Understanding the responses of soil microbiomecomposition to various farming practices is important forselecting suitable managements to maintain soil functions. Inthis study, the influences of heavy chemical fertilizer applica-tion (CF) and reduced chemical fertilizer supplemented withorganic (OF) or bioorganic fertilizer (BF, BF = OF +Trichoderma) on composition of soil microbiome were inves-tigated for monocropping cucumber systems using a five-season continuous pot experiment. The MiSeq sequencingdata indicated that the CF treatment resulted in the lowestfungal diversity and the BF treatment resulted in a relativelyhigher one close to the initial soil (CK). The BF and OFtreatments had similar impacts on the composition of bacterialcommunity, and the CF treatment significantly reduced bacte-rial diversity. Although both OF and BF treatments had betterplant growth responses, they had less disturbance on the com-position of fungal community relative to the CF treatment.The BF treatment is more predictable than the other treatmentsfor postponing fungal diversity as the inoculated fungal spe-cies significantly (p< 0.05) affected the fungal community. Inconclusion, the combination of bioorganic fertilizers with reduced chemical fertilizer application can maintain a diversesoil microbiome in cucumber monocropping.

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