Effects of different organic fertilizers on quantitative and qualitative characteristics of Melissa officinalis L. under Glomus mosseae mycorrhizal symbiosis

In order to evaluate the effect of organic and biological fertilizers on quantitative and qualitative characteristics of Melissa officinalis L. a factorial experiment was conducted in a completely randomized design with 4 replications in the form of open air pot conditions in Sari, in 2015. The factors examined included Mycorrhizal fungi (Glomus mosseae) (0 and10% of the pot volume), vermicompost (0 and 10% the pot volume), and compost tea (0 and 1.5 liter). Some characteristics such as number of flower, nitrogen, phosphorous, and potassium contents of aerial parts. Results showed that application of organic and mycorrhizal fertilizers had a significant impact on all measured characteristics and increased the number of flowers and fresh weight when compared with those of the control group so that the highest nitrogen concentration and the stem diameter were obtained from the combined mycorrhizal symbiosis, compost tea, and vermicomposting treatment. The triple interaction effects showed that the absence of vermicompost with compost tea, and mycorrhizal symbiosis treatments increased the fresh weight compared to the control. Results also indicated that using vermicomposting, compost tea, and mycorrhizal symbiosis through the availability of nutrients increased the yield and improved qualitative and quantitative characteristics of Melissa officinalis L..