Answers are grounded in this paper and cite their sources.
C. P. Chanway, F. B. Holl, R. Turkington, Effect of Rhizobium Leguminosarum Biovar Trifolii Genotype on Specificity between Trifolium Repens and Lolium Perenne, Journal of Ecology, Vol. 77, No. 4 (Dec., 1989), pp. 1150-1160
No takes yet. Share an insight, caveat, or question.
Chanway et al. (1989) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: