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This article in SSSAJ

  1. Vol. 51 No. 1, p. 90-92
    Received: May 5, 1986

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Populations of Bradyrhizobium japonicum in Fields Cropped with Soybean-Rice Rotations1

  1. R. W. Weaver,
  2. D. R. Morris,
  3. N. Boonkerd and
  4. J. Sij2



The population density of Bradyrhizobium japonicum in soil, before planting, largely determines the potential yield increase of soybean (Glycine max L. Merrill) due to inoculation. Soybean is cultured in rotation with rice (Oryza sativa L.) in the paddy rice belt of the southern USA. Nineteen fields were sampled to determine the influence of paddy rice culture on the population of B. japonicum. Populations in fields following soybean were approximately 1 × 104 bradyrhizobia g−1 soil. Growing rice after soybean did not reduce the population of bradyrhizobia. Apparently the bradyrhizobia were able to survive the conditions in saturated soil for several months.

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