We have information from several sources:
Handbook of Energy CropsJames A. Duke. 1983. unpublished.
Cool-Season Grass Seed Production: Alternative Field Crops Manual, University of Wisconson Cooperative Extension Service, University of Minnesota Extension Service, Center for Alternative Plant & Animal Products
Magness, J.R., G.M. Markle, C.C. Compton. 1971. Food and feed crops of the United States.