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Old May 25, 2017   #12
Join Date: Oct 2013
Location: Chicago IL
Posts: 805

It depends what you following. If you are NPK traditional gardener, then local extension just fine and less expensive.
Once you go into "alchemy" of biological gardening I have found best those 3 sites. They are slightly different in how they test. There also some informational articles on each site.
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