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In Romania, wheat is the main crop, occupying the largest area of arable land. Convolvulus arvensis is a competitive and invasive weed, produces direct and indirect damages to which is added production of allopathic substances. Allelopathy is a natural phenomenon which refers to any direct or indirect effect, positive or negative of a plant (including microorganisms) on the other by the release of chemical compounds in the environment [13]. In most cases, influence is inhibitory, which may explain why some plants ...