We have information from several sources:
Developing Switchgrass as a Bioenergy Crop—S. McLaughlin, J. Bouton, D. Bransby, B. Conger, W. Ocumpaugh, D. Parrish, C. Taliaferro, K. Vogel, and S. Wullschleger
Farmers' Motivations for Adoption of Switchgrass—Patricia C. Hipple and Michael D. Duffy
Costs of Producing Switchgrass for Biomass in Southern Iowa—Michael D. Duffy and Virginie Y. Nanhou
Biomass Yield Stability of Switchgrass Cultivars—Roger G. Fuentes and Charles M. Taliaferro
Magness, J.R., G.M. Markle, C.C. Compton. 1971. Food and feed crops of the United States.