The symbiotic nitrogen fixing bacteria have usually been grouped on the basis of their ability to cause inoculation in certain species or groups of leguminous plants. In this system of classification the soybean bacteria (Rhizobium japonicum) are usually placed alone as no conclusive evidence of cross inoculation with any other legume has been secured. Within this species certain differences in physiological reactions may be noted. Variations in the efficiency of the soybean organisms both in their ability to infect the host plant and in their ability to fix nitrogen are quite generally recognized. The suggestion has also been made that certain varieties of soybeans are more difficult to inoculate than other varieties.
Proceedings of the Iowa Academy of Science
©1929 Iowa Academy of Science, Inc.
Pohlman, G. Gordon and Walker, R. H.
"The Inoculation of Different Varieties of Soybeans by Various Strains of Rhizobium japonicum,"
Proceedings of the Iowa Academy of Science, 36(1), 63-67.
Available at: https://scholarworks.uni.edu/pias/vol36/iss1/8