Efeitos de extrato de eucalyptus sp. sobre sementes de forrageiras

Abstract

The allelopathy characterized for the damaging effects or beneficial that second metabolites produced by plants, microorganisms or released fungi in the environment exert over the development of the natural biological systems or implanted. The present work had the objetive of testing the allelopathic potential of the Eucalyptus sp. leaves extract on germination and vigour of the forages seedlings as oat (Avena strigosa Schreb), vetch (Vicia sativa), sudan grass (sorghum sudanense), millet (Pennisetum americanum) and brachiaria (Brachiária Brizantha). Two aqueous extracts of Eucalyptus E. grandis and E.citriodora species were tested in the following concentrations (0, 3, 10%) of each specie, where there is concentration 0% and the witness (distilled water). After the experiment, showed up allelopathic potential on the germination of Brachiaria forage, already in the other forages the main negative result it is on germination speed. This way it was found that extracts of the genus Eucalypitus grandis and citriodora can act in the negative way in certains forages, during the germation as in the development.