رشد گیاهچه های خرفه و تاج خروس تحت تاثیر دگرآسیبی عصاره آبی رازیانه

Allelopaty may be hired as a sustainable approch for weed control in the field.One of the most appropriate alternatives to herbicides is to apply environment friendly substances.The first step is to assey different plant species.Fennel is a medicinal plant with allelochemical properties wich has a long history of production both in Iran and in the world.In this experiment aquous extraction was used to examine the allelochomical potential of 10 fennel genotypes (Isfahan , Abnecina , Kerman , Shiraz , Mashhad , Yazd , Ardebil , Hamedan and Bushehr) on two noxios weeds amaranthus retroflexus and Portulaca oleraceus .Seeling traites of the above weed species including radicle and plumule lengthes radicale and plumule fresh masses ,plumule dry mass ,and germination percent and velocity rate of germination were meascrred .Results revealed that the allelochemical capacity of fennal genotypes dependent .Genotype "mashhad" was proven to be the most allelopatic genotype , according to its effect on radicale fresh mass, germination percent and velocity.Genotype "Hamedan " was found to leave minimal allelopatic effects on the radicale length and seed germination percant and velocity germination of the two weedy species.