Influência de extratos vegetais de eucalipto e guanxuma sobre a germinação de sementes de jabuticaba, pitanga e goiaba

Abstract

This study aims to analyze the possible allelopathic effects of aqueous extract of eucalyptus leaves (Eucalyptus sp.) And prickly sida (Sida rhombifolia L.) on germination of seeds jabuticaba (Plinia cauliflora L.), cherry (Eugenia uniflora L.) and guava (Psidium guajava L.). The extract was obtained by grinding the dried leaves in a blender with the addition of water, constituting the 20% extract (crude extract). From this crude extract different concentrations were formulated and these are: 0.25; 0.50; 1.0ml and the witness. The seeds and leaves to achieve the germination and speed of germination tests were collected around the city of Cerro Largo - RS. The evaluations were performed daily, and from this record was obtained variables germination percentage (% G) and germination speed index (GSI). The variables were subjected to analysis of variance and the treatments compared by mean comparison test (Tukey test) at 5% probability using the software SISVAR the Federal University of Lavras. According to the results obtained in testing the eucalyptus extract reduced the germination percentage and germination speed index of jabuticaba and guava. However the application of sida extract showed higher percentage of germination of guava seeds, and reduced the germination speed index of cherry and blemish.