Allelopathic activity and chemical composition of rapeseed extracts on Jungle rice

Jungle rice is one of the most serious grass weeds of maize in Egypt. Laboratory experiments were conducted to evaluate the allelopathic effects of extracts of rapeseed on the germination and seedling growth of jungle rice (Echiochloa colona). The inhibitory effect of rapeseed extracts on plant growth, using jungle rice as a bioassay material was investigated to test different variants of biological activity of rapeseed aerial parts, five extracts; in three solvents methanol, chloroform and water extraction respectively.Analysis of chemical composition of methanolic extract of rapeseed aerial parts using HPLC. chloroformic extract induced slight inhibition of the growth, whereas methanolic extracts .