الفهرس 
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Abstract
Sugar beet is one of the most important sugar crops in the world, with beet sugar accounting for 28.5% of world sugar production.Sugar beet is the second most important sugar crop in Egypt after sugar cane yield to increase local sugar production and fill the consumption gap. In 2016, the self-sufficiency rate reached 69.5% of white sugar.This study was conducted at the Sakha Research Station - Kafr El-Sheikh Governorate - Egypt during the 2016/2017 season to study the effect of storage after harvest during March under various storage conditions in sunlight (Covered with beet throne, rice straw and without covering) and (Storage in the shade (covering with throne, covering with rice straw and without covering).The obtained data indicated that:Chemical analysis showed that the beets of roots contain 77.9-67.78% moisture, 0.76-2.49% ash, 0.639-2.822% fiber, 18.83-27.6% total soluble solids, 18.22-10.59% sucrose, 0.43-2.42% reducing sugars, 1.37-2.80% alpha amino nitrogen, 1.93-2.97% sodium and 2.87-3.99% potassium.The technological characteristics of beet roots showed that the percentage of white sucrose was 15.2-7.2%, that the percentage of sucrose lost was 1.52-2.17% and the purity of the extracted juice from beet roots was 94.25-85.59%. The alkali ratio was 3.7-2.47%.The moisture content during the storage period was decreased in the stored beet roots. The highest moisture loss was observed in the roots stored in the sunlight without covering compared with the roots which stored in the shade. The lowest loss of moisture was in the roots stored in shade and covered with the throne.The percentage of fiber in the stored beet roots was observed during the period of storage. There was the least noticeable increase in the beet roots stored in the shade and covered with the throne, while the highest percentage recorded in increasing the percentage of fiber in the beet roots stored in sunlight and without coverage compared to other treatments.The percentage of ash was increased during the storage period in the stored beet roots. The height ratio varied, with the largest increase recorded in the beet roots stored in the sunlight compared to the roots stored in the shade and the highest percentage in the beet roots stored in sunlight and without coverage compared to the beet roots covered with the throne and the beet roots covered with rice straw and stored in Light, while the least noticeable increase was in the beet roots stored in the shade and covered with the beet throne.
The percentage of total soluble solids in the beet roots during the storage period was the lowest in the beet roots stored in the shade and was the lowest on the level of beet roots covered with beet throne and the highest percentage of total dissolved solids in the beet roots stored in sunlight, which were above the beet roots stored without covering.The percentage of sucrose in the roots of beet roots decreased during the storage period due to increased respiratory rates and enzyme activity, where the highest percentage was observed in the stored beet roots in sunlight and the highest was the decrease in the stored beet roots without covering compared to the other covered roots either in the throne or rice straw. The shadow is less volatile, and the least of the beet roots are stored in the throne compared to the treatments.