Pyrolysis of waste organic materials by thermo chemical conversion under limited oxygen supply results in production of porous carbon-rich material, known as biochar [1]. Salinity stress limits plant growth and development by diversely affecting various physiological and mineral concentration of plants [2]. Biochar can mitigate harmful influence of salinity on plants. Therefore, a pot factorial experiment based on completely randomized design with four replications was performed to evaluate the effect of biochar on photosynthetic pigments and Na+, K+ and Na/K ratio of summer savory (Satureja hortensis L.) under irrigation with NaCl solution. Three salinity levels (0, 40 and 80 mM of NaCl) and three levels of biochar (0, 1, 2 %w/w of soil) were arranged. According to the results of this study the highest chlorophyll a and carotenoid content were observed at 80 mM NaCl with using 2% of biochar. However, the highest chlorophyll b and total chlorophyll content were observed at control plant (without salinity stress and biochar application) and as well as in treatment of using 2% of biochar without salinity stress, respectively. On the other hand by increasing NaCl concentration the concentration of Na+ increased, but K+ concentration and K/Na ratio were decreased in leaves summer savory. In total, application of biochar can reduce negative effects of salt to protect summer savory against NaCl stress.

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