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

ABSTRACT

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 x 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.

¹ Contribution from the Texas Agric. Exp. Stn., Texas A&M Univ., College Station, TX 77843, Hatch Projects 3701 and 6100.

² Professor, Graduate Assistant, Former Graduate Assistant (now Soil Microbiologist, Dep. of Agric., Bangken, Bangkok-9, Thailand), Dep. Soil and Crop Sciences, and Professor, Texas A&M Univ. Agric. Research and Extension Center, Beaumont, TX, respectively.

Received for publication May 5, 1986.