Two field experiments were conducted at Shandaweel Agricultural Research
Station, during 2002/03 and 2003/04 seasons. Three irrigation regime treatments, i.e ,
0.8, 1.0 and 1.2 evaporation pan coefficients with four bread wheat cultivars, Sakha
93, Giza 168, Gemmeiza 7 and Gemmeiza 9 to find out the specific pan-coefficient
needed for scheduling irrigation of wheat using class A pan evaporaticn records
under different wheat cultivars at Upper Egypt region. The results revealed significant differences among studied cultivars and
irrigation treatments in all studied traits in the second season. The irrigation
treatment at 1.2 evaporation pan coefficient gave the best results with Gammeiza 7
regarding to vegetative growth traits, grain yield and its components. The irrigation at
1.2 evaporation pan coefficient with Gammeiza7 cultivar produced the highest grain
yield (26.66 and 26.10 Ardab/fed) for the first and second seasons, respectively. The irrigation treatment at 1.2 evaporation pan coefficient recoded the
highest amount of water consumed more than the other two treatments. Water
consumptive uses by wheat were 1582.4, 1796.9 and 2215.9 m³/fed, for irrigation
treatments at 0.8, 1.0 and 1.2 evaporation pan coefficients, respectively. The
irrigation at 0.8 evaporation pan coefficient gave the highest value of water use
efficiency. From these results, it could be concluded that the application of irrigation
water at 1.2 evaporation pan coefficient could be recommended with wheat cultivar
Gammeiza7 for high production under Upper Egypt conditions.