Effective Factors on Seed Dormancy and Germination of Two Annual Medics

The objective of the present study was to investigate effective methods in breaking the seed dormancy for two annual medics’ species. Three experiments were conducted to evaluate seed germination of two annual medics including Medicago polymorpha and Medicago rigidula under different prechilling, gibberellic acid and potassium nitrate concentrations and sulfuric acid concentrations in 5 and 10 minutes of applying time. The result showed that all methods broke seed dormancy and exhibited seed germination of annual medics, but some cases were different in species. The most effective and practical method for seed dormancy breaking in M. polymorpha and rigidula was %96 sulfuric acid application for 10 minutes. The main advantages of this method are speed, ease of use, and unaltered physical condition of the seeds following treatment and cheap.