Field experiment was carried out at Demo farm of Faculty ofAgriculture, Fayoum University, Egypt during 2012/2013 and 2013/2014seasons to study the effect of ammonia gas rates, i.e., F1: 80 and F2: 100 kgN fed-1 (1 kg ammonia gas contain 82.4 % N) and irrigation regime i.e., I1:irrigation at 40%, I2: 60% and I3: 80% from available soil moisturedepletion (ASMD), at sandy and calcareous soils, on yield, yieldcomponents and some water relations of wheat crop (Giza 168). A split plotdesign with four replications was used in both seasons. The obtained resultsshowed that using 100 kg N fed-1 at 40% ASMD gave the highest averagesof plant height, spike number m-2, 1000-garin weight, spike weight m-2,straw yield fed-1 (2011.4 and 2334.1 kg fed-1) in sandy soils (Site 1), and(2539.5 and 2716.7 kg N fed-1) in calcareous soils (Site 2), and grain yieldfed-1 (1888.4 and 2077.4 kg fed-1) in Site 1 and (2209.4 and 2468 kg fed-1)in Site 2, in the two successive seasons, respectively. The lowest averages ofyield and its components were obtained from applying 80 kg N fed-1andirrigation at 80 % ASMD, at the two sites in both seasons. Seasonalconsumptive use (ETC) averages were 44.47 and 43.95 cm in 1st season and45.53 and 45.17 cm in 2nd season, in both sites, respectively. The highestETC values were recorded with the interaction (F2I1), whereas, the lowestvalues resulted from the interaction (F1I3) in all sites and seasons. Daily ETCrates were low during November and December, then increased duringJanuary and February, to reach its maximum values during March and thendeclined again at April till harvesting. The values of daily ETC decreaseddue to decreasing ammonia gas rate in the two growing season's months.The crop coefficient (KC) values (averages of the two seasons) were 0.47,0.54, 0.66, 0.70, 0.87, 0.67 and 0.47 in the Site 1 and 0.47, 0.55, 0.63, 0.67,0.86, 0.67 and 0.49 in the Site 2, for, Nov., Dec., Jan., Feb., Mar., Apr. andMay, respectively. The highest water use efficiency, i.e., 0.96 and 1.04 kggrains m-3 water consumed at the Site 1, and 1.14 and 1.24 kg grains m-3water consumed at the Site 2, were obtained from (F2I1) treatments in firstand second seasons, respectively.