Investigation the allelopatic effects of aqueous extracts of sunflower on germination and catalase enzyme activity in canola (Bracica napus), wild mustard (Sinapis arvensis) and mallva common (Malva sylvestris)

Experiment was carried out to evolution the allopathic effects of sunflower aqueous extracts on germination and catalase enzyme activity in canola، wild mustard and mallow. The experimental arrangement was factorial included 4 level of aqueous extract concentration (0، 20، 40 and 60 volum percent) and 3 level of plants (canola، wild mustard and mallow) in 4 replications. Results showed Increasing the concentration of sunflower extracts، decreased seed germination percentage in canola and wild mustard but did not affect in mallow. Increasing sunflowe aqueous extracts of significantly decreased seedling weight، shoot and root length in canola and wild mustard but decreased catalase enzyme activity in musturd.