1. Department of Crop Sciences University of Illinois at Urbana‐Champaign Urbana Illinois USA
2. USDA Agricultural Research Service Northern Great Plains Research Laboratory Mandan North Dakota USA
3. World Agroforestry Center Nairobi Kenya
4. Department of Soil and Environmental Sciences National Chung Hsing University Taichung City Taiwan China
5. Department of Agronomy, Horticulture, and Plant Science South Dakota State University Brookings South Dakota USA