Učinkovito suzbijanje korovne vrste Ambrosia artemisiifolia L. zahtjeva razumijevanje okolišnih čimbenika koji utječu na njen vegetativan i generativan rast i razvoj. Hipoteza ovog istraživanja je pretpostavka da na ponašanje ove korovne vrste utječu biotički i abiotički čimbenici. Odabir lokaliteta u prvoj godini istraživanja zahtijevao je visoku gustoću zakorovljenosti ambrozijom te mogućnost neuznemiravanja pokusa naredne dvije godine. Postavljanje pokusa uključivalo je označavanje stalnih mjernih mjesta na kojima su se tijekom tri godine utvrđivala vegetativna, generativna te fenološka svojstva ambrozije. Rezultati istraživanja ukazuju da su volumen biljaka, broj ţenskih i muških cvatova te potencijalna produkcija sjemena i polena po m2 varirali značajno tijekom istraživanih godina. Od svih okolišnih čimbenika, interkompeticijom je najbolje objašnjena redukcija vegetativnih i generativnih svojstava ambrozije.

Effective long-term suppression of the weed species Ambrosia artemisiifolia L. requires an understanding of the environmental factors affecting it is vegetative and generative growth. The hypothesis of this study is the assumption that the behavior of this weed species is influenced by biotic and abiotic factors. The selection of locality in the first year of research required a high density of common ragweed and the possibility of non-cultivation (untreated) experiments over the next two years. The placement of the experiment included the marking of permanent metrics where during three years vegetative, generative and phenology parameters were measured. The volume of plants, the number of female and male reproductive structure, and the potential production of seeds and pollen per unit area varied significantly in all investigated years. Of all of the environmental factors, intercompetition was best explained by the reduction of the vegetative (volume) and generative properties (female and male flowers) of the common ragweed.