Where or when would you most likely see mutualistic relationships between plants and mycorrhizal fungi?

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Mycorrhizal fungi help plants absorb nutrients, especially phosphorus, from the soil. In nutrient-poor soils, plants are more likely to form mutualistic relationships with mycorrhizal fungi to increase their nutrient uptake, whereas in nutrient-rich soils, plants may not need the additional help from fungi.

Where or When Would You Most Likely See Mutualistic Relationships