Effects of manure and phosphate solubilizing biofertilizer on growth, yield and essential oil quality of dragonhead (Dracocephalum moldavica L.) in Firouzkuh region

In order to study the effects of manure and phosphate solubilizing biofertilizer on growth, yield and essential oil quality of dragonhead, an experiment was conducted as factorial experiment contain manure (0, 10 and 20 ton/ha) and biosuperphosphat biofertilizer (non-inoculated and inoculated seeds), in the base of randomized complete blocks design with three replications at research field of Agriculture Company of Ran in Firouzkuh of Iran in 2015. The results showed that the highest flowering shoot no./plant in application of 10 t/ha manure and the highest dry weight of plant and essential oil yield in applying 20 ton/ha manure were obtained. Biosuperphosphat biofertilizer showed significant effects on studied traits, as the highest flowering shoot no./plant, dry weight of plant, essential oil yield and geraniol percent and linalool percent in treatment of application of biosuperphosphat (inoculated seeds) were obtained. Also, the intractions effect of factors on yield of flowering shoot, essential oil content and geranyl acetate percent in essential oil were significant, as the highest yield of flowering shoot in treatment of 20 t/ha manure and without application of biosuperphosphat and the maximum essential oil content in treatment of 10 t/ha manure and application of biosuperphosphat and the highest geranyl acetate percent in essential oil in treatment of 20 t/ha manure and application of biosuperphosphat were obtained.