Thesis (Ph.D.) - Cairo University - Faculty of Agriculture - Department of Vegetable

This experiment was carried outat the Experimental Farm of Faculty of Agriculture, Cairo University, Giza, during the two successive seasons of 2016and 2017. The experiment was to study the effect of three water regime, 5 m3 (50%), 7.5 m3 (75%) or 10 m3 (100%) /daily/ Fed, of the water holding capacity of two cultivars 'Strain-B' and 'Super Marmande', each with eight treatments ,( i.e. grafting tomato ontoStrain-B hybrid, SolanumpimpinellifoliumL,Edkawy cultivar orDatura stramonium rootstocks as well as using biochar, hydrogelamendment or inoculation with arbuscularmycorrhizal fungi as compared with control treatment.A randomize complete block design with three factors was used for analysis all data with three replications for each parameter. The results indicated that drought stress (DS) treatments (75% and 50% of water requirements) caused significant reduction in tomato plant height, fruit weight, fruit length, fruit diameter and total yield of tomato as well as chlorophyll readings and NPK content in tomato fruits, whereas,TSS%, vitamin C, lycopene content and ABA concentration was significantly higher in drought stress treatments than normal irrigation treatment. On the other hand, all agricultural treatments that used enhanced growth, fruit quality, total yield and chemical composition of tomato as compared with control. In this respect, using Datura stramonium as a rootstock was the best treatment for improving growth and yield of tomato plants

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