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Saprophytic Activity of Rhizoctonia as Affected by the Carbon‐Nitrogen Balance of Certain Organic Soil Amendments
Author(s) -
Davey C. B.,
Papavizas G. C.
Publication year - 1963
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1963.03615995002700020023x
Subject(s) - rhizoctonia , straw , cellulose , nitrogen , agronomy , chemistry , botany , biology , rhizoctonia solani , organic chemistry
Carbon (C) from cellulose added to soil slightly suppressed the competitive saprophytic activity of Rhizoctonia , whereas nitrogen (N) from NH 4 NO 3 increased it. Cellulose and NH 4 NO 3 , 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 NH 4 NO 3 suppressed 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.