Preventing rainwater entry by using plastic mulch simulated arid conditions. Water tables were maintained at 40 or 80 cm below the soil surface. At harvest, soil solution salinity (ECw) in the lysimeters ranged from 3.5 to 7.6 dS/m. Water table depths or subirrigation water salinity levels had no significant effect on the total tuber weight of either cultivar. However, yield of grade A Russet Burbank tubers was greater when the water table was maintained at 40 cm. This trend was similar but not significant for Atlantic tubers. Productivity of Atlantic was lower than that of Russet Burbank. Subirrigation with brackish water in the saline soil resulted in yield that was 59% above the global average, thus demonstrating its utility for agriculture in dry regions.