The effect of some organic substances, Licorice extract and yeast extract either singly or in mixture as foliar spraying and soil application with different concentrations 10, 15 and 20 mg/L were investigated on Red Globe grafted grape cultivars on Freedom rootstocks. Vines used in the trial were eight years trellised by Gable system, with line spacing 1.5 x 3 m and grown in a sandy soil. Canopy division has typically been accomplished by training vines to the quadrilateral cordon system. The experiment was carried out during 2015 and 2016 seasons and it consisted of 11 treatments to improve the vegetative and reproductive growth of grafted vines. Results indicated that soil application of a combination of Licorice extract and yeast 20 mg/L was superior in stimulating all growth parameters with a significant effect on yield, cluster weight, the leaf area, leaf content of pigments, berry physical characteristics, TSS%, acidity, and anthocyanin, followed by soil application of Licorice extract and yeast 15 g/L, then the foliar spaying treatments which recorded significant increments in all characters in relation to the control.

The application of some organic materials, Licorice extract, yeast extract alone or in combination with each other as foliar spraying and soil addition with different concentrations 10,15 and 20 g/L was studied on Red Globe grapevines seedlings. The experiment was conducted in the 2015 season and extended for two successive seasons, comprised eleven treatments to improve the quality of grafted seedlings. Results indicated that soil addition in two concentrations 20 g/L and 15 g/L of a mixer of Licorice extract and yeast respectively were the most effective in stimulating all growth characters with a significant effect on leaf area, number of leaves, leaf content of N %, shoot length and diameter and root length and number, followed by the foliar spaying treatments which induced significant increments in all parameters compared to the control.

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