Every year in Iowa, products are touted to producers as being the cure for crop production and economic woes. The old adage states "If it sounds too good to be true, then it probably is." How do you know whether a particular product is a viable fertilizer and supplies crop nutrients, or has some proven effect on soil that will improve productivity? The standard advice is to demand unbiased research results that document all claims, and to discount testimonials. If well-documented research isn't available, then be suspicious of claims.
Iowa State University
Sawyer, John E., "Nonconventional soil additives" (2003). Integrated Crop Management News. 1601.
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