Efeitos alelopáticos da Arruda (ruta graveolens) sobre a trapoeraba (commelina benghalensis)

Abstract

Due to the resistance increase of weeds to the herbicides in the current market and also the improper use, Brazil ends up being one of the most consuming countries of those products in the world, being this harmful to the environment and causing intense environmental impacts. These facts make allelopathy an effective alternative that intent to reduce damages to the environment. This study aimedobserving the allelopathic effect of rue (Ruta graveolens) on trapoeraba weeds (Commelina benghalensis). The experiment was carried out in the botany laboratory of Centro Universitário de Maringá – UNICESUMAR. The extract was extracted from the rue leaves, which according to researches carried out, it contains substances with allelopathic effects. The treatments were characterized as T1-0% control, T2-25%, T3-50%, T4-75%, and T5-100% of the extract obtained in the seeds of the trapoeraba weeds, where germination, length of seedlings and fresh weight mass were evaluated. The experimental design was completely randomized with five replications totaling twenty five plots which they were composed of fifty trapoeraba seeds evenly arranged in the gerboxes. The data were evaluated by analysis of variance and the average among treatments compared by Scott Knott test at 5% of significance. It was concluded that the rue can be used as a herbicide for trapoeraba seeds as it showed very efficiently the interference under the germination of the studied plant and in each concentration we obtained the respective percentages of germination. T1-6.00%, T2-3.20%, T3-1.46%, T4-0%, and T5-0%.