Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 January 1964
Published in Agron J 56:60-62 (1964)
© 1964 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Selection of Competitive Strains of Soybean Nodulating Bacteria1

Herbert W. Johnson and Ura Mae Means2

Synopsis: Competitive relationships of six strains of Rhizobium japonicum with chlorosis-inducing strain 76 identified under essentially sterile conditions in greenhouse tests were confirmed in the more complex environment of a field soil containing few soybean nodulating bacteria. Thirteen of 299 strains evaluated for competitiveness had a competitive advantage over strain 76 in greenhouse tests. Six strains ranked for competitiveness with strain 76 had similar ranks when evaluated in all combinations with each other.

1 Contribution from Crops and Soil and Water Conservation Research Divisions, ARS, USDA, Beltsville, Maryland.

2 Research Agronomist and Bacteriologist, respectively.

Received for publication June 1, 1963.




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Copyright © 1964 by the American Society of Agronomy.