Abstract
Allelopathic activity of thirty upland weeds of Taiwan was determined using aqueous extracts of the weeds. Germination and seedling growth of lettuce (Lactuca sativa) ere completely inhibited by 10%(w/v) aqueous extracts of Ageratum houstonianun, Alopecurus aequalis var. amurensis, Amaranthus viridis. Ageratum conyzoides, Cardamine parviflora, Erechtites valerianafolia, Gnaphalium affine, Leptochloa chinesis, Rorippa cantoniensis, Soliva anthemifolia or Stellaria aquetice. Aqueous extracts of Amaranthus viridis, Ageratum conyzoides, Soliva anthemifolia or Stellaria aquatica at 1%(w/v) level resulted in more than 70% inhibition of radicle growth of lettuce. Radicle growth of sorghum (Sorghum bicolor) were less affected by aqueous extracts at 1%(w/v) level. Phytotoxicity severally increased with raising concentration of the extracts obtained from all 30 weeds tested. Osmotic pressure and pH in the range that of the extracts did not affect germination and radicle growth of lettuce. Litter of Amaranthus viridis, at 1.2%(w/w) level significantly inhibited germination and seedling growth of lettuce and rice (Oryza satuva) in pot test.
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