Two field experiments were conducted in two successive seasons of 2015/2016 and 2016/2017 at the Research Farm Al-Kawthar, Faculty of Agriculture, Sohag University, to determine the effect of two planting dates (15 November and10 December) and three nitrogen fertilizer levels (50, 75 and 100 kg N/fed.) on yield and its components of four bread wheat genotypes (Sids 12, Giza 168, ... إقراء المزيد