Inoculation of alfalfa seeds with any of three recombinant strains of Sinorhizobium meliloti significantly increased overall plant biomass compared with inoculation with the wild-type strains over a 3-year period at three locations. A high proportion of nodules were occupied by the inoculum strains throughout the 3-year period.
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Scupham et al. (1996) studied this question.
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