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Effect of Soil Factors on the Distribution of Rhizobium japonicum Serogroups¹

ABSTRACT

The soybean variety ‘Kent’ was planted at 19 sites representing two soil types located on Maryland's Eastern Peninsula. Routine soil tests including soil organic N were performed and correlated with serological distribution of R. japonicum. Nodule samples reacted with 16 Beltsville antisera with no serogroup occupying more than 20% of the total. Beltsville serogroup 110 was positively correlated with several organic N fractions, soil NH₄⁺, and soil NO₃^- for the Sassafras soil. Serogroup 123 showed a positive correlation with soil pH and exchangeable Mg. When the Matapeake soil was considered, serogroup 94 was positively correlated with soil N status much like 110 was for the Sassafras soil.

¹ Contribution no. 4432 and Scientific Article no. A1682 of the Maryland Agricultural Experiment Station, Department of Agronomy. Presented before the Northeast Branch of the American Society of Agronomy, June 17, 1970 at College Park, Maryland.

² Assistant Professor, Department of Agronomy, University of Maryland.

Received for publication July 27, 1971. Accepted for publication October 15, 1971.