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Effect of aquatic and hydro-alcoholic extracts of some medicinal plants on after germination stages of Rumex cirspus L.
Use of natural and safe components in organic agriculture is increasing currently. In this context, the use of plant extracts as natural materials is a new idea for management of weeds. For this purpose the allelopathic effects of aqueous and hydroalcoholic extracts of Teucrium polium, thyme (Thymus kostchyanus) and watercress (Nasturtium officinalis) was evaluated on Rumex cirspus L. at the vegetative stage (post emergence). The effects of extracts were evaluated on plant roots and leave of plants. Plants root treated by hydro-alcoholic extracts cause to increase plant dejection after 24h maintaining in distilled water. At this stage plant treated by watercress hydro-alcoholic and Teucrium polium water extract had high dejection effect and low dejection was observed in plants treated by control. Only aquatic watercress extracts treated on leave have shown burning effects. It seems that inhibitory effects on root of plants to be due to active ingredients in medicinal plants, Teucrium polium and Nasturtium officinalis. Our experiment have shown that some of medicinal plant could be as a useful natural herbicides, However future studies are necessary to fully understand the reasons by which medicinal plants extract may affect as herbicide in order to commercial application.
Keywords: allelopathy, aquatic extract, hydro-alcoholic extract, Thymus kostchyanus, Nasturtium officinalis, Rumex cirspus L