Studies on herbicidal activities of four solvent extracts from the root of Cichorium intybus L.

In order to study the herbicidal activity of root extracts of chicory(Cichorium intybus L.),the herbicidal activities of three solvent extracts from chicory root were tested on Trifolium repens L.,Lolium perenne L,C.intybus,and Abutilon theophrasti Medic.using seed germination method.The results show that ethanol extract had the highest herbicidal activity on the three species except T.repens,acetate extract the second place,and petroleum ether extract the lowest one to the four species.The sensitivities of seedling roots and tillers of the four species were different to the same extract.Tiller and root of A.theophrasti seedling were very sensitive to ethanol extract and the inhibition rates were 99.51% and 98.09%,respectively,when treated with 2.5 g·L-1 ethanol extract.