Journal
BIOMASS & BIOENERGY
Volume 85, Issue -, Pages 153-158Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.biombioe.2015.11.031
Keywords
Theoretical ethanol yield; Nutrient removal; Corn; Carbohydrates; Stover removal
Funding
- Alabama Wheat and Feed Grain Producers Commission of the Alabama Farmers Federation
- North Central Regional Sun Grant Center at South Dakota State University through USDOE - Office of Biomass Programs [DE-FC36-05GO85041]
- ARS [ARS-0425540, 813547] Funding Source: Federal RePORTER
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Corn (Zea mays L.) stover has been identified as an important feedstock for bioenergy and bio-product production. Our objective was to quantify nutrient removal, carbohydrate composition, theoretical ethanol yield (TEY) for various stover fractions. In 2009, 2010, and 2011, whole-plant samples were collected from one field study in South Carolina (SC) and two in Alabama (AL). Soils at the SC site were classified as a Coxville/Rains-Goldboro-Lynchburg association, while those in AL were either Compass or Decatur. Plants were collected from two 1-m row segments, ears were removed and shelled. A portion of the remaining stalks were dried and ground to represent whole-plant stover. The remaining stalks were fractionated into stalk and leaf biomass from below the ear (bottom), stalk and leaf biomass from above the ear (top), cobs, and grain. A fifth sample representing above-ear biomass that might be collected mechanically was calculated using the weight ratios of the top and cob fractions. Carbohydrate and nutrient concentrations were estimated using near-infrared spectroscopy (NIRS) and TEY was calculated. The distribution of carbohydrates, nutrients, and TEY varied significantly among the corn stover fraction and research locations. This indicates that site-specific sampling and analysis should be used to optimize bioenergy and bio-product utilization of corn stover. However, at every location, the above-ear stover fractions were most desirable for cellulosic ethanol production. Furthermore, harvesting only above-ear stover fractions would reduce nutrient removal by 24-61% when compared to harvesting all stover biomass. (C) 2015 Elsevier Ltd. All rights reserved.
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