Pine seedlings grown in sterile potting soil grow much slower than seedlings grown in soil from the area where the seeds were collected. This is most likely because

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The slower growth of pine seedlings in sterile potting soil is likely due to the absence of normal symbiotic fungi (mycorrhizae) that aid in water and mineral uptake, which are present in the soil from the area where the seeds were collected.

Pine Seedlings Grown in Sterile Potting Soil Grow Much Slower