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Ninety-six alfalfa rhizobial strains were screened with a two-step strategy to select high effective and competitive microsymbionts for this plant grown in Inner Mongolia. Firstly, all the strains were inoculated to surface-sterilised seeds sown in vermiculite and grown in greenhouse. After grown 45 days, the shoot dry weight, number and nitrogenase activity of nodules were recorded and statistically...
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