Abstract In the most regions of the world, salinity stress is the most important stress that limits the growth of plants and its performance by decreasing the Osmotic potential and disrupting the absorption of water and some nutrients. Salicornia plant is belongs to the chenopodiaceae of family, which it is cotains 5gnus and 6 species in Iran. The leaves are reduced and hairless in this plant and it may have changed to a certain extent. Potassium nitrate is a chemical substance that it is used a lot to increase the germination of seeds. An experiment was carried out in2019 in the research greenhouse of Malayer University in a factorial manner in the form of a completely randomized design, to evaluate the effect of different concentrations of potassium nitrate on the morphophysiological characteristics of Slicornia Persica under salinity stress. On the other hand, salinity caused a reduction in the amount of photosynthetic pigments. The amount of Proline increased at 300ppm salinity and decreased at 600ppm salinity. Generally, It can be conclded that spraying of Salicornia Persica with potassium nitrate improved the growth and tolerance of this plant against salinity stress and improved the effects of salinity.
