Abstract
Long-term experiments with perennial cellulosic energy crops are needed to determine stand longevity and yield trends over time, as affected by weather. Consequently, the objectives of this study were to determine the long-term biomass yields of eight switchgrass (Panicum virgatum L.) cultivars in Alabama and to evaluate effects of weather variables on annual yields. Two lowland cultivars (Alamo and Kanlow) and six upland cultivars (Blackwell, Cave-in-Rock, Kansas-Native, Pathfinder, Summer, and Trailblazer) were evaluated in a small-plot experiment in central Alabama. Plots were planted in 1989 and fertilized with 84 kg N ha−1 annually, split into two equal applications. The experiment received no P and K fertilizer, herbicides, or irrigation. Annual yields were determined by harvesting plots twice each year, from 1990 to 2009. Growing season (March 1 to October 31) precipitation ranged from 405 to 1,294 mm. All plots remained productive during the experimental period. Average yields were generally higher than those reported from other experiments and that of Alamo (23.5 Mg ha−1 year−1) was higher than yields of the other seven cultivars. Although yields of lowland cultivars varied over time, this variation was not related to age of stand or precipitation. In contrast, yields of all upland cultivars increased over the first 12 years, and yields of Blackwell, Cave-in-Rock, Kansas-Native, and Summer were positively related to precipitation. It is concluded that under similar soil, environmental, and management conditions, stands of switchgrass should be productive for 20 years or more.
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References
US Department of Energy (2009) Workshop report: high yield scenario workshop series. Available at https://inlportal.inl.gov/portal/server.pt/community/bioenergy/421/high_yield_scenario/8985. Accessed 10 Jun, 2013
US Department of Energy (2011) US Billion-ton update: biomass supply for a bioenergy and bioproducts industry. http://www1.eere.energy.gov/biomass/pdfs/billion_ton_update.pdf. Accessed 10 Jun 2013
Bransby DI, Smith HA, Taylor CR, Duffy PA (2005) Switchgrass budget model: an interactive budget model for producing and delivering switchgrass to a bioprocessing plant. Ind Biotech 1:122–125
Fike JH, Parrish DJ, Wolf DD, Balasko JA, Green JT Jr, Rasnake M, Reynolds JH (2006) Long-term yield potential of switchgrass-for-biofuel systems. Biomass Bioenergy 30:198–206
Wullschleger SD, Davis EB, Borsuk ME, Gunderson CA, Lynd LR (2010) Biomass production in switchgrass across the United States: database description and determinants of yield. Agron J 102:1158–1168
Phillips A (2013) United States drought of 2007. Science & Nature. http://suite101.com/article/united-states-drought-of-2007-a369746. Accessed 28 Jul 2013
Parrish DJ, Fike JH (2005) The biology and agronomy of switchgrass for biofuels. Crit Rev Plant Sci 24:423–459
Huang P (2012) Evaluation of selected cellulosic energy crops for the southeastern United States. Dissertation, Auburn University
Ma Z, Wood CW, Bransby DI (2000) Impacts of soil management on root characteristics of switchgrass. Biomass Bioenergy 18:105–112
Acknowledgments
The authors express their appreciation to Mr. Stevan Nightengale and Ms. Susan Sladden who both conducted field work and data collection in this project for over 20 years.
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Bransby, D., Huang, P. Twenty-Year Biomass Yields of Eight Switchgrass Cultivars in Alabama. Bioenerg. Res. 7, 1186–1190 (2014). https://doi.org/10.1007/s12155-014-9448-2
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DOI: https://doi.org/10.1007/s12155-014-9448-2