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Alan:

 

     I used an auger 11 years ago when I established an orchard in clay soil. Can't recall the diameter, but  I noticed the auger seemed to leave the clay subsoil on the outside of the hole glazed.  I did my best to scratch that out with a digging iron and shovel so the roots would be able to grow out beyond the hole diameter.   I can't say how much it helped but I don't think the glazing helps.  Chris Patterson