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During 2014 & 2015 seasons, Superior grapevines were treated three times with potassium silicate and/or glutathione each at 0.05 to 0.2%. The merit of this study was examining the effect of single and combined applications of potassium silicate and glutathione at different concentration on growth and fruiting of Superior grapevines. Treating the vines with potassium silicate and/or glutathione three times at 0.05 to 0.2% was very effective in enhancing growth aspects, leaf pigments, nutrients, yield and both physical and chemical characteristics of the berries over the control treatment. The promotion was associated with increasing the concentrations. Negligible promotion on these parameters was observed among the higher two concentrations namely 0.1 and 0.2%. Using glutathione was greatly superior than using potassium silicate in all parameters. Conclusively, according to the obtained data, it is suggested to use a mixture of potassium silicate and glutathione each at 0.1% three times at growth start, just after berry setting and at one month later gave the best results with regard to yield and berries quality of Superior grapevines.

TRIALS FOR IMPROVING THE PRODUCTIVITY AND REDUCING SHOT BERRIES IN SUPERIOR GRAPEVINES BY USING SILICON AND GLUTATHIONE