Several workers have stressed the use of efficient strains of rhizobia for fuller exploitation of the legumerhizobia symbiosis (Kandasamy and Prasad, 1971; Gasser et al, 1972) Often the successful establishment uf the inoculant rhizobia in soil is mitigated by the native rhizobia. Patil (1974 a and b) stated that the majority of rhizobial inoculant strains have falled as they did not possess the desired competitive ability to survive and spread in the presence of more aggre-ssive naturally occurring strains of native rhizobia which are already well adapted to the given ecological situation. In the present study a penicilin resistant (1000 ppm) strain (Rh VI-Pr) of an efficient rhizobial isolate (Rh VI) of groundnut was used to study the competitive ability of the inoculated rhizobia for nodulation in the presence of native rhizobia. TMV. 2. groudnut variety was used in this study. Well powdered and sterlized lignite was used as carrier for Rhizobium inoculation (Kandasamy and Prasad, 1971).
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