Medicinal plants usually release many kinds of secondary metabolites that could be used for weed management based on organic principles. In order to evaluate germination characteristics and preliminary growth of lambsquarters (Chenolodium album L.) affected by aqueous extracts of galbanum (Ferula gummosa Bioss.) shoot and root tissues, an experiment was conducted based on completely randomized design with four replications at the Special Crop laboratory, College of Agriculture, Ferdowsi University of Mashhad, during year of 2010. Treatments were five concentrations of aqueous extracts for galbanum shoot and root such as zero, 5, 10, 20 and 40%. The results showed that the allelopathic effects of galbanum different tissues were significant (p≤0.01) on final germination (FG), germination rate (GR), time to 50% germination and radicle and plumule lengths of lambsquarters. By increasing in concentration of aqueous extract FG, GR and radicle and plumule lengths decreased and time to 50% germination enhanced. With increasing in aqueous extract concentration from zero to 40% decreased FG and GR for lambsquarters up to 100%. Also, allelopathic effects for decreasing in lambsquarters germination were higher for root than shoot of galbanum. So, it concluded that the allelopathic traits of galbanum could be considered as an ecological approach for weed management based on organic agriculture.

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