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This article in SSSAJ

  1. Vol. 27 No. 2, p. 164-167
    Received: Apr 16, 1962



Saprophytic Activity of Rhizoctonia as Affected by the Carbon-Nitrogen Balance of Certain Organic Soil Amendments1

  1. C. B. Davey and
  2. G. C. Papavizas2



Carbon (C) from cellulose added to soil slightly suppressed the competitive saprophytic activity of Rhizoctonia, whereas nitrogen (N) from NH4NO3 increased it. Cellulose and NH4NO3, combined to produce a wide range of C/N ratios and incorporated in soil, suppressed Rhizoctonia activity at most C/N ratios. With certain exceptions, soil bacteria and fungi increased in numbers with decreasing C/N ratios. Soil streptomycetes were not greatly affected. Oat straw and soybean hay enriched with NH4NO3suppressed Rhizoctonia activity at all C/N ratios tested. The cellulolytic fungus Humicola greatly increased in numbers in the presence of decomposing oat straw whereas Trichoderma was not affected.

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