What happens when corn residue is harvested

When crop residue is removed from fields, what happens to fertility levels.  Residue removal certainly has a number of implications.  Harvesting silage, baling stalks, and removing residue for biofuels, all have implications for soil quality and fertility.  Crop residue partially replaces nutrients removed from the soil.  Properly managed, the residue can also contribute to the maintenance of soil organic matter.  Both are important to maintain soil health.  Organic matter provides a slow release nutrient bank and helps maintain the tilth of our soil. While I continue to stand by the need for soil testing, it is important to consider how much is lost by harvesting stover along with grain in the corn crop.  This article from Iowa State give you some ideas to consider about what is lost when corn residue is removed.  Don't rely just on nutrient removal charts to make your fertilizer decisions.  A strong soil testing program is a necessity in all fertility decisions.