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One way is to culture the bacteria on a sterile agar plate with a small sample of the soil. After incubating the sample at about 20 degrees (Celsius) for a couple of days you should be able to see the bacteria, it's normally either a shiny patch or it's a yellowish colour. With soil though, there will most likely be a large amount of fungal growth, which you can identify by it's white, fuzzy appearance.

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13y ago
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Q: How can you prove that there is bacteria in soil?
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