الفهرس 
Response of prime seedless grapevines to spraying of boron and glutathioneOnly 14 pages are availabe for public view
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Abstract
This research was carried out during the seasons of 2018 and 2019, on 42
vigorous 5- years old of Prime seedless grapevines grown in a private orchard located west at Abou Qurqas (El- Dakahlia Agriculture Development Compaq), El- Minia
Governorate, Egypt where the soil texture is sandy. The chosen vines are grown at 2.0 x 3.0meters apart.
The selected vines (42 vines) have been pruned via spur pruning method 72
eyes/vine leaving (15 fruiting spurs x four eyes plus six replacement spurs x two eyes)Using Gable’s method of support. During both seasons, winter pruning was carried out
in mid-December. The drip irrigation system was followed using 650 ppm well water.
This study examined the effect of single and combined applications of boric acid and glutathione at different concentrations on vegetative growth, yield and fruit quality of Prime seedless grapevines.
This experiment consisted of seven treatments from single and combined
applications of glutathione and boric acid in addition to the control treatment and arranged as follows:
1- Control (spraying with water only).
2- Spraying 0.05 percent (0.5 g/L) of boric acid.
3- Spraying 0.1 percent (1.0 g/L) of boric acid.
4- Spraying 0.05 % (0.5 g/L) of glutathione.
5- Spraying 0.1 % (1.0 g/L) of glutathione.
6- Spraying combination of boric acid at 0.05 % plus glutathione at 0.05%.
7- Spraying combination of boric acid at 0.1% plus glutathione at 0.1%.
Three replicates were used per treatment, including two vines per replicate. Both
boric acid and glutathione were sprayed three times at starting of growth (1st week
of Mar.), just after berry setting (1st week of Apr.) and at one month later (1st week
of May).
Randomized complete block design (RCBD) was adopted.
The following measurements during both seasons were recorded:
1- Development of vegetative characteristics specifically, shoot length (cm),
average weight of twenty mature and fresh leaves (g), leaf area (cm)2
, coefficient of wood ripening, weight of pruning wood / vine (kg) and cane thickness (cm).
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2- Leaf pigments namely chlorophyll A, chlorophyll B and total chlorophylls
(mg/g F.W.)
3- Percentages of N, P, K, Ca, and Mg and boron content (ppm) in leaf petioles.
4- Yield in terms of weight (kg) and number of clusters per vine.
5- Weight (g) length and shoulder (cm) of the cluster.
6- Percentage of shot berries.
7- Physical and chemical properties of berries, namely berry weight (g)
longitudinal and equatorial (cm), T.S.S. percent, percentage of total acidity (as
g tartaric acid/ 100 mL juice) and reducing and non reducing sugars.
Obtained results during both seasons could be summarized under the following main
topics.
1-Vegetative growth characteristics:
Growth aspects namely main shoot length, average weight of twenty mature and
fresh leaves, leaf area, wood maturation coefficient, wood pruning weight and cane
thickness stimulated in response to boric acid independent and mixed applications and
glutathione each at 0.05 to 0.1 % compared to the control. Rising concentrations were
correlated with the stimulation. In this respect, the use of glutathione was significantly
stronger than the use of boric acid. Combined applications have also been favourable in this regard than using each compound alone. Using boric acid and glutathione each at 0.1% gave the highest values.
2-Chemical constituents of leaves:
Subjecting the vines to single and combined applications of boric acid and
glutathione each at 0.05 to 0.1% was greatly accompanied with enhancing chlorophyll
a, chlorophyll b and total chlorophylls compared to the control.
spraying boric acid and glutathione each at 0.1% gave the highest values of N, P, K,
Ca, Mg and B in the leaf petioles.
3-The yield and cluster aspects:
All yield parameters were greatly improved in response to boric acid application alone and mixed withe glutathione each at 0.05 to 0.1 compared to the control treatment.
Promotion was proportional to the rise in levels. Using glutathione was superior, in 76addition, the combination of applications using boric acid was preferable than the use
of each one alone in improving yield and cluster aspects.