A field experiment was executed during the two successive seasons of 2004/2005 and 2005/2006 at Giza Agric. Res. Station to identify the most effective coefficient of daily pan evaporation accumulation selected from 1.25, 1.00and 0.75 EPC in scheduling the irrigation for wheat cultivar Giza 168 resaved 60, 75 and 90 kg N/fed in order to maximize crop and water productivity. The obtained results could be summarized as follows:-
1 The number of applied irrigations and water consumptive use (Cu) were increased as the value of EPC increased and, Cu differed significantly due to nitrogen level, with 90 kg N/fed consuming more water than the other N-levels.
2 The lowest Water Use Efficiency WUE was recorded under 1.25 EPC, comparable to the other tested EPC values and values of EPC differed due to nitrogen fertilizer levels and 90 kg N/fed recorded the lowest WUE while 75 kg N/fed obtained the highest value.
3 The plant height, grain weight/spike, grain weight/m2 and 1000-grain weight significantly influenced due to the adopted irrigation regimes and generally, tended to increase as the coefficient of pan evaporation was increased.
4 Grain and straw yield seemed to increase with increasing the value of EPC. The highest grain yield was obtained as irrigation was practiced according to 1.2 5 EPC and tended to reduce under the other assessed EPC treatments and this finding was true with straw yield in two seasons study.
5 All of agronomic yields and yield components were significantly increased as the nitrogen fertilizer levels increased, and 90 kg N/ fed treatment recorded maximum values than the other tested N-levels.
6- All of agronomic yields and yield components were positively increased as the adopted irrigation regimes interacted with the nitrogen fertilizer levels and the maximum value was recorded with combination of 1.25 EPC x 90-kg N/ fed.
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