Several rhizobial species within a cross-inoculation group should be able to grow with particular legume species such as alfalfa. However, the same cross-inoculation group would be unable to associate with another legume species such as peas.

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This is true because each legume species has its own specific symbiotic relationship with certain rhizobial species or strains, and not all rhizobia can effectively nodulate all legumes. This is why it is important to use the appropriate rhizobial inoculant for each specific legume crop.

Several Rhizobial Species Within a Cross-Inoculation Group Should Be Able