الفهرس 
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Abstract
Field experiments were carried out in two successive seasons during the winter seasons of 2014/2015 and 2015/2016 under high polyethylene tunnels in a private farm located in Belqas District, Dakahlia Governorate, Egypt. The aim of this study is to improve the fruit yield and quality of the grafted cucumber (Cucumis sativus L.) cv. Nabeela F1 plants. The experiment included 16 treatments resulted from combination of four rootstocks (i.e, Jumbo , Star, Felxifort and Non-grafted ) were arranged in main plots and four foliar applications i.e., (salicylic acid at 200 mgL-1 , silicon at 100 mgL-1 , yeast at 10 gL-1and Tap water as a control ( were arranged in sub plots. The treatments were arranged in a randomized complete blocks design with three replicates.According to the obtained results in this investigation, cucumber cv. Nabeela grafting onto Jumbo rootstock sprayed with the yeast extract at 10 gm/L was the best treatment that could be recommended to obtain the highest yield as well as improve fruit quality, especially TSS% and vitamin C of cucumber fruits in north delta area and other regions with similar climate conditions.High tunnels cucumber- cucumber grafting- foliar application- yeast extract - cucumber production.