Field experiment was conducted at Tamia Agric., Res., Station, Fayoum, Egypt during 2008/2009 and 2009/2010 seasons to study the effect of N- fertilizer forms, i.e. F₁: organic form as chicken manure at the rate of 20m³fed^-1, F₂: bio-fertilizer (biogena)+37.5 kg mineral N as ammonium nitrate 33.0% N and F₃: mineral N fertilizer at the rate of 75 kg N fed^-1 (as ammonium nitrate 33.0% N) and scheduling irrigation treatments, i.e. I₁: irrigation at 0.8 cumulative pan evaporation (C.P.E.), I₂: irrigation at 1.0 and I₃: irrigation at 1.2 C.P.E.  on yield, yield components and some water relations of wheat crop (Giza 168 cv.). A split-plot design with four replicates was used since N- fertilizer forms were represented in the main plots while scheduling irrigation treatments were occupied the split ones. The main obtained results were as follows: 1- Using mineral N form and irrigation at 1.2 C.P.E. gave the highest averages of spike numbers m^-2, 1000-grain weight, grain yield fed^-1. (2149.28 and 2271.50 kg fed^-1) and straw yield (2619.60 and 2775.85 kg fed^-1) in the two successive seasons, but plant height was affected significantly in the second season only. The lowest averages of yield and its components were obtained from using organic fertilizer(chicken manure) form and irrigation at 0.8 C.P.E. in both seasons. 2- Seasonal consumptive use (ET_C) averaged 39.23 and 41.83 cm in 2008/2009 and 2009/2010 seasons, respectively. The highest ET_C values, i.e. 44.12 and 46.36 cm were recorded with the interaction (F₃I₃), whereas the lowest values as 35.65 and 38.72 cm resulted from the interaction (F₁I₁), in 2008/2009 and 2009 /2010, respectively, 3- Daily ET_C rates were low during Nov. and Dec., then increased during Jan. and Feb., to reach its maximum values during March and then declined again at April till harvesting. The values of daily ET_C decreased due to organic or bio-fertilizer forms in the two growing season's months. The crop coefficient (K_C) values (averages of the two seasons) were 0.53, 0.61, 0.70, 0.79, 0.93, 0.61 and 0.52 for, Nov., Dec., Jan., Feb., Mar., Apr. and May, respectively. 4- The highest water use efficiency, i.e. 1.27 and 1.29 kg grain m^-3 water consumed were obtained from the interaction of (F₃I₃) in 2008/2009 and 2009/2010 seasons, respectively.