THE SYMBIOSIS EFFECT OF VESICULAR-ARBUSCULAR MYCORRHIZA ON GROWTH OF POA BULBOSA (BULBOS BLUE GRASS)

Inoculation experiments were carried out in pot culture to determine the effects of VA fungi on the growth of Poa bulbosa. In this experiment, four treatments  were  used: 1. Strile soil without  inoculation,  2. Strile soil plus inoculum, 3. Natural soil plus inoculum, and 4. Natural soil without inoculation. Inoculum was prepared from a suspension of mycorrhizal  roots of  Poa  plants (Root colonization was at 30 percent level). Plants were harvested after three months. Inoculation of  mycorrhizal plants showed increase in growth. The level of phosphorus was also high in inoculated plants compard with non-inoculated plants. Available phosphorus levels in inoculated soils were the lowest, which indicated increasing phosphorus uptake by inoculated plants. In addition, three species of Glomus were extracted from second treatment (strile soil plus inoculum). This matter indicated the direct relationship between these and colonization of roots.