Investigation the effects of different levels of gibberellic and salicylic acid on improvement of germination indices of Festuca arundinacea under stress with allelopathic compound

The aim of this study was to investigate the allelopathic effects of Eucalyptus camaldulensis on germination and early seedling growth of Festuca arundinacea under laboratory condition in order to determine the effect of pretreatments on decreasing the destructive effects of allelopathic compounds. The chemical stimulators used in this study included 3 levels of gibberellic acid، 3 levels of salicylic acid and 5 levels of allelopathic compounds of Eucalyptus camaldulensis. Factorial test in the completely randomized design with four treatments was used to analyse the data. Results indicated that Eucalyptus camaldulensis extract had inhibitive effect on germination and early seedling growth of Festuca arundinacea. Early seedling growth of Festuca arundinacea increased by pretreatment of seeds in chemical stimulators. Interaction effects of allelopathic and pretreatment with chemical stimulators were significance on germination percentage and speed، root، shoot and plant length and seed vigor index.