Effect of New biostimulants based on amino acids on Medicinal Mint (Mentha spicat L.) under salinity stress

Nowadays, the use of eco-friendly bio-products such as biostimulants is of great interest because it also contains some free amino acids in addition to nutrients, This study was conducted to investigate the effect of two bio-products based on free amino acids on medicinal mint (Mentha spicat L.) under salinity stress. The experiment was conducted as a factorial experiment in a randomized complete block design with three replications in the research greenhouse of Shahid Bakari Higher Education Research Center in Myandab.The results showed that simple and interaction effects of salinity and amino acids on measured traits were significant at 1% probability level. The highest plant height, crown diameter, root diameter, plant fresh weight, chlorophyll b were obtained in 0 mM salinity and Kadostim foliar application, and soluble sugars in 75 mM salinity and Kadostim foliar treatment. Maximum root length, leaf number, plant dry weight, and chlorophyll a were obtained in 0 mM salinity and Humiforte treatment. The highest amount of total .chlorophyll was obtained in 25 mM salinity and Humiforte and the highest proline content was in 75 mM salinity and Kadostim The highest relative humidity content in salinity of 0, 50 and 75 mM salinity was related to Humiforte treatment but in 25 mM salinity treatment was related to Kadostim treatment There was no significant difference in the percentage of essential oil at 0 mM salinity between the treatment of Kadostim and HumiForte but it was significantly higher than control.