Two field experiments were conducted in the Agricultural Research Station
Farm to study the effect of potassium fertilizer on mineral composition (Fe, Cu. Mo.
and Zn), biochemical components (0 amino nitrogen, sodium and Peroxidase
isozyme) and some characters of sugar quality (T,S.S, sucrose and purity%). The
experiments were carried out in a split plot design with 3 replicates. The treatments
were 4 rates of K20 (O, 30. 60 and 90 kg of K20) and two types of sugar beet: 5
monogerm (Inverse, Prisma, Oe1936, Sophie and Universe) and 5 mulligerm (Baraka,
Farida, Respoly, Pleno and Sultan).   The data showed that adding K resulted a signifteant increase in the
concentration of Nand K in both roots and leaves and that the monogerm types
contained more N than the multigerm one. Phosphorus increased up to 30 units of
K20 and then began to decrease as the added K increased. Concentration of
micronutrients (Fe, Cu. Mn and Zn) increased in both roots and leaves as the K added
increased but by different degrees depending on the differentiating in varieties as it
were affected significantly. At the same time there was great response to the varieties
among the T.S.S. sucrose and purity% where they increased by about 33.4, 3.55 and
15.4%. respectively. with the increase in K added. The significant increase in a amino
nitrogen and sodium revealed the effect of potassium on protein synthesis. The
treatments with potassium showed atso an increase in the cathode and anode band
activities for the two varieties, which differed from the untreated plants.