الفهرس 
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Abstract
Four experiments (two field experiments and two laboratory experiments were carried out in Tag AlEzz Agric., Research station farm and Mansoura seed Technology unit). During 2002/2003 and 2003/2004 seasons to study the effect of four harvest dates and six nitrogen treatments as well as there interaction on growth measurements, yield and yield components and technological characters of wheat (Triticum, aestivum, L.) Giza 168. 1 field experiments: Two field experiments were carried out in Tag ALEZZ Agricultural Research station farm, Dakhia Governorate, during the two winter seasons of 2002/2003and 2003/2004. These studies were aimed to determine the effect of harvest dates, nitrogen treatments, as well as their interactions on growth yield and yield components of wheat CV. Giza168. A split plot design with four replicates was used in this study. The main plots were allocated to four harvest dates as follows: 1 17 days after heading. 2 27days after heading. 3 37 days after heading. 4 47 days after heading. The subplots were occupied by six nitrogen treatments as follows: 1 Without fertilization (control). 2 160kg Urea (soil application). 3 80 kg Urea (soil application) + 5% foliar applications. 4 80kg Urea (soil application) + 10% foliar applications. 5 40kg Urea (soil application) + 5% foliar applications. 6 40kg Urea (soil application) + 10% foliar applications. Nitrogen fertilizer in the form of Urea (46.5%N) was applied in three equal portions at the first watering. Each sub plot was 7.0m length and 3.0m width occupying an area of 2132 in both seasons wheat was proceeded by rice (Oryza sative.L). Conclusion: from previous results, it can be concluded that application of 80kg urea applied through soil in addition to 10% urea through foliage and harvesting wheat plants at 37 or 47 DAH to produce the highest quality and the best germination as well as the highest grain yield of wheat cv. Giza 168 under, Dkahlia Governorate.