Rhizoctonia-Rhizobium Interactions in Relation to Yield Parameters of Soybean

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Abstract
Rhizoctonia solani significantly reduced top and nodule weights of ''Lee'' and ''Kent'' soybeans [Glycine max] inoculated with Rhizobium japonicum and grown in a N-free sand-nutrient substrate as compared with plants grown with Rhizobium alone. For ''Lee'' soybeans, a 63% decrease in fixed N per plant due to the fungus was demonstrated. In Rhizobium-inoculated ''Kent'' soybeans grown in the presence of Rhizoctonia at either 15, 20 or 25.degree. C, top and nodule weights and the total N content per plant were also reduced. Because resistance in soybeans to Rhizoctonia root rot is not presently available and the direct effects of this fungus on R. japonicum are unknown, this fungal pathogen may be a yield-limiting factor under a wide range of ecological conditions.

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