Effects of Organic Materials on Soil Organisms in a Korean Ginseng Field
2010
Eo, J.U., Ginseng Research Division, RDA, Eumseong, Republic of Korea | Park, K.C., Ginseng Research Division, RDA, Eumseong, Republic of Korea | Lee, S.W., Ginseng Research Division, RDA, Eumseong, Republic of Korea | Bae, Y.S., Ginseng Research Division, RDA, Eumseong, Republic of Korea | Yeon, B.R., Ginseng Research Division, RDA, Eumseong, Republic of Korea
The aim of this study is to evaluate the effects of organic materials on soil organisms. Changes in the community structure and population density of soil organisms (microbes, nematodes, and microarthropods) were studied in a Korean ginseng field. Phospholipid fatty acids analysis showed that the relative abundances of bacteria, fungi, and actinomycetes did not differ significantly. The aerobes/anaerobes ratio was the lowest in soils amended with leaf mold, indicating that the decomposition speed was slow. Further, the addition of leaf mold to the soil enhanced the saturated/monounsaturated fatty acid ratio and cyclopropyl fatty acid/precursor ratio, which indicated an increase in environmental stresses. Application of pig manure compost (PMC) had positive effects on the population density of nematodes and negative effects on that of oribatid mites. The population densities of nematodes and microarthropods remained relatively low in the plots that had been treated with leaf mold or pig manure compost. It is suggested that pre-planting soil management directed at enhancing the biological decomposition efficiency should be continued over a long period to increase the soil bioactivity in virgin soils.
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