When growing anything, including livestock, the best way to maximize your returns is to make sure that the inputs (fertilizers, time, etc.) don't cost more than what your end product is worth. Today you'll hear about the corn nitrogen rate calculator at (iastate.edu)http://cnrc.agron.iastate.edu/.  We discuss why using tools like these will help your bottom line.  We also cover other ways to improve soil productivity like increasing organic matter.