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Competitiveness of Selected Bradyrhizobium japonicum Strains in Midwestern USA Soils

Dep. of Plant and Soil Science, Southern Illinois Univ., Carbondale, IL 62901

L. L. Hendrickson

Eni Chem Americas, 2000 Princetonpark Corporate Center, Monmouth Junction, NJ 08852

R. M. Zablotowicz

Allexlix, Inc., 6850 Goreway Dr., Mississagua, Ot, Can, L4V 1P1

J. E. Skwara

Ecogen, Inc., 2005 Cabot Blvd. West, Langhorne, PA 19047

E. C. Varsa

Dep. of Plant and Soil Science, Southern Illinois Univ., Carbondale, IL 62901

S. Smith

The Nitragin Co., Inc., 3101 W. Custer Ave., Milwaukee, WI 53209

T. G. Islieb, Jaime Maya, Maria Valdes and F. B. Dazzo

Dep. of Microbiology, Michigan State Univ., East Lansing, MI 48824

R. L. Todd and D. D. Walgenback

Dep. of Microbiology and Plant Science, South Dakota State Univ., Brookings, SD 57007

*Corresponding author.

ABSTRACT

The competitiveness of 19 selected Bradyrhizobium japonicum strains in the midwestern USA was evaluated in field studies during 1984 and 1985. Of the 11 selected strains evaluated in 1984, a range in nodule occupancy of 0.3 to 15.7% was observed across three locations in Illinois and Wisconsin. During the second year of the study, 7 of 12 strains showed nodule occupancy averaging between 14.8 to 26.6% for eight locations in Illinois, Michigan, South Dakota, and Wisconsin. Strain An-11 exhibited an average nodule occupancy of 15.7% in 1984 and 26.6% in 1985 which was significantly greater than any of the other 18 strains tested. Estimates of biologically-fixed N via non-nodulating isolines of soybean (Glycine max L.) showed a significant difference between one inoculum treatment (strain An-14) and the noninoculated control for only one location (Plainfield, WI) during the second year of the study. No significant differences in grain yield were observed in either year of the study. The data suggests that selected strains of B. japonicum can be more successfully introduced into midwestern USA soils if they are adapted for the soils and cultivars in that geographic region.

Article no. 12231 of the Michigan Agric. Exp. Stn.

Received for publication May 18, 1987.

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