Seed dormancy and germination of button medic (Medicago orbicularis (L.) Bart.) lines

This study was conducted to re-germinate of button medic (Medicago orbicularis (L.) Bart. lines in which seed dormancy is common at the Akdeniz University Faculty of Agriculture Department of Field Crops in 2018. To damage the seed shell on small level physical and chemical methods were applied to the seeds displaying seed dormancy. In this experiment; control, sanding (1, 2 and 3 minutes), standing in water at 25°C (6, 24 and 48 hours), standing at 70°C in hot water (5, 15 and 20 minutes), freezing and then keeping in the refrigerator (2 hours-5days and 4 hours-10 days), destruction with a mixture of sand + iron shavings (1, 2 and 3 minutes), sulfuric acid (70%) solution in holding (30, 50 and 70 minutes), sanding (1 minutes) and afterrwards staining in sodium hypochlorite (4, 8 and 10 minutes) were used as applied methods. The experiment was carried out under laboratory conditions using by split plot design with 3 replications, In the experimental plan lines formed the main parcels and the applications have performed the sub-parcels. Characteristics like germination rate (%), germination index, average germination time (day), root length (mm), shoot length (mm), fresh root weight (mg/plant) and fresh shoot weight (mg/plant) properties were examined on the plants. As a result of the experiment, generally sanding (2 minute) and sanding (1 minute) + sodium hypochlorite resting (4 minute) were found to be effective. Damage to the seed shell by physical or chemical means has provided a germination-facilitating effect. The main reason for this is that the seed crust becomes a permeable layer. The lines reacted differently to the applications. This has shown that the lines are at different levels of dormancy.