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Mycorrhizal fungi is hosted by the trees in their roots to receive nutrients from the soil.
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These fungi provide essential nutrients like nitrogen, phosphorus and potassium from soil in exchange for carbon from the tree.
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This plant-fungal symbiotic relationship is crucial for the health of the tree.
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However, high levels of the nutrition elements like nitrogen and phosphorus in the mycorrhizae changes them to act as pollutants rather than nutrients.