SmithsJunk
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Ph vs nutrient abilities of marijuana plants
Something about that chart doesn't make sense to me. On the soil side, how is it even possible that iron and manganese are completely unavailable in the proper range? Don't plants at least need a trace supply of those elements and wouldn't all soil plants show a deficiency without them?
So I looked it up myself. Unless there is a legend that explains that those are the "best" ranges for uptake, and you've neglected to post it with the illustration, then that chart is wrong and you shouldn't be using it.
Here's an example of a proper and useful elemental uptake chart from the Cannabis Encyclopedia.