Drought effects on composition and yield for corn stover, mixed grasses, and Miscanthus as bioenergy feedstocks

Authors

Rachel Emerson, Idaho National Laboratory
Amber Hoover, Idaho National Laboratory
Allison Ray, Idaho National LaboratoryFollow
Jeffrey Lacey, Idaho National Laboratory
Marnie Cortez, Idaho National Laboratory
Courtney Payne, National Renewable Energy LaboratoryFollow
Douglas L. Karlen, USDA-ARS National Laboratory for Agriculture and the EnvironmentFollow
Stuart Birrell, Iowa State UniversityFollow
David Laird, Iowa State UniversityFollow
Robert Kallenbach, University of MissouriFollow
Josh Egenolf, University of Georgia
Matthew Sousek, University of Nebraska-LincolnFollow
Thomas Voigt, University of IllinoisFollow

Document Type

Article

Date of this Version

2014

Citation

Biofuels, Volume 5, Issue 3, May 2014, pages 275-291

Comments

This is an Open Access article. Non-commercial re-use, distribution, and reproduction permitted.

Abstract

Drought conditions in 2012 were some of the most severe in recent history. The purpose of this study is to examine the impact of drought on quality, quantity, and theoretical ethanol yield (TEY) of three bioenergy feedstocks, corn stover, mixed grasses from Conservation Reserve Program lands, and Miscanthus × giganteus. To assess drought effects on these feedstocks, samples from 2010 (minimal to no drought) and 2012 (severe drought) were compared from multiple locations in the US. In all feedstocks, drought significantly increased extractives and reduced structural sugars and lignin; subsequently, TEYs were reduced 10–15%. Biomass yields were significantly reduced for M. × giganteus and mixed grasses. When reduction in quality and quantity were combined, TEYs decreased 26–59%. Drought negatively affected biomass quality and quantity that resulted in significant TEY reductions. Such fluctuations in biomass quality and yield may have significant consequences for developing lignocellulosic biorefineries.