the treatment Alternating partial irrigation for both stages (tuber filling and maturity) API80TF with a value of 6.34 Kg.m-3. And each of two treatments Alternating partial irrigation 80% and 70% of full irrigation for the two stages (tuber filling and maturity) achieved the highest values of tuber size with significant differences compared to the full irrigation treatment, with values (440, 418, 360 ml respectively) during the first season, and (305, 350, 356 ml respectively) during the second season. Through these results, it was found that the success of implementing partial alternating irrigation on the potato crop requires not apply it in the early stages of growth, and that the optimal period of apply it extends during the growth and filling of tubers until the end of the maturity stage. with confirmation on the importance of using one of the two methods of partial irrigation, alternating 80% of full irrigation for the two stages of tuber filling and maturity API80TF, and alternating partial irrigation 70% of full irrigation for the two stages of filling tubers and maturity API70TF, Because they have not caused any significant decrease in productivity, While achieving an advantage in terms of tuber size and protein percentage with significant differences with the other treatments, and with saving in water that can be used to irrigate additional areas.
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