Extension has a piece where they analyzed the phosphorus and potassium added to an organic farm (since 1985) and the adverse effects of excess P and K.
Perhaps I'm too skeptical of the food movement but I suspect some of the adherents believe that "natural" equates to "easy". After all, if you don't have to hassle with herbicides and pesticides and just rely on Mother Nature how difficult could farming be? But as shown in the piece, if you want to maximize what you produce you're faced with the problem of analyzing and adjusting your inputs.
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