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Evidence of the biological origin of soil fungistasis


, : Evidence of the biological origin of soil fungistasis. Zeitschrift fuer Pflanzenkrankheiten und Pflanzenschutz 89(7): 427-434

Soil fungistatic activity against Verticillium dahliae was studied in relation to soil depth and other soil factors. The fungistatic effect was reduced as the soil depth increased; this seems to be related to the poor organic matter, moisture content and lesser microbial activity observed with an increase in soil depth. The fungistatic factor was destroyed by autoclaving the soil but it reappeared with the inoculation of micro-organisms to the soil. Hydrocarbons (i.e., ethylene and methane) were detected in 3 soil types tested by gas chromatography. The top soil, which is rich in organic matter content and in microflora, exhibited greater fungistatic effect and also produced greater amounts of ethylene. The amounts of the hydrocarbons produced are also found to differ at different temperatures and to vary with season. Ethylene and methane were detected as metabolic products of soil micro-organisms, indicating their possible involvement in soil fungistasis.

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