Sugar beet (Beta vulgaris L. var. Trible) was cultivated in Sakha Res. St., Kafr El-Sheikh Governorate during two successive seasons (1997/1998 and 1998/1999) to study the effect of boron and manganese foliar  application under three levels of nitrogen fertilizer on the root and sugar yields as well as N, P and K uptake by sugar beet plant. The obtained results showed a significant increase in root, sugar yields, and NPK uptake with increasing applied N up to 80 kg N fed^-1 except the uptake of P by root was increased only up to 40 kg N fed^-1 application. Concerning the foliar application of boron data indicated that boron at 100 ppm increased sugar yield in 1^st season whereas at 200 ppm had no significant effect on root, sugar yields in both season whereas it increased significantly N, P and K uptake in two seasons except K uptake in the second season. Data also showed that manganese applied at 2000 ppm had significant effect on root and sugar yields as well as N, P and K uptake by plant in both season. The positive effects of interaction between N, B and Mn on the studied variables were also discussed.