Friesia X, 4-5
Friesia X, 4-5
Friesia X, 4-5
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FRIESIA . Bind X . Hefte 4-5 . 1974<br />
CENOCOCC UM GEOPHILUM FR. IN ARABLE<br />
SOIL IN DENMARI{<br />
By HANS ARNE JENSEN<br />
Danish State Seed Testing Station, Lyngby, Denmark<br />
SUMMAR Y<br />
An investigation of the seed content in Danish arable soil revealed<br />
a large number of sclerotia of the imperfect fungus Cenococcum geophilum<br />
FR. (syn. C. graniforme (Sow.) FERD. et WINGE) , which has<br />
only once before been reported as occurring in arable soil (ELLIS, New<br />
Jersey, USA., 1889).<br />
By analysing soil samples from 57 fields sc1erotia of Ceno coccum<br />
geophilum were found in all samples examined, For 37 of these fields<br />
the number of sclerotia was determined at a depth of 0-20 cm. The<br />
number of sc1erotia va ried between 0.07 mill. and 50.09 mill. per m",<br />
and the average was 4.42 mill. per m-. The same 37 soil samples were<br />
further examined for t he folIowing soil factors: Content of humus,<br />
pH , specific conductivity, cation capacity, Na , K, Ca, Mg, Mn, Fe, Cu,<br />
Zn, and P. The soil samples proved to be rather different ; fx. the pH<br />
varied between 5.0 and 7.4 and the content of humus between 2.9 %<br />
and 76.3 %. Nine of the 13 soil factors examined showed a significant<br />
correlation between the values measured and the number of sclerotia.<br />
However, none of the factors seerned to be the only determining<br />
factor for the number of sclerotia present in the soil.<br />
It is concluded that Cenoco ccum geophilum must be considered<br />
common in cultivated soil in Denmark and probably also in other<br />
countries with similar edaphic and climatie conditions.<br />
INTROD U CTION<br />
An investigation of the seed content in some Danish fields (JENsEN<br />
1969), effected by mieroscopy of washed soil samples, disclosed a<br />
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