1. Energy Biosciences Institute, University of Illinois at Urbana‐Champaign, Urbana, IL
2. Department of Plant Biology, University of Illinois at Urbana‐Champaign, Urbana, IL
3. Natural Resources and Ecology Laboratory, Colorado State University, Fort Collins, CO
4. USDA Agricultural Research Service, Soil Plant Nutrient Research, Fort Collins, CO
5. USDA Agricultural Research Service, Pasture Systems and Watershed Management Research Unit, University Park, PA