مقايسه آزمون هاي تراوش پتاسيم و هدايت الكتريكي در ارزيابي بنيه بذر يونجه

Comparison of potassium leachate and electrical conducitvity tests in alfalfa seed vigor evaluation

In order to investigate potssium leachate test for evaluation alfalfa (Medicago sativa L.) seed vigor, seeds of four cultivars: Hamedani, Yazdi, Maopa and Garayonge were kept for 0, 2, 3 and 4 days in accelerated aging conditions with 41°C temperature and %100 relative humidity. Then germination percentage and seedling length was measured in standard germination test .Afterwards one gram seeds of each cultivar in various aging treatments were soaked in 50 ml distilled water for 60, 90 and 120 minutes. Then the amount of electricl condutivity and potassium were measured and results were compared with germination percentage and seedling length. Results showed that each accelerated aging treatments can be used for distinguish differences between of alfalfa cultivars seed vigors. Also results of potassium leachate test as well as electrical condutivity test in imbibition priods used in this expriment can be used for ranking alfalfa seed vigor. On the basis of results, 60 minutes imbibition were sufficient for these tests. If the results of this experiment will confirmed with field experiments,both electrical conductivity and potassium leachate tests after 60 minutes seed imbibition will the fastest methodes for evaluation alfalfa seeds viability and vigor.