To provide a new and improved soil preparation method for growing benthic organisms and a method for growing benthic organisms, which can stably grow benthic organisms.MEANS FOR SOLVING THE PROBLEM: In order to solve the problems, a soil preparation method for growing benthic organisms is provided. According to a certain viewpoint of the present invention, a mixed soil for growing benthic organisms is prepared by mixing earth and sand and steelmaking slag, and the solid organic carbon concentration in the earth and sand is characteristically 15 mg/g or more.SELECTED DRAWING: None
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