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Soil is mixed with water and diluted many times (over a million times). The soil-water mixture is spread over agar (like gelatin)and the soil microbes grow into colonies. These microbes are tested for their ability to protect plants from diseases.
Beltsville Agricultural Research Center
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Soil is mixed with water and diluted many times (over a million times). The soil-water mixture is spread over agar (like gelatin)and the soil microbes grow into colonies. These microbes are tested for their ability to protect plants from diseases.