Allelopathic Effect of Essential Oil of Sweet Bay (Laurus nobilis L.) on Germination and Seedling Vigor of Velvetleaf (Abutilon theopharasti L.) and Field Bindweed (Convolvulus arvensis L.)

Subject Areas : Journal of Crop Ecophysiology

Bahram  Mirshekari ¹ (Associate Prof., Department of Agronomy and Plant Breeding, Tabriz Branch, Islamic Azad University, Tabriz, Iran)

Received: 2014-04-09 Accepted : 2016-03-09 Published : 2016-06-21

Keywords: Regression, Germination percentage, seedling vigor index, Essence concentration, Sweet bay (Laurus nobilis),

Abstract :

To study allelopatic effect of sweet bay essence concentrations (0, 100, 200, 300 and 400 ppm) on germination and early establishment of velvetleaf and field bindweed an experiment was conducted at Islamic Azad University of Tabriz, Iran, during 2013. Results indicated that germination percentage of non-treated seeds was 73.3%, and that of treated seeds 64.7%. Plant height at 400 ppm concentration was shorter than other treatments. Mean leaf area per plant of weeds ranged from 13.5 cm2 in control up to 9.7 cm2 in 300 ppm and 400 ppm concertrations. Dry weight per weed plant of the seeds treated with 300 and 400 ppm concentrations was twice lower than of untreated seeds. Vigor index of seedling from seeds treated with 100 and 200 ppm essence and control were 1.5, 1.5 and 2.6 times higher than those treated with 300-400 ppm, respectively. Regression analysis showed that germination percentage, leaf area and dry weight per plant did have higher effect on seedling vigor index. It can be concluded that essential oil of sweet-bay may have potential in controlling weeds, especially in the higher concentrations. Therefor, it could be used in the synthesis of bioherbicides compounds to control weeds.

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