How deep can radish roots go?

GroundHog Radish at 6 weeks 001
I imagine that the finer roots went deeper than 15"...and maybe much deeper from what I am learning!

After 6 weeks my GroundHog Radish is around 12″ deep and 1″ in circumference at the top.  How deep can radish roots go?  Because we need to know things like that I have been doing quite a bit of research.  The attached chart shows how deep some radishes can go…over 4 feet deep!  WOW!

http://www.soilandhealth.org/01aglibrary/010137veg.roots/010137ch17.htmlRadish Root depth
Research done in the 1950's shows Early Scarlet Turnip White-tipped radish roots can go over 4' deep!

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