Si alleviated the effect of salinity stress on the plant fresh weight,
chlorophyll concentration, photosynthetic rate, and the leaf water content. Sub stomatal CO2and stomatal conductance decreased with application of Si. Si and N-Si improved photosynthesis rate, mesophyll
conductance, and plant water use efficiency under saline stress condition. No significant difference was
found between application of nano size of Si and Si. Overall, application of Si was beneficial in improving
the salt tolerance of the tomato plants