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Published online 1 March 1966
Published in Agron J 58:223-224 (1966)
© 1966 American Society of Agronomy
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Effect of Soil Actinomycetes on Strains of Rhizobium japonicum1

Salih M. Damirgi and Herbett W. Johnson2

Twenty-four isolates of Actinomycetes were taken from soil of an experimental soybean field. Susceptibility of eight Rhizobium japonicum strains to antimicrobial action of the Actinomycete isolates on yeast extractmannitol agar was tested. Twenty of the isolates produced no inhibition of rhizobia. Isolate E1 antagonized only R. japonicum strain 76 and isolate E8 was antagonistic to all strains. Two other isolates showed slight inhibition of strains 122 and 123.

Infectivity of rhizobia on soybean variety Kent was evaluated in the presence of selected Actinomycete isoiates. In autoclaved soil, reductions in nodule numbers produced by rhizobial strains were 35% and 53%, when Actinomycete E8 was introduced into the soil at the time of planting and 28 days before planting, respectively. Generally, similar results were obtained in sterilized sand jars.

The results suggest that anti-rhizobial soil microorganisms in a particular soil play a role in the establishment of specific rhizoblal strains.

1 Cooperative investigation between the University ef Maryland and Crops and Soil and Water Conservation Research Divisions, ARS, USDA, Beltsville, Maryland. Contribution No. 3694 Scientific Article No. Al196 of the Maryland Agr. Exp. Sta. Department of Agronomy, College Park, Maryland.

2 Respectively, Postdoctoral Research Associate, Agronomy Department, University of Maryland, (now Soil Microbiologist, College of Agriculture, University of Bagdad, Abu-Ghraib, Iraq), and Research Agronomist, Crops Research Division, ARS, USDA, Beltsville , Maryland, (now Head, Dept. of Agronomy and Plant Genetics, University of Minnesota, St. Paul, Minnesota).

Received for publication September 24, 1965.




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The SCI Journals Crop Science Vadose Zone Journal
Journal of Natural Resources
and Life Sciences Education		 Soil Science Society of America Journal
Journal of Plant Registrations Journal of
Environmental Quality		 The Plant Genome
Copyright © 1966 by the American Society of Agronomy.