This study was carried out aiming at determining the most efficient methodology to overcome dormancy in Myracrodruon urundeuva seeds. The 16 treatments employed were: control - intact seeds (T1); mechanical scarification with sandpaper for 3, 6 and 9 minutes (T2, T3 and T4, respectively), immersion in sulfuric acid pondered for 2, 4, 6, 8, 10 and 12 minutes (T5, T6, T7, T8, T9 and T10, respectively), mechanical scarification with sandpaper of water number. 80, for 3, 6 and 9 minutes, followed by immersion in water at room temperature during 24 hours (T11, T12 and T13, respectively) and mechanical scarification with sandpaper of water number. 80, for 3, 6 and 9 minutes followed by immersion in solution of potassium nitrate (KNO3) at room temperature during 24 hours (T14, T15 and T16, respectively). The effects were appraised through emergency and of vigor tests (percentile of emergency, first count and index of emergency speed, length and mass evaporates of the seedlings). It was used a completely randomized experimental design with four replicates of 25 seeds and the averages were compared through the Scott - Knott test. The treatments that involvd water and KNO3 soaking were notsatisfactory to overcome the dormancy of seeds of M. urundeuva . There were significant differences among the treatments for all variables and the most efficient treatment to overcome dormancy was the immersion in sulfuric acid for 12 minutes.
emergence; dormancy; forest seeds; medicinal plant
