Abstract
    
     In a greenhouse pot experiment, growth parameters of tomato (Lycopersicon esculentum.) cultivated in sandy soil were studied under salinity stress by Nacl i.e. (0, 1000, 2000, and 3000 ppm). Two applications were added to alleviate salinity stress, silicon and biofertilizers either individually or mixed. The diazotrophic bacteria, namely free-living Azotobacter  associative Azospirillum were inoculated to the tomato seedlings before planting. Results showed that , all vegetative growth parameters i.e. plant height , shoot and root fresh and dry weights were decreased with increasing salinity ,especially at 3000ppm. Application of  silicon alleviate salinity stress on tomato plant as well as chlorophyll content. Prolien content increased in leaves with increasing salinity . Biofertilizers mixed with silicon alleviate salinity stress.