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Interaction Between Protozoa and Rhizobium in Chemically Amended Soil¹

ABSTRACT

The population of a strain of Rhizobium phaseoli resistant to streptomycin, erythromycin, cycloheximide, and thiram fell markedly after its addition to soil, and the numbers of indigenous protozoa rose. In sterile soil inoculated with a protozoa-free mixture of soil microorganisms, the decline in R. phaseoli was not as marked and was not affected by the presence of thiram. When added to nonsterile soil amended with thiram or cycloheximide, the R. phaseoli strain survived in larger numbers than in soil not receiving the chemicals, and the abundance of protozoa rose after an initial decline. Only one morphological type of protozoa was found in the cycloheximide-treated soil. It is suggested that the number of protozoa as well as which protozoa are active determine the population of surviving rhizobia.

¹ Contribution from Dep. of Agronomy, Cornell Univ., Ithaca, NY 14853. These studies were supported by the U.S. Agency for International Development (grant AID/CSD-2834).

² Graduate Student and Professor of Soil Science, respectively.

Received for publication April 28, 1980. Accepted for publication September 8, 1980.