استخراج و شناسایی سوشهای ریزوبیوم همزیست با مهمترین لگوم های مرتعی استان لرستان( یونجه ، ماشک، اسپرس)

The importance of nutritional value of plants and rangelands for natural and nutritional development is clcar. The fertility of soil rangelands is a main factor for sustainable developing. Nitrogen availability in soil is limiting growth factor of plants. In the other hand 80% of atmosphere gas is N2. Legume plants have symbiotic relationship with rhizobium bacteria in soil to fix atmosphere nitrogen . In this cause we collected main legume plants in lorestan probince since 1999 for 3 years. We collected the nodules and insolated the rhizobium strains directly from the root nodules in laboratory condition.Thoes plants we isloted rhizobium strains were alfalfa vetch and orichius. The complete laboratory stage for ex. Collection of nodules-isolation of strains-purification of strains indentification and recultivation were done. Finally 40 strains were collected such as Astragulus , Vicia , onobrychis , Lathyrus trifolium that were extracted from R.Leguminosarum and R.meliloti spp.The goal of this experiment is to have collection of rhizobium strains symbiont with pasture legumes of Loretan province to help the other Research workers to compare the different strains together characteristically point of view.