The major goal was to study the response of five multigerm sugar beet varieties namely; Oscar poly, Desprez poly N, Pleno, Nejma and H poly to three nitrogen fertilizer levels, i.e., 100, 120 and 140 kg N/fed.The obtained results revealed that Desprez poly N variety significantly increased in growth traits, i.e., root diameter, root fresh weight and sugar yield/fed, while Nejma variety significantly surpassed in sucrose% and root yield/fed, and reduction in impurities% in both seasons.Application of 140 kg N/fed. maximized yield productivity, represanted by improved average root weight, root and sugar yields/fed. However, juice impurities were increased as nitrogen level was increased from 100 to 140 kg/fed. On the contrary, a gradual reduction in sucrose% has been detected with the increase in nitrogen level over 120 kg/fed.The interaction between Desprez poly N variety and nitrogen fertilization up to 140 kg N/fed. recorded the highest values in root and sugar yields/fed. Under the conditions of this study productivity of sugar beet varieties could be maximize by supply sufficient nitrogen fertilization levels from 120 to 140 kg N/fed.
Key words: Sugar beet genotypes, Different nitrogen levels and In newly reclaimed soils INTRODUCTIONSugar beet ranks the second sugar crop after sugar cane crop over all the world where it provides about 40% of the world sugar production. All sugar beet genotypes cultivated in Egypt are imported from foreign countries, so, it is preferable to evaluate them under Egyptian conditions especially under newly reclaimed soil to select the best suited ones. The varital differences in gen make up expression may be throw some light on their relative importance and behavior through the growing season. Osman et al (2003) showed that sugar beet Kawemira cultivar was superior in sucrose%, root, top and sugar yields/fed compared to cultivars Top, Lola, and Pleno. Aly ( 2006), Azzazy et. al. (2007) and El-Sheikh et. al. ( 2009) found significant differences among sugar beet varieties varied significantly for root fresh weight/plant, root and sugar yields/fed, while root length and diameter as well as sucrose and purity% did not differ significantly. Sugar beet variety KWS-9422 gave the highest root and sugar yields/fed. Enan et. al. (2009) revealed that sugar beet varieties differed significantly in all studied traits in both seasons. Sugar yield in the 1 st season, Farida variety gave a significant increase for sugar yield, juice quality, sucrose and purity% while it recorded the lowest values of impurities (Na, K and N%). Abd El-Aal et. al. (2010) detected significant variation in yield productivity and root quality among the varieties. Kawemira and Gloria varieties gave the