الفهرس 
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Abstract
SUMMERY AND CONCLUSION
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combined application at 1000 mg NaCL. However , the lowest value was found at3000 mg NaCL. Application of Silicon or biofertilizers alone or combined alleviated the dangerous effect of salt stress.
We concluded that, The application of silicon or biofertilizers i.e. (Azotobacter + Azospirillum) alleviated the dangerous effect of salt stress on tomato plants.
Application of silicon or biofertilizers single or combined increased plant growth parameters.
The best treatment was mixed application Si+Biofertiliers).
Application of silicon or biofertilizers single or combined stimulated microbial activity in the rhiosphere soil.