title: Influence of soybean inoculation and nitrogen levels on populations and serogroups of Rhizobium japonicum in Ontario.
mesh_terms: D005308:Fertilizers; D009584:Nitrogen / Q000032:analysis*; D009864:Ontario; D012231:Rhizobium / Q000145:classification / Q000302:isolation & purification*; D012703:Serotyping; D012987:Soil / Q000032:analysis; D012988:Soil Microbiology; D013025:Glycine max
chemical_list: D005308:Fertilizers; D012987:Soil; D009584:Nitrogen