A field experiment was conducted on sand soil to evaluate the impact of interaction between nitrogen sources, rates water regime on micronutrients uptake by potato crop. Potato plants were fertilized with urea and ammonium phosphate applied at rates of 150, and 90 kg ha^-1 of both two different N forms in addition to unfertilized treatment. These two rates were splitted into two equal doses; first one was applied at 20 days after seedling initiation and the second at 25 days from the first dose. Plants were grown under two water regimes, i.e. 100% and 60% Etc. Fe, Mn, Cu and Zn were frequently affected by water regimes. Except Cu, other elements were significantly accumulated in tubers under 60% evapotranspiration (Etc) regimes higher than 100% Etc regime.  Fe, Mn in tubers was higher in case of urea than ammonium phosphate at rate of 150 kg N ha^-1 as compared to 90 kg N ha^-1. Cu values in tubers did not significantly affected by water regimes and N rates but urea form still superior over ammonium phosphate. On the other hand, Zn was more accumulated in tubers of plants fertilized ammonium phosphate applied at 90 kg N ha^-1 under 60% Etc water regime comparing to other treatments. Transfer of Fe from soil to potato tubers seems to be very low. Mn was moderately transferred from soil to potato tubers. Copper was moderately to high transferred from soil to plant tubers as affected by tested factors. Potato tubers act as accumulator for Zn since TF was high and nearly to 1. Ammonium phosphate enhanced the transfer of Zn comparing to urea fertilizer. It increases with application of 90 kg N ha^-1 as compared to 150 kg N ha^-1. There was no significant difference between 100% and 60% Etc water regimes.