الفهرس 
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Abstract
A- Vegetative characters A.1. Effect of the studied companion crop percentages:
The resulted indicated that all added percentages (50, 75, and 100%) gave significantly lower values for root length, root diameter, root fresh weight and leaf area per plant compared to sole sugar beet crop. A. 2. Effect of the companion crop species:
The results indicated that all characters of sugar beet were decreased in the order faba bean > barley > wheat, respectively. A. 3. Effect of the interaction between different companion crop percentages and companion crop species on vegetative characters.
The data of companion crop percentages × companion crop species revealed that the highest vegetative characters values for sugar beet resulted from intercropping the lowest percentage (50%) of all crop species with 100% sugar beet, while the maximum values were recorded for 50% of wheat with 100% of sugar beet. B- Yield characters :
B. 1. Effect of the studied companion crop percentages:
The results showed that all sugar beet characters were reduced with increasing percentages of companion crop compared to the pure stand in the two seasons, except harvest index which showed little or no variation in the first and second seasons, respectively.
B. 2. Effect of the companion crop species: The results indicated that cereal crops were less competitive with sugar beet compared to faba bean, and within the cereals, wheat was less competitive than barley. B. 3. Effect of the interaction between different companion crop percentages and companion crop species on yield characters: Interaction between companion crop species and their intercropping percentages had significant effect on yield characters, except top/root ratio and harvest index. The biological and root yields gave the highest values for all crops at 50% intercropping and the values were highest with intercropping wheat with sugar beet and the lowest when sugar beet was intercropped with faba bean at all percentages. However, the top/root ratio showed insignificant variations at 75 and 100%, but at 50% wheat gave higher values than barley and faba bean. Moreover, harvest index was insignificantly affected by intercropping wheat and barley at all percentages, but 50 and 75% intercropped faba bean were of significantly higher harvest index values than 100% intercropped faba been.