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KMID : 0364819860240020184
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Korean Journal of Microbiology
1986 Volume.24 No. 2 p.184 ~ p.193
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Environmental Factors and the Distribution of Soil Microorganisms in Ginseng Field
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Abstract
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1
Interrelation between environmental influences on soil microorganisms and it´s effect on disease development in ginseng (Panax ginseng C.A. Meyer) field were studied to obtain a preventive measures against the root rot of ginseng caused by soil-borne pathogens in soil in three major Korean ginseng producing areas such as Kumsan, Goesan and Poonggi.
Populations of actinomycetes were relatively high in fall season from September to November. Their numbers were highly populated in healthy plot in field than replanted disease field of ginseng, whereas ratio of Trichoderma spp to actinomycetes increased in healthy plot of field indicating the higher numbers of Trichoderma spp pressented in healthy plot field. The numbers of propagules of Trichoderrna spp generally increased in early summer through early fall season. Their numbers were also highly populated in the healthy plot of fields. The contents of organic matter and phosphate in healthy plot of field were somewhat high, and phophate/organic matter ratio and Mg content were high in diseased replanted field. All of the soil samples showed a weak acidic pH from 4.5 to 4.7. Soil moisture content was increased during winter season and it did not show any significant changes during the growing period, showing 24.6% in healthy plot in field and 19.5% in diseased plot in field respectively. Soil temperature was highest in July and August and lowest in January and February.
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