neoguy - good question. The truth is, we don't know what the GMO products will do. No one has studied the short or long-term effect of GMOs in soil composition. The poster above is correct in that they will break down and add to the organic matter in the soil (a good thing) but the idea that they will do nothing is simply unknowable -- it's never been studied (to my knowledge, but someone do correct me if they know of existing science). Either way it is a choice I have made because even if the GMO ingredients in the fertilizer don't affect my soil or crops, I believe their affect on biodiversity is a negative one thus I avoid them whenever possible.
Back to the original thread topic, I've been referred by a member on this forum to a book called "The Intelligent Gardener" for advice on fertilizer and more generally building nutrient-dense soil. In the mean time I'll continue to use the resources posted here. Thanks to everyone for the suggestions.
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