By: Dan Kaiser, Extension nutrient management specialist I have been fielding a lot of questions about biological soil fertility products the last few years. With the sheer number of products that are available to farmers, it is not feasible to conduct research on all of them. So, what resources are available? There is a new regional publication put together by Dave Franzen from North Dakota State University summarizing the NCERA 103 committee’s recent research on biological products. While this will not cover every product on the market, the new report contains independent research on several of the most common products being marketed to farmers in the Midwest. Read the full publication (PDF) What are biologicals? While there are many classes of what we call “biostimulants,” most of the more heavily marketed products fall under the category of beneficial bacteria. The bacteria are commonly free-living N fixers that are already found in most of our soils. What is being attempted is to...