The present investigation was carried out during the growth season of 2011-2012 at Nobaria Sugar and Refining Company, El-Bohera Governorate to evaluate the influence of N- fertilization on yield and quality of sugar beet grown in calcareous soil. Split plot design with 3 replicates with 8 treatments, four rates of nitrogen fertilizer were spread in the main plot, while the sub plots were assigned for the two organic fertilizers. The result obtained showed significant increase in shoot fresh weight, root fresh weight, root length, root yield and sugar yield in plants with increasing fertilization up to 350 kg N/fed. Organic fertilization by farmyard manure (FYM) and poultry manure (PM) was tested. The yield of these attributes of sugar beet was increased but the estimating effect was higher for PM than FYM. The technological characters of sugar beet (Sugar percentage, Purity, K, Na and Alfa-amino-N) rose with increasing N fertilization rate with application of PM or FYM.Under conditions of the present work, supplying sugar beet with 350 kg N/fed with FYM or PM resulted in the highest root and sugar yields/fed.