Natalie Rector, Tim Harrigan, Dale Mutch, and Siglinde Snapp- Michigan State University Extension
February 2009
Michael Plumer – University of Illinois Extension
2008
Effect of Tillage and Annual Ryegrass Cover Crop on Corn Yield
Jochum Wiersma – University of Minnesota; Joel Ransom – North Dakota State University
2005
Source link here.
Charles W. Marr, Rhonda Janke, Paul Conway – Kansas State University
November 1998
Cover Crops for Vegetable Growers
Source link here.