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The Growth-promoting Effect of Rhizophagus irregularis CD-1 on Five Tomato Varieties Isolation and characterization of PGPR from the rhizosphere of the Avena sativa in saline-alkali soil EFFECTS OF INOCULATION OF ECTOMYCORRHIZAL FUNGI ON THE SEEDLING GROWTH OF MONGOL SCOTCH PINE (PINUS SYLVESTRIS VAR. MONGOLICA)