الفهرس 
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Abstract
This study was carried out during the two successive seasons of both 2016 and 2017 on
seven years old ‘Crimson Seedless’ grape trees (Vitis vinifera L.). Trees were planted in sandy
soil conditions in a private orchard located at EL- Nobaria , EL-Beheira, Governorate, Egypt.
The trees were spaced at 1.5 x 3 m apart and irrigated by drip irrigation system and received
similar cultural practices adapted in the orchard. The present investigation aimed at study the
Improving coloration, fruit quality and yield of crimson seedless grapes grown under black net
by foliar application of abscisic acid and potassium phosphate. This experiment consisted of
fourteen treatments arranged in a spilt plot design with four replicates for each treatment and
one tree for each replicate.
The treatments were as follows:
A) Main plots (Shading method)
Open field
Black net (Shade)
B) Sub-plots ( pre- harvest treatments )
Control (water spray only)
Abscisic acid at 100 mg / l.
Abscisic acid at 150 mg / l
Abscisic acid at 200 mg / l
Potassium phosphate 2.5 g / l
Potassium phosphate 5 g / l
Potassium phosphate 7.5 g / l
The results of this experiment could be summarized as follows:
5.1 Yield and physical quality attributes
Black net treatment recorded the maximum values of berry length, berry diameter, L/D
ratio, weight of 100 berry, size of 100 berry, cluster length, cluster diameter, cluster weight,
yield / vine, yield / fed and fruit firmness, respectively, during both seasons, as compared
with open field treatments which recorded the lowest mean values of this traits.
Increasing potassium phosphate consternation up to 7.5 g/l recorded the highest mean
values of berry length, berry diameter, L/D ratio in the second season, weight of 100 berry,
size of 100 berry and fruit firmness, as compared with control treatment, during both
seasons.
Abscisic acid concentration up to 200 mg/l gave the maximum values of L/D ratio in the
first season as compared with control treatment.
The interaction among shade and pre-harvest treatments on berry length, berry diameter,
L/D ratio, weight of 100 berry, size of 100 berry and fruit firmness was highly significant
of all characters during both seasons.
Increasing abscisic acid concentration up to 200 mg/l gave the maximum values of cluster length, cluster diameter, cluster weight, yield/vine and yield / fed during both seasons.
The interaction between shade and pre-harvest treatments was highly significant of cluster
length, cluster diameter, cluster weight, yield / vine, and yield / fed during both seasons.