Allelopathic inhibition of seed germination and seedling growth of radish( Raphanus sativus )treated with white clover( Trifolium repens )and tall fescue( Festuca arundinacea )extracts were studied.The difference of allelopathic potential among species and variety and the mechanism of the allelopathy of white clover and tall fescue were preliminarily discussed.The results indicated that extracts from all varieties significantly inhibited seed germination and seedling growth of radish.Allelopathic inhi...