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2nd plant passage 39VSSVd ability to aid agar culture aid plant growth alsike clover bacteroids CD bO cd cd cd changes CM CD CM H CM tO CM color correlated differences dry weights efficiency experiment 21 fix nitrogen fixation of nitrogen form nodules ft ft ft grams green medium H CD H CM H H H H rH Hiltner host plant ineffective japonicum legume leguminosarum leguminous plants mannitol nitrogen fixed nitrogen percentages nodule bacteria nodule organisms nodule-forming pea nodule plan-s plant passage cultures plant passage series plants inoculated PLATE poor strains red clover rH CM rH H rH rH rH Rhizobia Rhizobium trifolii root nodule root system sand sativum seed soil Soil inoculation soybeans species Tables taken for inocula tap root Trifolium pratense type of nodule Ueber uninoculated plants Vicia Vicia Faba virulence weights and nitrogen