Pot experiments using calcareous soil, were carried out to study the influence of irrigation with diluted seawater on tomato (Strain B) plants growth as affected by compost application and mycorrhhiza inoculation during summer 2011 season. Four different irrigation water salinity levels (0.44, 2.70, 6.20, 12.50 dS/m), three different mycorrhizal treatments (control, Glomus macrocarpium, Glomus intraradices) and three compost rates (0, 20, 40 g/kg soil) were used. Dry matter production in shoots of tomato plants was significantly decreased by increasing water salinity. Tomato plants were, adversely, affected only by high water salinity levels (6.20, 12.50 dS/m). However, a substantial increase in shoot dry weight of tomato plant of salt stressed tomato was observed with the compost application and arbuscular mycorrhiza fungi (AMF) inoculation. The N and P contents in shoot tomato plants were significantly increased as salinity increased from 0.44 to 6.20 dS/m. Sodium ion content was significantly increased with increasing the salinity of irrigation water from 0.44 to 12.5 dS/m. On another hand, K content decreased with increasing water salinity. Sodium reduced the contents and uptake of potassium due to ion antagonism. The enhancement in Mn, Zn, Cu, and Fe acquisition or increasing of shoot, dry wehight due to AMF inoculation was more pronounced with Glomus macrocarpium than Glomus intraradiaces under saline conditions. This is further confirmation that compost application and  mycorrhizal inoculation are beneficial for tomato plant grown under adverse conditions such as salinity stress.