Two field experiments were conducted during 2002-2003 and 2003 - 2004 seasons in Sakha Agric. Res. Station (ARC) Kafer EI-Sheikh Governorate to study the effect of foliar application with some organic acids (0. A.) namely citric, malic_e u-ketoglutaric and ascorbic adds at the levels of 0, 1000, 2000 and 3000 mg r' in two equal doses at 70 and 90 days from sowing on some chemical constituents, quality and yields of sugar beet plants. The obtained results revealed that: Foliar application with 0. A. induced significant increases of root length and diameter in the first season, fresh and dry weights of root and top/plant, photosynthesis pigments, i.e. chl. a, b and carotenoids, sugar fractions (redudng, non reducing and total soluble sugars) in both seasons. Also, 0. A. significantly improved N% and some technological parameters, i.e. sugar lost in molasses (SI.M) and sugar extractable 96 (SE %) but these increases were not significant for P %, K % and alkalinity coefficient It is important to mention that roots and sugar yields were significantly increased as well. On the contrary, purity % was significantly decreased. Foliar spray with citric add gave the best results than other 0. A. used, on the most studied traits. Regarding, the concentrations of 0. A., results indicate that foliar application of 0. A. at the level of 2000 mg 1⁴ significantly enhanced root length and diameter and fresh and dry weights of root and top/plant, sugar fractions, mineral composition, some technological parameters (SIM and SE %), roots and sugar yields. Whereas, 1000 mgf¹ level gave the highest photosynthesis pigments, I.e. chl. a, b and carotenoids. The interaction between 0. A. and their concentrations (C) significantly affected most studied traits compared with control. Studies offered that foliar spray with citric acid at 2000 mg ri at 70 and 90 days gave maximum roots and sugar yields.