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Panax ginseng C.A.Mey. (Araliaceae) cultivation suffers from the inability to cultivate the same fields continuously for long durations due to replant failure. The main cause of replant failure is considered to be the annual change in the soil microbial flora, especially the invasion and settlement of pathogenic microorganisms of soil-borne diseases. We analyzed the soil bacterial and fungal flora and inter-annual changes in their composition over 5 years in ginseng cultivation fields on Daikonshima Island, Shimane Prefecture of Western Japan by DNA metabar