The present study was conducted in the Experimental Farm, El-Khattara region, Faculty of Agriculture, Zagazig University, Sharkia Governorate, Egypt during 2009/2010 and 2010/2011 seasons. The study aimed to investigate the effect of nitrogen fertilizer levels (50, 75, 100 and 125 kg N/fad.) and biofertilization treatments (control, cerialine, potassiomag as well as cerialine + potassiomag) on yield and its attributes as well as juice quality of sugar beet under drip irrigation in sandy soils.

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... itrogen fertilizer level had significant effect on all traits in the two seasons and their combined analysis. Increasing N fertilizer levels from 50 to 125 kg N/fad., caused significant increase in root dimensions (length and diameter), fresh top weight/plant, fresh root weight/plant, Na%, K%, sugar loss in molasses percentage (SLM%) and root yield/fad. Top and recoverable sugar yields were responded only to 100 kg N/fad. The highest averages of sugar%, purity% and extractable sugar % were produced from using low nitrogen levels (either 50 or 75 kg N/fad.). Biofertilization treatments had significant effect on root length, fresh top weight/plant, fresh root weight/plant, Na%, K% as well as top and root yields/fad. However, root diameter, sucrose%, alpha amino N%, purity%, SLM% and alkaline coefficient (AC) did not significantly influenced by applying biofertilizers. The highest recoverable sugar yield/fad., could be obtained by using either cerialine alone or in combination with potassiomag. The interaction between studied factors revealed significant effect on fresh root weight/ plant, sucrose%, Na% and extractable sugar%.