الفهرس 
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Abstract
The present investigation was suggested to study the chemical composition of two sugar beet varieties [Ceres poly (P3) and Pleno] that collected from El-Hamoal, Belkas and El-Reyad regions of Kafr El-Sheikh and Dakahlea Governorates, Egypt at different periods and the storage ability of the beet root of two varieties. The effect of spraying roots with solution of 10% sodium bisulphate on their properties during storage conditions was also investigated. The specific activity of invertase during storage and treatment was estimated. The effect of different treatments with some chemical materials for removing the colouring matters from raw sugar beet juice was also studied. The main results of this study are summarized in the following points: 1- The chemical composition results of the two varieties that harvested at the end of cultivation period (2 10 days) are: The moisture content ranged between 76.39 and 77.85%, total soluble solids (T.S.S.) between 20.50-22.00%, ash 3.97-5.19%, crude protein 3.80-4.97, total carbohydrates 83.04-85.82%, sucrose 69.57-76.03% and reducing sugars was between 0.72 and 1.2 1 %. The results indicate that, Ceres poly (P3) variety collected from El-Rayad region was the best variety which contain about 76.03% sucrose, while the same variety from El-Hainool region contain about 75.57% sucrose. The lowest one in sucrose content was the Ceres paly (P3) collected from Belkas region which contain about 69.59%, and Pleno variety collected from El-Hamool region which contain about 69.67%. Pleno variety collected from El-Hamool region had the highest value of (T.S.S.) 22.00%, but the same variety which collected from El-Reyad region had the lowest value of (T.S.S.) 20.50%. It is observed that the variety and cultivation region have a great effect on the sugar beet qualities. The period of (21 0 days) was the best period for harvesting. 2- The results revealed that the storage of sugar beet roots under cooling at (5•‹C) caused the lowest relative losses of weight where ranged between 13.46% in case of El-Rayad sprayed Pleno variety and 18.32% with untreated Ceres poly (P3) variety, followed by at room temperature, the relative losses ranged from 28.65% to 34.76%. While the storage in open area was the worst one, the relative losses ranged from 3 1.58% to 41.63%. Sprayed roots with solution of (10% sodium bisulphate) decrease the relative losses of weight approximately by about 1.00% of stored samples. 3- The losses of moisture content in Pleno variety were less than the losses in Ceres poly (P3) at different storage conditions. Storage under cooling was the best treatment followed by at room temperature (under shaded area) and the worst one was in open area storage. The relative losses in moisture content of two sugar beet varieties that treated by spraying with soluation of (1 0% sodium bisulphate) were less than those mentioned in untreated samples (control) 4- There was an increase in total soluble solids (T.S.S.) during storage conditions in both varieties, the lowest change was recorded with cooled samples. While the highest increase was observed in samples that stored in open area and at room temperature as a results of high loss of their moisture content under such conditions. In this respect, results indicate that no clear difference was recorded between sprayed and untreated samples.