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Salinity problem is a major abiotic stress affecting tomato growth. In Lebanon, the problem is rising in coastal zone and Northern (Baalback-Hermel belt) areas. The current work aimed to study the effect of Monopotassiumphosphate (MKP), Lithovit® (LITHO) (nano-CaCO 3 ), Glycine betaine (GB) and Aspirin (ASP) applied each in three concentrations (Low, Med and High) on tomato (Solanum lycopersicum L.) subjected to five salinity levels (EC=2,4,6,8 and 10 dS/m). Control treatments were those subjected to the five salinity levels with no products application. Results showed that increased salt stress reduced fresh weight of aboveground parts and roots while MKP-High improved fresh weight of aboveground parts at EC8 (by 44.6g) and EC10 (32.7g) and ASP-Med improved fresh weight of roots by 18g at EC10 compared to control. Root mass fraction was enhanced by Aspirin applied with all concentrations at EC2 and EC4 and by Lithovit at EC8. Dry matter accumulation in the aboveground parts was only improved by MKP at EC4, 6 and 10 and by Lithovit at EC6 and 8. Leaf area was reduced by 142.4g and cell electrolyte leakage was increased by 17% with increasing salinity. Lithovit enhanced leaf area with Lithovit-Med and total chlorophyll content with all concentrations at all ECs. Finally at EC4 total soluble solids increased following the application of Lithovit, MKP, ASP and GB with the highest concentrations, while Titratable acidity was increased only with GB-low. In conclusion, products' effects varied with EC level and applied dose.

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