Fig. (1) Mean germination parameters as affected by seed pre-treatments for Crotalaria persica (solid bars) and Thephrosia apollinea (open bars). CHIP, chipping seed; DW, distilled water; SAND, rubbing with sand; SP, rubbing with sand-paper; SOAK, soaking; SA20 to SA90, sulfuric acid exposure during 20 to 90 minutes). Data presented are mean ± SEM.