Superação de dormência e vigor em sementes de Fava-d’Anta ( Dimorphandra gardneriana Tulasne)

The objective of this study was to evaluate the effciency of different methods of overcoming of dormancy in Dimorphandra gardneriana  Tulasne seeds, aiming to provide technical and scientifc knowledge to enable the creation of a protocol for germination. In an experiment conducted at ‘Laboratorio de Analise de Sementes’, Centro de Ciencias Agrarias, Universidade Federal da Paraiba (CCA-UFPB), in a completely randomized experimental design, seeds of fava d’anta were subjected to the following treatments: control consisting of non-carifed seeds mechanically scarifed with sandpaper No 120, mechanically scarifed seeds with sandpaper and soaked in distilled water for 6, 12, 18 and 24 hours, seeds subjected to blunt the region opposite to the hilum of nail with pliers, seeds subjected to blunt the region opposite to the hilum of nail with pliers and put on immersion in water distilled for 6, 12, 18 and 24 hours, chemical scarifcation with concentrated sulfuric acid for 5, 10 and 15 minutes. After the treatments, the seeds were tested for germination and vigor (emergence, speed of germination and emergence, length and dry weight of roots and hypocotyl). Mechanical scarifcation with sandpaper and lopping followed by immersion in distilled water for six hours favor the percentage of seed germination and the seedling emergence of Dimorphandra gardneriana and treatments using sulfuric acid dramatically reduced the strength of these seeds.