الفهرس 
MATERIALS AND METHODSOnly 14 pages are availabe for public view
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Abstract
This work was carried out during 1998 and 1999 seasons on King’s Ruby grapes. Thesis included two
parts, the first one was carried out to study the effect of different levels of cluster shoulders
thinning alone or in combination with spraying sitofex (CPPU) or Naphthalene acetic acid (NAA) on
yield and quality .
Results showed that, spraying clusters with2.5,5 or 7.5 ppm sitofex had increased total yield,
cluster weight, length, width and volume, berry length & width, berry adherence strength, weight
of
100 berries,torus thickness, bruch length and berry juice%. With
regard to the remained shoulders per clusters ,it was clear that, unthinned clusters or those with
15 and more shoulders gave the highest total yield, cluster weight, length and volume, number of
berries per cluster, berry firmness and shot berries%. Vines sprayed with 2.5 or 5 ppm sitofex and
thinned to 10 or 15 shoulders produced the highest total yield, cluster weight, length, width and
volume, number of berries per cluster, berry length&width, berry adherence strength, weight of 100
berries, berry juice %, cluster compactness,T.S.S,T.S.S/acid ratio and anthocyanin .Additionally,
those clusters produced the least value of shot berries %.Maturity was delayed by 7-10 days.
However, spraying vines with NAA alone or in combination
with different levels of cluster shoulders thinning decreased total yield, cluster length,
width and volume, number of berries per cluster, berry length & width, weight of 100 berries,
berry juice%, cluster compactness, T.S.S, acidity and anthocyanin content. Unthinned
clusters or those with 15 shoulders gave higher values of total yield, cluster weight, length and
volume, number of berries per cluster and shot berries%.
The second part of this work was planed to study the effect of pruning severity on yield and
quality of King’s Ruby grapevines. Vines adopted to 0. 40, 60, 80 and 50 (control) buds/vine were
representing different bud load. Results showed that, vines pruned to 40, 50 (control) O’ 60
buds/vine compared to 20 or BO buds/vine produced the highest total yield, cluster length & width,
berry length & width, berry firmness, adherence strength, weight of 100 berries, torus thickness,
bruch length, berry juice%, T.S.S, acidity, T.S.S/acid ratio and anthocyanin content. However,
vines adopted to 20 and 80 buds/vine recorded the highest shot berries.
In both previous experiments, storage ability of previously treated clusters at ooc and 90% RH were
studied. All sitofex
treatments, unthinned clusters and clusters with 15 shoulders, recorded the high•3st decay % and
weight loss % during different cold storage periods. Clusters having 10 or 15 shoulders and sprayed
with 7.5 and 10 ppm sitofex showed an increase in berry shuttering. Sitofex appliction at 10 ppm to
unthinned clusters or with 10 and 15 shoulders, increased berry firmness. Clusters thinned to 5
shoulders and sprayed with sitofex at 0, 2.5 or 5 ppm recorded the highest T.S.S.
Similarly, spraying NAA in combination with different levels
of cluster shoulders thinning exhibited the highest decay % and weight loss%. Berry firmness was
increased in clusters sprayed with 200 ppm NPA under 5, 10 or 15 shoulders. Spraying NAA at
200 ppm at 15 8houlders increased berry shuttering, whereas unsprayed clusters with 5or 10
shoulders had on ircreased berry adherence strength.
Vines adopted to 40 or 50 buds/vine were higher in their decay %, weight loss %, berry shuttering,
firmness and adherence strength, T.S.S and T.S.S/acid ratio, with no clear effects on torus
thickness. shelf life and acidity.