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Studies on Lippia sidoides show that this species possesses allelopathic potential on weeds, mainly on nutsedge. In this work, we evaluated the effects of the concentration of aqueous extracts of Lippia sidoides on the development of nutsedge tubercles. The treatments consisted of the application of Lippia sidoides aqueous extracts at the concentrations of 0, 10, 20, 30, 40, 50, 60 and 70% in the transparent plastic boxes containing coarse washed sand and 10 healthy nutsedge tubercles distributed evenly within the container. Increased doses of Lippia sidoides extract caused reduction of the emergence percentage and the emergence speed index of the nutsedge plantlets analyzed, as well as inhibition of their development. At higher concentrations, the use of extracts resulted in a higher number of non-emerging tubercles and tubercles presenting advanced deterioration. The maximum effect was obtained with 50% concentration of Lippia sidoides extract, which reduced the length and vigor of nutsedge plantlets.

Extrato aquoso de alecrim-pimenta no manejo da tiririca