I too had to laugh at the "soil too rich" comment. Somehow I suspect the fertilizer companies had a hand in shaping those guidelines. What they mean is, your soil is too rich to sell you any chemical fertilizers.
I'm sure I also suffer from the same problem. I have drip irrigation and an injector, but even adding just a little chem ferts burns the heck out of my plants. Dark soil and compost contain humic acid, which accelerates nutrient uptake. This is a real problem....for the fertilizer company.
Here's a pic of one of my dwarf plants from last year. It looks like an ad trying to sell fertilizer, but the plant did not have anything other than good soil:
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