اثر عصاره اندام های رویشی برخی از علف های هرز بر جوانه زنی و رشد گیاهچه سوروف (Echinochloa crus-galli)

In order to investigate the inhibitory potential of five weeds foliar liquid extracts on barnyardgrass germination and seedling parameters, an experiment was conducted in factorial arrangement in a completely randomized design in laboratory of agronomy department of University of Guilan. Our selected weeds consist of barnyardgrass, Bermudagrass (Cynodon dactylon), Purple nutsedge (Cyperus rotundus), Knotgrass (Paspalum distichum) and Water plantain (Alisma plantago aquatic) with 0, 50 and 100 percent of aqueous extracts concentrations. The results showed a significant differences among aqueous extracts concentrations, and the highest inhibitory effects was found in %100 concentration. Aqueous extracts showed inhibitory activity in terms of root and shoot growth of barnyardgrass and water plantain showed the least root length, that didn’t have significant different with barnyardgrass, but knotgrass showed high root length. Corresponding effect of weeds on extract concentration for shoot and seedling length and vigor index was significantly differences, and the %0 concentration had the least inhibitory effect, but barnyardgrass with %100 concentration showed high inhibitory effect. Generally, the results showed that aqueous extracts of barnyardgrass have highly inhibitory effect on germination and seedling growth of itself. Root elongation was sensitive to aqueous extracts concentrations rather than shoot elongation.