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Previous posts have touched on the 15 essential plant nutrients (3 from the air and water, 3 macro, 3 secondary, and 6 micronutrients). These elements are absolutely necessary for the plant in order to complete its life cycle, while less than adequate amounts will impact growth and yield.

There are several other elements which might be essential, and others which could be beneficial, and still others where science really isn't sure one way or another.  This post will explore those elements.