You can contact the extension specialist in your state if you have additional questions or are having difficulty with the calculations.

Illinois:	Emerson Nafziger	217-333-4424	ednaf@uiuc.edu
Indiana:	Jim Camberato	765-496-9338	jcambera@purdue.edu
Iowa:	Antonio Mallarino		apmallar@iastate.edu
Michigan:	Kurt Steinke	517-355-0271	ksteinke@msu.edu
Minnesota:	Daniel Kaiser	612-624-3482	dekaiser@umn.edu
Ohio:	Greg LaBarge		labarge.1@osu.edu
Wisconsin:	Matt Ruark		mdruark@wisc.edu