The crude extracts from the stems of red spragle (Leptochloa chinensis) were extracted by ethyl acetate and used at six concentrations (0 0.5 1.0 1.5 2.0 and 2.5 g/L). The six concentrations of red spragle crude extracts were tested on the inhibitory on seed germination and seedling growth of seven tested plants (popping pod (Ruellia tuberosa, chinese cabbage (Brassica chinensis), chinese kale (Brassica oleracea), barnyard grass (Echinochloa crus-galli), amaranthus (Amaranthus viridis), weedy rice (Oryza sativa) and waxy corn (Zea mays). Inhibitory of five characteristics (seed germination, shoot length, root length, seedling fresh weight and seedling dry weight) were recorded. The results revealed that all crude extracts of red spragle (0.5 1.0 1.5 2.0 and 2.5 g/L concentrations) inhibited seed germination and seedling growth of seven tested plants for 9-100% inhibition. whereas, the red spragle crude extracts at 2.5 g/L concentration showed the completely excellent of inhibition (100% inhibition) of seed germination and seedling growth in term of shoot length, root length, seedling fresh weight and seedling dry weight characteristics against four tested plants (popping pod, chinese cabbage, chinese kale and amaranthus). The increasing of concentration of red spragle crude extracts showed increased of inhibition of seed germination and seedling growth in seven tested plants. This result displayed the herbicidal potential of red spragle (L. chinensis) against seven tested plants as well as suggested that the utilized of the crude extracts from the stem of red spragle (L. chinensis) as bioherbicides application in order to weed control.
Herbicidal Potential, Crude Extracts, Red Spragle, Leptochloa Chinensis, Seed Germination, Seedling Growth, Allelopathic Activity
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