I think the numbers on the bag are way over hyped. If you used 5-2-3 and applied it just slightly heavier than recommended, you would get the same effect as if you used one with more nitrogen.
I don't try to over analyze the diet for my soil microbes. I prefer to feed them corn meal because it is cheap and has other benefits. Every batch of corn has a different protein analysis, but who cares? I do believe the commercial brands of organic fertilizers, such as Espoma and others, perform better than straight corn meal because they contain a mix of different grains. The only problem with them is they cost about 6x more than corn meal. Soy and alfalfa have more nitrogen (higher range), but I don't really see that the exact measurement is that important.
_________________ David Hall Moderator Dirt Doctor Lawns Forum
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