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Nitrogen can leave the fertilizer if it is not covered with potting soil. Find out why to cover fertilizer with soil in this free video on gardening with an EarthBox. Expert: Stan DeFreitas Bio: Stan DeFreitas, also known as Mr. Green Thumb, has experience as an urban horticulturist working for the Pinellas County Extension Service and has taught horticulture at the St. Petersburg College. Filmmaker: Christopher Rokosz