الفهرس 
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Abstract
This investigation was carried out in greenhouse at Horticultural department, Faculty of Agriculture at Moshtohor, Benha University. The first experiment was carried for three grafting times from 1st of July 2009 to 30th of December 2009, aiming to distinguish the most suitable grafting techniques for tomato plants. Three grafting techniques were applied ”cleft, tongue approach and hole insertion technique”. Results lead to concluded that the cleft grafting was the best techniques among all investigated. Upon the results of the first experiment the cleft grafting technique was applied in second experiment. The second experiment was carried out during two growth seasons of 2010 (1st of February to 30th of May) and 2011 (1st of December 2010 to 30th of May 2011) to find out the effect of four rootstocks (Heman, 1G-48-6031, 1G-48-6032 and Edkawy) on tomato growth, yield and fruits quality of two cultivars (Reem and Karnak) compared to non-grafted or self-grafted plants of both cultivars under four salinity levels [448 (control of irrigation water), 2000, 4000 and 6000 ppm]. The results showed that all investigated factors ”cultivars, rootstocks and salinity levels” affected significant tomato growth, chemical composition, fruit quality and the total yield. Whereas, increasing salinity levels reduced tomato growth, leaves nutrients contents and yield. Meanwhile the grafting treatments either individual or their interaction reversed this results where the grafted treatments increased tomato growth, leaves nutrients contents and yield compared to non-grafted plants of both cultivars under salinity levels. finally, the combination of Reem cv. grafted on Heman rootstock increased total yield by 42.0, 70.8, 74.1and 119.1 % when irrigated by salinity levels 448, 2000, 4000 and 6000 ppm respectively compared to control (non-grafted plants of cv. Reem with the same salinity levels, respectively).