الفهرس 
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Abstract
Two field experiments were conducted in Sakha Research Station Kafr El-Sheikh Agrictiltural Research Center during 2002/2003 and 2003/2004 seasons to investigate the effect of boron and molybdenum fertilizer levels on yield and quality of some sugar beet varieties.
This study included 27 treatments which were the combination between three sugar beet varieties (Montebianco, Kawemira and Gloria), three boron fertilizer levels (zero, 0.50 and 1.00 kg B/fed) and three levels of molybdenum fertilizer (zero, 0.25 and 0.50 kg Mo/fed).
Treatments were arranged in a split plot design with three replications. Varieties were allocated the main plots and the combination between levels of boron and molybdenum were assigned at random within sub-plots. Plot area was 17.5 m2 consists of five ridges 7 m in length and 2.5 m in width and the space between ridges 50 cm and between hills 20 cm.
Results could be summarized as follows: I. Growth measurements:
a. Effect of seasons:
1. Results pointed out that root diameter as well as leaves fresh weight/ plant were insignificantly affected by the growing seasons.
2.Root fresh weight/ plant showed significantly response to the growing season at 120 and 150 days from sowing.
3.Total soluble solids (TSS %) were significantly affected by the growing seaons. Sucrose percentage, significantly affected at 120 days from sowing only. Juice purity percentage, significantly affected by growing season at 120 days from sowing as well as 180 days from sowing.
b. Varietal performance:
1.Root dimensions and root fresh weight/plant were significantly affected by the three studied varieties at the three sampling dates, except top fresh weight at 120 and 150 days from sowing. Montebianco variety gave the highest values of the studied traits followed by Kawemira, while Gloria variety
gave the lowest ones.
2.Total soluble solids, sucrose and purity percentages were significantly affected by varieties at the three growth stages. Montebianco variety recorded the highest values of total soluble solids, however, it gave the lowest values of sucrose and purity percentages. On the other hand, variety Gloria gave the lowest values of total soluble solids percentage, meanwhile, it gave the highest values of sucrose and purity percentage at
the three growth stages.
c. Effect of the interaction between varieties and seasons:
1.Top fresh weight in the three samples was insignificant.
2.Root length, diameter in the third stage and root fresh weight in the first and second stages were significant.
3. Total soluble solids, sucrose and purity percentages were insignificantly affected by this interaction at the three stages.
d. Effect of boron fertilizer levels:
1.Root dimensions were significantly increased as the boron level increased from 0.50 to 1.00 kg B/fed in the combined for the different growth stages.
2.Root fresh weight/plant was significantly increased in first and second seasons at the three samples with increasing boron level up to 1 kg B/fed except at 150 days in second season was
insignificant.
3.Top fresh weight/plant was insignificantly affected by boron
level in the first and the second seasons and their combined at
120 and 150 days from sowing, however it was increased
significantly by increasing boron up to 1.00 kg B/fed at 180
days from sowing.
4.Total soluble solids percentage was significantly affected by boron fertilizer levels in the various growth stages in both seasons and their combined.
5.Sucrose and purity percentages increased statistically by increasing boron at all growth stages of the two seasons and their combined, except when the plant aged 120 days.
e. Effect of the interaction between boron fertilizer levels and
seasons:
1. Root dimensions, root and top fresh weight/plant were insignificantly affected by this interaction, except at 120 days
from sowing.