الفهرس 
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Abstract
The effect of foliar spraying with yeast extract and algae extract, as well as soil drench application with humic acid on vegetative growth parameters, root growth measurements, chlorophyll content, macronutrients content (N, P, k and Mg) and micronutrients content (Fe, Zn and Mn (ppm) of Prime grape transplants grafted on Freedom and Paulsen rootstocks were studied during 2018 and 2019 seasons.
Prime grape transplants grafted on Freedom grape rootstock exhibited higher values of most vegetative growth parameters than those grafted on Paulsen grape rootstock. All applied treatments were effective in increasing vegetative growth parameters than control, especially with combined treatment (yeast extract + algae extract + humic acid). Interaction value between the two studied factors showed that Prime grape transplants budded on Freedom rootstock and treated with combined treatment. Regarding to the highest values in this regard were recorded with Freedom compared to Paulson rootstocks, with significant differences between them. In addition, the treatment of yeast extract at 0.2% in first season and yeast extract at 0.4% in second season came next in producing high values of vegetative growth parameters.
However, the highest roots growth measurements were recorded by Freedom grape rootstock compared with Paulsen rootstock with significant differences between them. The highest values in this concern were recorded by the treatment of humic acid at 5 g/L whereas, the treatments of yeast extract at 0.4% and algae extract at 0.2% came next in this regard without significant differences between them. The highest interaction value was
obtained with Prime grape transplants budded on Freedom rootstock and treated with combined treatment (T8, yeast + algae
+ humid). Regarding to average fresh and dry weights (g/plant) of vegetative growth (top), it was clear that Prime grape transplants budded on Freedom rootstocks produced highest values of them than those budded on Paulsen rootstock with significant differences. The highest values of both fresh and dry weights of vegetative growth were recorded by combined treatment (T8, yeast + algae + humic acid). Interaction values of fresh and dry weights of top vegetative growth of Prime grape transplants were recorded by those transplants grafted on Freedom grape rootstock and treated with combined treatment (T8).
In any case, Freedom rootstock was superior to Paulsen rootstock in producing highest values of top- root ratios. The treatment of 2.5 g humic / L was superior and effective than other treatments in producing higher top – root ratios. Interaction values showed that Prime plant budded on Freedom rootstock and treated with 2.5 g / L humic acid produced the highest values of top-root ratios.
Leaf chemical analysis data showed that, the highest values of nutritional status measurements were exhibited by Prime grape transplants grafted on Freedom rootstock than those grafted on Paulsen rootstock with significant differences between them. Highest values in this concern were recorded by combining treatment which consisted of yeast extract 0.2% + algae extract 0.2% + humic acid 2.5 g/L (T8). The highest interaction values showed that, Prime grape transplants were obtained with those plants grafted on Freedom rootstock and treated with combining treatment. An opposite trend was found