Medicago scutellata and Medicago polymorpha are two species of annual medics. These are two annual forage legumes very interesting for grazing of live stocks. The germination abilities of these annual legume species were tested under three dormancy breaking treatments: mechanical treatment was performed by hand scarification with sandpaper. For physical treatment used hot water, precooling and surface run off.Chemical treatment by sodium hypochlorite was used for breaking the dormancy. The complete and sharp germination achieved by mechanical scarification with sandpaper that determined dormancy originating by seedcoat (hardseededness). Soaking in hot water was very useful physical method, but M. scutellata seed coat was thicker than to remove by this method. Low temperature by keeping in refrigerator was also effective in final germination and germination rate in seeds of M. scutellata and M. polymorpha. After 10 days freezing the germination rate increasing by 90%. Keeping seeds on surface run off also has applied result. After seven days germination rate in seed of M. scutellata become 90%. Chemical scarification with sodium hypochlorite was not well to breaking hardseededness.
کلید واژگان :Medicago scutellata Medicago polymorpha Dormancy and germination
ارزش ریالی : 600000 ریال
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