Energy and economic returns are presented from 2006-2011 comparing three cropping systems at the ISU Marsden Farm: 2-year conventional corn-soybean rotation and 3- and 4-year rotations that add small grain, red clover and alfalfa.
Iowa State University
Johanns, Ann M.; Chase, Craig; and Liebman, Matt, "Energy and Economic Returns by Crop Rotation" (2012). Leopold Center Pubs and Papers. 193.