Studies on herbicidal activities of four solvent extracts from Xanthium sibiricum

The herbicidal activities of four solvent extracts from Xanthium sibiricum Patrin were tested by method of seed germination for Sorghum vulgare Pers.,Cucumis sativus L.,Triticum aestivum L.and Brassica campestris L.The results showed that acetone extract had the highest herbicidal activity,then petroleum and ethyl acetate extracts,benzene extract was the lowest one.The sensitivities of roots and stems of the four crop seedlings were different on the same extract.Roots of Brassica campestris and Sorghum vulgare seedlings were very sensitive to acetone extract of X.sibiricum,and their inhibition rates were 90.7% and 92.1% respectively treated with 5 g·L-1 acetone extract.