الفهرس 
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Abstract
Two field experiments were carried out at a private farm in Sharkia Governorate, Egypt, during 2017/2018 and 2018/2019 seasons to study the effect of bio and mineral nitrogen fertilization on yield and its components of some sugar beet cultivars. Each field experiment was carried out in split split-plot design with four replicates. The main-plots were occupied with cultivars (Hossam, Asus poly and Glorious). The sub-plots were allocated with biofertilization treatments i.e. treated Phosphorin, Cerealine and Potassiumag (450 g/fed of each) and control treatment. The sub sub-plots were devoted with nitrogen levels (70, 90 and 110 kg N/fed). The results showed that Hossam cultivar significantly surpassed other studied cultivars in root fresh weight/plant, root/top ratio, root length and diameter, root and sugar yields/fed at harvest. However, Asus poly cultivar registered the highest values of foliage fresh weight/plant and top yield/fed. Treated soil with Cerealine produced the highest values of all studied yield and its components. Fertilizing with 110 kg N/fed resulted in the highest values of yield and its components, followed by 90 kg/fed and lastly 70 kg N/fed. It can be concluded that mineral fertilizing Hossam cultivar plants with 110 kg N/fed and treating soil with Cerealine at the rate of 450 g/fed before first irrigation directly to achieve highest productivity and root quality of sugar beet. While, in order to maintain high productivity and root quality of sugar beet at the same time reduce production costs and environmental pollution, it can be recommended that mineral fertilizing Hossam cultivar plants with 90 kg N/fed and treating soil with Cerealine under the environmental conditions of Bani-Hassan Village, Awlad-Saqr Center, Sharkia Governorate, Egypt.