Utilization of Annual Warm-Season Grasses as a Biofuel Source and Feedstock By-Product
- 1 Department of Plant and Soil Sciences, Mississippi State University, Starkville, USA
- 2 Department of Plant and Soil Sciences, Mississippi State University, Starkville, USA
Abstract
Annual warm-season grasses such as forage sorghum, sorghum × sudangrass hybrid and sundangrass are highly productive and valuable feed crops (rotational crop and silage). In addition, sugar in the stems of these warm-season grasses can be extracted and fermented, while the cellulose in the bagasse (pressed stalk) can be used for feedstock or cellulosic ethanol, making them versatile to both the forage and biofuel industry. Twelve annual warm-season grasses including forage sorghums, sudangrass, sorghum × sudangrass hybrid, and pearl millet were planted in 1.82 m × 3.35 m plots, harvested and treated as silage and hay before and after sap removal. Dry matter (DM) yield from a single harvest in 2011 and 2012 were collected and analyzed. Further analysis from the varieties includes evaluation for sap production, <sup>O</sup>Brix, crude protein (CP), Neutral Detergent Fiber (NDF), and Acid Detergent Fiber (ADF). Forage quality in silage was negatively affected by removing the sap before ensiling, producing quality similar to that of the hay samples. Sugar yields (SY) were not comparable to sweet sorghum yields reported in the literature, but when considering SY along with bagasse yield a few varieties may offer the potential as a dual purpose crop.
- Corredor, D.Y., Salazar, J.M., Hohn, K.L., Bean, S., Bean, B. and Wang, D. (2008) Evaluation and Characterization of Forage Sorghum as Feedstock for Fermentable Sugar Production. Applied Biochemistry and Biotechnology, 158, 164-179. http://dx.doi.org/10.1007/s12010-008-8340-y
- Vermerris, W., Erickson, J., Wright, D., Newman, Y. and Rainbolt, C. (2011) Production of Biofuel Crops in Florida: Sweet Sorghum. University of Florida IFAS Extension, Gainesville.
- Smith, G.A. and Buxton, D.R. (1993) Temperate Zone Sweet Sorghum Ethanol Production Potential. Bioresource Technology, 43, 73-75. http://dx.doi.org/10.1016/0960-8524(93)90086-Q
- Smith, G.A., Bagby, M.O., Lewellan, R.T., Doney, D.I., Moore, P.H., Hills, F.J., Campbell, L.G., Hogaboam, G.J., Coe, G.E. and Freeman, K. (1987) Evaluation of Sweet Sorghum for Fermentable Sugar Production Potential. Crop Science, 27, 788-793. http://dx.doi.org/10.2135/cropsci1987.0011183X002700040037x
- Lueschen, W.E., Putman, D.H., Kanne, B.K. and Hoversted, T.R. (1991) Aromomic Practices for Production of Ethanol from Sweet Sorghum. Journal of Production Agriculture, 4, 619-625. http://dx.doi.org/10.2134/jpa1991.0619
- Linton, J.A., Miller, J.C., Little, R.D., Petrolia, D.R. and Coble, K.H. (2011) Economic Feasibility of Producing Sweet Sorghum as an Ethanol Feedstock in the Southeastern United States. Biomass & Bioenergy, 35, 3050-3057. http://dx.doi.org/10.1016/j.biombioe.2011.04.007
- Bing-Zhi, L., Balan, V., Yuan, Y. and Dale, B.E. (2010) Process Optimization to Convert Forage and Sweet Sorghumbagasse to Ethanol Based on Ammonia Fiber Expansion (AFEX) Pretreatment. Bioresource Technology, 101, 1285-1292. http://dx.doi.org/10.1016/j.biortech.2009.09.044
- Houx, J.H., Roberts, C.A. and Fritshci, F.B. (2013) Evaluation of Sweet Sorghum Bagasse as an Alternative Livestock Feed. Crop Science, 53, 1784-1790. http://dx.doi.org/10.2135/cropsci2012.03.0190
- Caielli, E.L. (1986) Case Study: Brazil, Sugarcane as Feed. In: Sansourcy, R., et al., Eds., Sugarcane as Feed, Animal Production and Health Paper No. 72, Rome, 1-13.
- Lemus, R. (2008) Forage Production Survey in Mississippi. Mississippi State University Extension Service. Unpublished Data.
- Edwards, N.C., Elmore, R., Hovermale, C., Ingram, D., Ivy, R., Johnson, B., Lang, D. and Watson, V. (1991) Performance of Warm Season Forage Crop Varieties 1988-1990. Mississippi Agricultural and Forestry Experiment Station, Inf. Bull., Starkville, 192.