Abstract
Using a marking technique to determine the location of infectible regions on the roots of white clover, nodulation frequency profiles for three strains of Rhizobium trifolii were obtained every 2 days for 10 days at pH 6.7 and 5.0 in N-free rooting solution. For all strains, the first nodules were formed in the region of the primary root which bore no root hairs (NRH zone) at the time of inoculation. Strains differed significantly in the speed with which they nodulated this zone. There were also similar significant differences in the percentage of plants nodulated by each strain in the NRH zone 10 days after inoculation. At both solution pH values, there was a positive correlation between the speed with which a strain nodulated the NRH zone in single culture and its nodulating competitiveness in mixed culture.
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