Abstract
The objective of this work was to determine the efficience of pre-germinative treatments in dormant seed of Caesalpinea ferrea Mart. ex Tul. var. leiostachya Benth., Cassia grandis L. and Samanea saman Merrill. Mechanical and chemical scarification processes were studied. Intact seeds as control; mecanical scarification; thermal scarification (immersion in: water at 25°C for 48 hours, boiled water for 30 and 60 segunds and boiled water to environmental temperature), chemical escarification (adition of H 2 O 2 in the substrate, immersion in: H 2 O 2 for five minutes and in sulphuric acid for 05, 10, 15, 20 and 60 minutes) were placed to germinate. The mechanical and chemical scarification to sulphuric acid between five and 60 minutes was the treatments most effective to overcome seed dormancy for the three species.
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