الفهرس 
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Abstract
Three field experiments were conducted in 2000/2001, 2001/2002 and 2002/2003 seasons at the Experimental Station, Faculty of Agriculture, Mansoura University to study the effect of planting dates, biofertilization treatments and NK combination levels on growth, yield components, quality and yield characters of sugar beet (Beta vulgaris var. altissima, L.) cv. Beta Poly 4. The main findings of this investigation could be abstracted as follows:1 Planting dates showed significant effect on most growth attributes after 120 and 150 days from planting, yield components and quality determinations as well as yield traits in the three seasons of this study. Generally, The optimum planting date that yielded the highest values of previous characters was planting sugar beet on 1st Oct., excluding few status over all seasons of this research.2 Biofertilization treatments caused a significant effect on root and foliage fresh and dry weight, LAI at 120 and 150 days from sowing (in the three seasons), CGR (in the first season), RGR and NAR (in the second and third seasons), root and foliage fresh weight as well as root length and diameter (in the three seasons), TSS % (in the second season), sucrose % (in the three seasons), purity % (in the third season), root, top and sugar yields/fad (in the three seasons). Rhizobacterin treatment produced the highest values of most studied characteristics in the three seasons. Concerning application of the mixture of Rhizobacterin + Cerialine and Cerialine biofertilizer, its ranked after Rhizobacterin treatment, respectively with respecting their effect these traits in the three season. On the other hand, chick treatment (without biofertilization) resulted in the lowest means ones.3 Significant differences in all growth attributes, yield components, quality and yield characters under study were noticed due to NK combination levels in all growing seasons. Application of 80 kg N + 48 kg K2O/fad resulted in the highest values of growth attributes, yield and yield components in all seasons. In addition, application of 60 kg N + 48 kg K2O/fad produced the best results after formerly combination level, moreover it gave the highest values of root and foliage dry weight at 120 and 150 days from sowing (in the second and third seasons), LAI at 120 and 150 days from sowing (in the first season),CGR, RGR (in the second and third seasons) and sugar yield (in the three seasons). While, The highest values of TSS % were obtained by application of 60 kg N + 24 kg K2O/fad (in the first season) or 60 kg N + 48 kg K2O/fad (in the second and third seasons). However, the highest means of sucrose % and apparent purity % were resulted from application of 20 kg N + 48 kg K2O/fad in the three growing seasons, except purity % in the first season only. Generally, it could be concluded that in order to maximize sugar beet productivity under the environmental condition of Dakhlia district, planting sugar beet on 1st Oct. and application of Rhizobacterin as biofertilizer and 80 or 60 kg N + 48 kg K2O/fad.