4R

Note from Tom: A couple of weeks ago, I eluded in the post entitled “Looking at Both Sides of the Equation” that Nitrogen Index tool was the only nitrogen tools that provided information on the amount of nitrogen that is lost for a crop system by leaching, surface transport, and  denitrification.  Shortly after posting this article, I received an email from Dr. Harold van Es of Cornell University correcting this statement.  The following is a guest blog by Dr. van Es.Guest post written by Dr. Harold M. van Es, Cornell UniversityThese days, …