A study on the allelopathic activity and quantitative determination of total phenolicand flavonoid of six plants in the Asteraceae family

This study aims to determine the allelopathic activities of six plants that belong Asteraceae family such as China wedelia (Wedelia chinensis), sunflower (Helianthus annuus), cosmos (Cosmos bipinnatus), marigolds (Tagetes erecta), Mexico (Tithonia diversifolia), and zinnia (Zinnia elegans) by applying their methanolic extracts on barnyardgrass (Echinochloa crus-galli L.) mustard green (Brassica juncea) with different concentrations (0.03, 0.1, 0.3, 1 g/ml). Results conducted from showed aqueous solutions extracted above-mentioned inhibited shoot root length barnyardgrass, at intensity ranges in which extract gave strongest impact, says, 23.01 97.54% inhibition; 56.45 93.52% inhibition 0.3 1.0 g/ml respectively for green. In case barnyradgrass, same results were also reported, 8.5 88.15% 36.35 99.99% respectively. Total phenolic contents fresh cosmos, wedelia, sunflower, zinia 4.51, 3.96, 1.05, 1.45, 3.61, 0.99 mg/g, respectively; total flavonoid 1.58, 0.76, 0.29, 0.39, 0.65, 0.45 It is obvious can be effectively safely used biological control barnyardgrass.