Given what we know, we can confirm that the soil in field C most likely lacks the presence of microbes that help plants grow or has a higher presence of microbes that are harmful to plant growth.
This would mean that the microbe in question has a symbiotic relationship with plants. Meaning that it promotes plant growth in exchange for nutrients from the plant, and both organisms will benefit, similar to microbes such as AM fungi.
Therefore, we can confirm that the soil in field C is likely to lack plant symbiotic microbes that are most likely found in fields A and B.
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