: With the rise in the cost of producing crops, the increase in fuel price and high soil, and water salinity, all these factors resulted to loose in yield and less benefit cost of the potato crop. To implement this purpose, the following procedures were carried out; the effect of using magnetized irrigation water (MIW) under a center pivot irrigation system on potatoes through a management irrigation system to reduce the quantity of the used irrigation water, and reduce the effect of soil salinity on potato yield. To achieve the main objective of this study, three experimental factors were studied. The first factor is irrigation water (treated and non-treated by magnetized irrigation water), the second factor is crop evapotranspiration level (four levels of evapotranspiration 110, 100, 90, and 80%), the third factor is soil salinity (two levels of soil salinity low 1.46 and high 4.56 dS/m), with potato seeds Santana cultivar. Three measurements before and after planting were conducted; water and soil chemicals analysis, foliage of plants (leaf area index), tubers yield (Mg/ha.), and tuber diameters of the new yield. Compared between MIW and N-MIW under center pivot irrigation system on potato. the reported results showed that, decrease in soil salinity between 10 and 17%, and a decrease in soil pH between 3.4 and 5.7%. Increase in leaf area index of plants during growing of plants between 13.5 and 11.5 %. Increase production in yield by about 11.5 and 22.5%, increase in seed diameters of new tubers (10-20%), and decrease 10% from the use of irrigation water.