Abstract
Previous research has shown that there are allelopathic interactions between plants, releasing
allelochemicals for which it is still unknown whether they are randomly generated or transmitted from
generation to generation. In this paper, the influence dried ragweed leaves (Ambrosia artemisiifolia L.)
aqueous extract of different concentrations: concentrated extract (10%), extract diluted to 1/2 (5%); 1/4
(2.5%) and 1/8 (1.25%) on germination and growth of peas and beans was monitored. The results showed
that the increased concentration of ragweed extract inhibited germination, prolonged germination time and
decreased the germination index of both test plant species compared to the control. The ragweed extract
(concentrated and 1/2) reduced the growth of shoots and roots compared to the control (by more than 50%),
with the inhibitory effect being more visible on young pea plants compared to beans. The results of the
research showed that the presence of ragweed as a weed in the field significantly reduces the germination
and growth of cultivated plants, which is why care should be taken to suppress and remove it in a timely
manner.
