AN ATTEMPT TOWARDS IMPROVING BUNCH QUALITY THROUGH BERRY THINNING AND TRUNK GIRDLING TREATMENTS IN BLACK MONUKKA GRAPE | ||||
| Journal of Plant Production | ||||
| Article 12, Volume 31, Issue 10, October 2006, Page 6577-6593 PDF (205.53 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2006.236342 | ||||
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| Author | ||||
| M. A. Abd El- Wahab, | ||||
| Viticulture Res. Dept. Hort. Res. lnsL. Agric. Res. Center, Giza. Egypt | ||||
| Abstract | ||||
| This study was carried out to disclose the effect of beny thinning and trunk girdling treatments solely or in combination (for improving bunch and berry quality) on the date of harvest. yield, bunch and berry characteristics and vegetative growth of Black Monukka grapevines. Twelve conducted treatments were applied as follows: untreated vines (control), berry thinning (1) (Retention of five shoulders at the base of the bunch with the alternative removal of the branches and removing the terminal quarter of the bunch at 2- 3 mm berry diameter) (Bl). berry thinning (2) (The same technique described above berry thinning (1) with the removed portion being increased as to be half of the bunch) (Ba), girdling (1) after fruit set (by removing a narrow ring of the bark (2—3mm entirely around the trunk) (G1) and girdling (2) at veraison stage (G2). The results showed that all conducted treatments were effective in increasing average bunch weight and yieldivine except all (3;) treatments. Girdling after fruit sat alone or in combination with all berry thinning treatments improved physical characteristics of bunches and berries. girdling (2) at veraison stage alone or in combination with all berry thinning treatments increased T8896 of berry juice. TSSlacid ratio, improved berry colouration, while decreased acidity% of berry juice). Combination treatments of thinning, girdling (1) and girdling (2)) had the highest values of morphological and chemical estimates of vegetative growth compared with control. The obtained results revealed the superiority of Berry thinning (1) + Girdling (1) + Girdling (2) treatment owing to its positive effect on most of the studied characters. | ||||
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