Omran,, Y., Ramadan, T., EI-Boral, F. (2005). APPLICATION OF YEAST AND" OR HYDROGEN CYANAMIDE FOR IMPROVING VINE VIGOR, BUD BEHAVIOR AND FRUIT QUALITY OF THOMPSON SEEDLESS GRAPEVINES. Journal of Plant Production, 30(7), 4055-4071. doi: 10.21608/jpp.2005.237448
Y. A. M. M. Omran,; T. Ramadan; F. M. EI-Boral. "APPLICATION OF YEAST AND" OR HYDROGEN CYANAMIDE FOR IMPROVING VINE VIGOR, BUD BEHAVIOR AND FRUIT QUALITY OF THOMPSON SEEDLESS GRAPEVINES". Journal of Plant Production, 30, 7, 2005, 4055-4071. doi: 10.21608/jpp.2005.237448
Omran,, Y., Ramadan, T., EI-Boral, F. (2005). 'APPLICATION OF YEAST AND" OR HYDROGEN CYANAMIDE FOR IMPROVING VINE VIGOR, BUD BEHAVIOR AND FRUIT QUALITY OF THOMPSON SEEDLESS GRAPEVINES', Journal of Plant Production, 30(7), pp. 4055-4071. doi: 10.21608/jpp.2005.237448
Omran,, Y., Ramadan, T., EI-Boral, F. APPLICATION OF YEAST AND" OR HYDROGEN CYANAMIDE FOR IMPROVING VINE VIGOR, BUD BEHAVIOR AND FRUIT QUALITY OF THOMPSON SEEDLESS GRAPEVINES. Journal of Plant Production, 2005; 30(7): 4055-4071. doi: 10.21608/jpp.2005.237448
APPLICATION OF YEAST AND" OR HYDROGEN CYANAMIDE FOR IMPROVING VINE VIGOR, BUD BEHAVIOR AND FRUIT QUALITY OF THOMPSON SEEDLESS GRAPEVINES
1Viticulture Department, Horticultural Research Institute, Agriculture Research Center, Giza, Egypt,
2Botany Department, Faculty of Science, Asslut University, Egypt
3Horticulture Department, Faculty of Agriculture, Asslut Unlv., Egypt
Abstract
FIeld experiment was carried out at the Orchard faculty of Agriculture. Assiut University during three consecutive seasons 2001. 2002 and 2003 on 6-years-old Thompson Seedless grapevines, planted at 1.5x 3 meter in a loamy clay soil. Yeast and lor hydrogen cyanamide (He) and the time of application affected on the percentage of bud fertility and the results were greatly variable with no trend from season to another; but the highest percentage showed by application of yeast at May. Yeast or He significantly inhibited catalase activity and increased bud burst. Application of He at January advanced the timing of bud burst. and gave earliness by about one month compared to control or application of yeast. In the same trend. yeast earlier period from bud burst to full bloom by one - three weeks; hence the vines of all treatments reached full bloom on 10-18 April. Application of yeast at April and May significantly increased fruitful buds. Most treatments improved vine vigor indica1ed by increasing the shoot length and thickness, number of leaves and leaf area. All vegetative parameters have reflected on the metabolism and parallelly increased the mass of pruning WOOd, total yield and contents of total carbohydrates and nitrogen in canes. Berries number per bunch and bunch weight were correlated with the weight of rachis. The best juice quality with decreased lotat acidity and increased TSS/acid ralio was obtained by application of yeast at April and May, or when used in combination with He.
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