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Two field experiments were carried out at the experimental farm of El-Minia University during 2003/2004 and 2004/2005 seasons to study the effect of sowing dates (20 th Sep., 10 th Oct. and 1 st Nov.), hill spacing (15,20 and 25 cm.) and Potassium-rates (0,24 and 48kg K2O/fad.) as well as their interactions on yield, yield components and quality of sugar beet, c.v. Raspoly. The experimental design was split-split plot with three replicationsThe main results could be summarized as follows. All characters for yield and its components and quality were significantly affected by sowing dates. Sowing beet plants on 10 th Oct. gave the greatest values of root length, root diameter, root fresh weight, foliage fresh weight/plant, yields of root, top and sugar. as well as TSS% and sucrose% in both seasons, while purity % recorded adversely trend in both seasons. Sowing beet plants on 1 st Nov. Produced the lowest averages from all traits, except purity % in the second season, while sowing beet plants on 20 th Sept. gave the highest average of purity % in the first season and vice-versa in the second one.Hill spacing of 20 cm. gave the highest value of root length and diameter, foliage fresh weight, yields f top, root and sugar as well as TSS % and sucrose % in both seasons, while purity % resulted the lowest one in both seasons. On the other hand hill spacing of 15cm. between beet plants produced the lowest averages from this traits in both seasons, except root yield/ fad and TSS % where the lowest values from this traits resulted from hill spacing of 25 cm. between plants the greatest values of root fresh weight as well as juice purity % obtained from 25cm. between hills in both seasons.All characters significantly increased with increasing Potassium rate up to 48 kg K2O /fad except purity % in the two seasons.The interactions indicated that the highest yield from root and sugar /fad was obtained by sowing beet on 10 th Oct. at 20 th cm between hills with 48kg k2o/fad.

Tow Field Experiments were carried out at EL-Itizaz village, Samalout district, EL-Minia Governorate, Egypt during 2004Egypt during /2005Egypt during and 2005Egypt during /2006 seasons to study the effect of foliar with potassium, magnesium and boron individaly and combined on yield and quality of sugar beet. The experiment included 15 treatments which were the combinations of two levels from each of foliar potassium 1 and 2 Liter 36% K 2O /fed, with 5.4 and 10.8 kg MgSo4/fed, boron (10 and 20 mg boric acid/fed) and control (foliar spray with water). These treatments were arranged in randomized complete block design with 3 replications.The obtained results indicated that spraying beet plants with K, Mg or boron either solely or in combinations significantly increased root length, root diameter, root and foliage fresh weights per plant as well as roots, top and sugar yields/fed. The highest values of this traits resulted from the combinations between the three elements at higher concentrations. Also, foliar spray with Mg individual and the combinations between the three elements took the same trend for root/top ratio in both seasons. On the other hand, control treatment (without spraying) gave the maximum averages of sucrose and TSS percentages, while the highest values of purity% resulted from foliar spray with the combinations between K, Mg or B at lower concentrations in both seasons.It, could be concluded that under the conditions of this study the highest roots and sugar yields can be produced by using foliar spray with the combinations.