Pre-Germinative Treatments to Overcoming of Seed Dormancy in Sterculia Alata (ROXB) Clompanus Alata (ROXB) Kuntze

The aims of this study to evaluate method for breaking dormancy of seeds Sterculia alata (Roxb) which was subjected to the following treatments for physical and physiological dormancy. 1) Hot water treatment 24 hrs. and 36 hrs 2) H₂SO₄ for 1% and 2% for 10 min. KNO₃ 1% and 2% for 10 min Thiourea 1% & 2% for 10 min KNO₃ 1%& 2% for 10 min GA₃ 250 ppm, 500 ppm & 750 ppm mechanical scarification by sand paper technique for 3 min. The result showed that the treatment with hot water sulfuric acid and mechanical scarification gave significant results and germination percentage enhanced significantly. The treatment with H2So4, GA₃, Thiourea and KNO₃ at different concentration also break the dormancy of seed and percentage of germination enhanced significantly. Thus it is necessary to use techniques to make the breaking dormancy of seeds of Sterculia alata(Roxb).