Effect of bio-fertilizers and Salicylic acid on growth, Essential oil Yeid and N, P, K of Rosemary under irrigation regimes

In order to study the effects of Salicylic acid levels and bio-fertilizers on growth characteristics, essential oil yield and elements concentration of Rosmarinus officinalis, an experiment was conducted as factorial based on randomized complete block design with three replications at research farm of Gorgan University of Agricultural Sciences and Natural Resources, during growing season of 2015- 16. The treatments were Salicylic acid including three levels: (0, 5 and 10 mlg/l), two concentrations of bio-fertilizers (nitroxin, biophosphor) and four levels of irrigation regimes: (40, 60, 80 and 100 percent FC). The results showed that irrigation regimes had significant effect on shoot height, wet and dry weight, number of shoot, essential oil yield and N and P. Salicylicacid with 10 mlg/l had significant effect on all of traits and this effect was increased of salicylicacid. Nitroxin increased all of the traits except of P and salicylicacid was caused to decrease negative effects of low irrigation regimes. The highest of shoot height, plant wet and dry weight, shoot number, nitrogen and essential oil yield were obtained with nitroxin and 100percent FC irrigation regime and highest of essential oil yield and P were observed in 40percent FC irrigation regime. Also the highest of P was obtained with biophosphor and 100percent FC irrigation regimes. The results of this research shows that use of bio-fertilizers and salicylicacid will be useful for reducing drought stress.