Inhibitory effect of ragweed (Ambrosia artemisiifolia L)-inflorescence extract on the germination of Amaranthus hypochondriacus L and growth of two soil algae.

In this study the ecological importance of common ragweed (Ambrosia artemisiifolia L.; Asteraceae) was investigated in in vitro bioassays as it is one of the most widespread annual weeds occurring on arable land in Hungary. Eight fractions were derived from ragweed inflorescence water extract by low vacuum column chromatography and their biological activity was investigated by Amaranthus hypochondriacus L.