الفهرس 
Effect of bud load per vine on grape yield and qualityOnly 14 pages are availabe for public view
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Abstract
This study was conducted through the seasons of 2012 and
2013 to determine the optimum bud loads/vine and the number of nodes retained per cane for ”Early
Sweet” grapevines and to investigate the effect of pruning severity and cane length on fruiting,
quality and postharvest characteristics of ”Early sweet” grapevine. Five years old uniform vines
were chosen and pruned to four different levels of bud load, namely 48, 56, 64 and 72 buds/ vine.
Number of buds per cane adopted to 3, 4, 5 and 6 buds/cane. The results showed that the number of
bursted buds was increased significantly by increasing bud load/vine in the two seasons of this
study, while the percentage of bursted buds decreased. The bud fruitfulness was decreased by
increasing cane length. Data also indicated that 56 or 64 buds/vine were more suitable for pruning
of Early Sweet grapevines to produce good yield and fruit quality. On the other hand, 48 or 72
buds/vine was unfavorable since it produced rather compact clusters in both treatments, a low
cluster weight in the 72 buds/vine and low total yield in 48 buds/vine. In addition, pruning Early
Sweet grapes to 56 buds/vine by leaving 14 or 11 canes with 4 or 5 buds/cane, respectively resulted
in a good yield and quality, reduced cluster compactness and reduced shoot berries %. Increasing
bud load increased number of cluster/vine and increased yield per vine but reduced cluster weight.
Vines pruned to 56 buds / vine and 5 buds/cane gave the highest C: N ratio of the canes, cluster
weight, berry juice %, berry firmness, T.S.S and T.S.S/acid ratio. In this respect, vines pruned to 72 buds/vine and 5
buds/cane showed higher percent of titratable acidity than the other levels of bud load and cane
length.
Also data from the selected treatments for postharvest storability study - (8 canes with 6 eyes; 11
canes with 5 eyes; 16 canes with 4 eyes and 24 canes with 3 eyes) where fruits were stored at cold
storage (0 + 2°C and 95% RH) for 28 days followed by 5 days at market conditions (20 + 2°C with 85%
RH) - showed that vines adopted to 8 canes with 6 eyes or 24 canes with 3 eyes were higher in their
weight loss %, berry shuttering %, discarded berry %, and titratable acidity with no significant
effect on TSS whereas 11 canes with 5 eyes or 16 canes with 4 eyes were higher in their TSS/acid
ratios.
Data suggests that the best pruning management for “Early sweet” grape is to leave 56 bud/vine with
5 bud /cane which gave the most promising results in all measured parameters.