Abstract
This study was carried out during 2015 and 2016 seasons to examine the effect of spraying glutamic acid at 100 to 400 ppm and/or boric acid at 0.025 to 0.1% on growth aspects, vine nutritional status, yield, berries colouration%, sunburned berries% as well as physical and chemical characteristics of Red Globe grapes. Subjecting the vines to glutamic acid at 100 to 400 ppm and/or boric acid at 0.025 to 0.1 % was very effective in enhancing main shoot length, leaf area, number of leaves/shoot, wood ripening coefficient, cane thickness, pruning wood weight, chlorophyll a & b, total chlorophylls, N, P, K, Mg, yield, cluster weight and dimensions, berries colouration% and both physical and chemical characteristics, it is relative to the control treatment. Percentage of sunburned berries materially tended to reduce with the present treatments. Using glutamic acid was favourable than using boric acid in this respect. Combined application of glutamic acid and boric acid obviously surpassed the application of each alone in this respect. The best results with regard to yield, berries colouration and quality of the berries were recorded on the vines that received three sprays (growth start, just after berry setting and one month later) of glutamic acid at 200 ppm+ boric acid at 0.05%.
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