One of the best things you can do as a gardener is to have your soil tested. It's not a big deal to do or expensive and most Extension offices can set you up. The lab test beats a home test, at least your first one, because you know it's correct.
Here in Central Wisconsin, I have an overabundance of potassium and phosphorus, so really only need to add nitrogen and organic material to improve soil texture. Wood ash is ok in moderation, but before you load it on, find out if you need it. We have a wood burner and boiler, so generate a lot of ash too. I hate to waste it, so I also throw some in my compost pile, lawn, prairie, and woods. That way non of the areas overdoses.
Hope this helps!
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