H. Delavar; M.J. Saharkhiz; N. Kazerani
Abstract
This investigation was conducted to determine the essential oil composition and allopathic properties of anghuzeh (Ferula assa-foetida L.) medicinal plant. The experiment was completely randomized design in a factorial arrangement with two factors and three replications. The factors were six concentrations ...
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This investigation was conducted to determine the essential oil composition and allopathic properties of anghuzeh (Ferula assa-foetida L.) medicinal plant. The experiment was completely randomized design in a factorial arrangement with two factors and three replications. The factors were six concentrations of 0, 200, 400, 600, 800 and 1000 ppm of the essential oil and five plant species including three weed species, Sinapis arvensis, Acroptilo repens, and Cardaria draba as well as two crops i.e. Triticum aestivum and Hordeum vulgare. The essential oil used in this study was extracted by hydro-distillation from the latex of the plant. The obtained oil was analyzed by Gas chromatography (GC) and Gas chromatography–mass spectrometry (GC-MS).To assess the allopathic effects of the oil on the studied species, a number of growth parameters such as seed germination, radical and plumule length as well as their dry and fresh weight, and abnormality percent of the seedlings were evaluated. The results of this investigation showed that the Anghuzeh essential oil had significant (p ≤ 0.05) allelopathic effect on the studied weeds and crops. The comparisons among the means indicated that the response of the species to the oil were quite different. For example, Triticum aestivum showed maximum germination percent in the presence of different oil concentrations. While, the germination of Hordeum vulgare, Acroptilon repens, and Cardaria draba showed more susceptibility to the oil. Moreover, the results of the essential oil analysis indicated that a total of 13 components were identified in the oil of which α-Pinene (21.3%), β- Pinene, (47.1%) and 1,2-Dithiolane (18.6%) were the major compounds. The observed allelopathic effects of the essential oil are regarded to oil components and their synergistic effects. The findings of this study are the first step to use of Anghuzeh essential oil as a natural herbicide. Further investigations are still required for practical and commercial application of this method.
M. Makkizadeh Tafti; R. Farhoudi; M. Rabiee; M. Rasifar
Abstract
Nowadays, in response to the consequences of herbicide application and gradual reduction of farm crops, suitable biological methods have been identified to control the weeds. This research was conducted to evaluate the allelopathic effect of harmel (Peganum Harmala L.) on seed germination of oat (Avena ...
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Nowadays, in response to the consequences of herbicide application and gradual reduction of farm crops, suitable biological methods have been identified to control the weeds. This research was conducted to evaluate the allelopathic effect of harmel (Peganum Harmala L.) on seed germination of oat (Avena fatua L.), fat hen (Chenopodium album L.) and pig weed (Amaranthus retroflexus L.) in laboratory and greenhouse conditions using hydroalcoholic extracts of harmel dried fruit powder. The treatments were 0.1, 0.25, 0.5, 1, 2.5 and 5% extract of harmel and distilled water (control). Laboratory results indicated that germination percentage and radicle and plumule lengths of weed species were significantly reduced by different harmel extracts in comparison with control. According to the results of greenhouse experiments, germination percentage, fresh and dry weight and height of weed species were significantly reduced by using hydroalcoholic extracts. Greenhouse results also showed that seed germination percentage of Chenopodium album, Amaranthus retroflexus and Avena fatua at concentration of 1% was reduced 60%, 50% and 40% respectively in comparison with control. Our results showed that harmel extract had strong allelopathic effects and inhibited seed germination of weeds recommended in production of natural herbicides.
M. Makkizadeh Tafti; M. Salimi; R. Farhoudi
Volume 24, Issue 4 , February 2009, , Pages 463-471
Abstract
The allelopathic effects of rue (Ruta graveolens L.) were evaluated on seed germination of velvet flower (Amaranthus retroflexus), flixweed (Descurainia Sophia) and purslane (Portulaca oleracea) in laboratory using the aqueous extracts of dried powdered of rue leaves. The treatments were 0.5, 1, 2.5, ...
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The allelopathic effects of rue (Ruta graveolens L.) were evaluated on seed germination of velvet flower (Amaranthus retroflexus), flixweed (Descurainia Sophia) and purslane (Portulaca oleracea) in laboratory using the aqueous extracts of dried powdered of rue leaves. The treatments were 0.5, 1, 2.5, 5, 10 and 15% extract of Ruta graveolens and distilled water (control). According to the results, extracts significantly inhibited seed germination of weed species and the degree of inhibition increased with increasing concentration of extracts. Germination of Amaranthus retroflexus seeds was inhibited at concentrations greater than 5%. In addition, radicle and plumule lengths of Amaranthus retroflexus were significantly reduced at 1% compared to the distilled water. Results indicated germination percentage, germination rate and radicle and plumule lengths of Portulaca oleracea were significantly reduced by the extracts compared to the distilled water. Results confirmgermination of Descurainia sophia seeds was inhibited at concentrations greater than 2.5%. Accordingly germination rate and radicle lengths of Descurainia sophia were significantly reduced by the extracts compared to the distilled water. Therefore, extract of rue might be useful as natural herbicides and might also contain numerous growth inhibitors that could be used for the development of biological herbicides.
A. Najafi Ashtiani; M.H. Assareh; M.A. Baghestani; S.J. Angaji
Volume 24, Issue 3 , November 2008, , Pages 293-303
Abstract
This research was carried out under laboratory conditions in 2007 at Research Institute of Forests and Rangelands. Experiments were done by randomized completely block design with 4 replications. The results showed different levels of E. camaldulensis Dehnh. leaf extracts in winter and spring had significant ...
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This research was carried out under laboratory conditions in 2007 at Research Institute of Forests and Rangelands. Experiments were done by randomized completely block design with 4 replications. The results showed different levels of E. camaldulensis Dehnh. leaf extracts in winter and spring had significant effects on plant length, germination percentage, germination speed, seed vigor, shoot/root rate, seminal root (α =0/01) of Chenopodium album L. Comparison between treatments showed that using 9 gli-1 of both Eucalyptus extract had maximum inhibitor on characteristics of weeds. Comparison effect of winter and spring extracts leaves on morphological characteristics of weeds showed that spring extract had high effect compared with winter extract. The results of this research showed that using of Eucalyptus leaf extract can control the weed growth of Chenopodium album.
