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Article
Monitoring Soil Quality to Assess the Sustainability of Harvesting Corn Stover
Agronomy Journal
  • Douglas L. Karlen, United States Department of Agriculture
  • Gary E. Varvel, United States Department of Agriculture
  • Jane M. F. Johnson, United States Department of Agriculture
  • John M. Baker, United States Department of Agriculture
  • Shannon L. Osborne, United States Department of Agriculture
  • Jeff M. Novak, United States Department of Agriculture
  • Paul R. Adler, United States Department of Agriculture
  • Greg W. Roth, Pennsylvania State University
  • Stuart J. Birrell, Iowa State University
Document Type
Article
Publication Date
1-1-2011
DOI
10.2134/agronj2010.0160s
Abstract
Harvesting feedstock for biofuel production must not degrade soil, water, or air resources. Our objective is to provide an overview of field research being conducted to quantify effects of harvesting corn (Zea mays L.) stover as a bioenergy feedstock. Coordinated field studies are being conducted near Ames, IA; St. Paul and Morris, MN; Mead, NE; University Park, PA; Florence, SC; and Brookings, SD., as part of the USDA-ARS Renewable Energy Assessment Project (REAP). A baseline soil quality assessment was made using the Soil Management Assessment Framework (SMAF). Corn grain and residue yield for two different stover harvest rates (∼50% and ∼90%) are being measured. Available soil data remains quite limited but sufficient for an initial SMAF analysis that confirms total organic carbon (TOC) is a soil quality indicator that needs to be closely monitored closely to quantify crop residue removal effects. Overall, grain yields averaged 9.7 and 11.7 Mg ha−1 (155 and 186 bu acre−1) in 2008 and 2009, values that are consistent with national averages for both years. The average amount of stover collected for the 50% treatment was 2.6 and 4.2 Mg ha−1 for 2008 and 2009, while the 90% treatment resulted in an average removal of 5.4 and 7.4 Mg ha−1, respectively. Based on a recent literature review, both stover harvest scenarios could result in a gradual decline in TOC. However, the literature value has a large standard error, so continuation of this long-term multi-location study for several years is warranted.
Comments

This article is from Agronomy Journal 103 (2011): 288–295, doi:10.2134/agronj2010.0160s.

Access
Open
Rights
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.
Language
en
File Format
application/pdf
Citation Information
Douglas L. Karlen, Gary E. Varvel, Jane M. F. Johnson, John M. Baker, et al.. "Monitoring Soil Quality to Assess the Sustainability of Harvesting Corn Stover" Agronomy Journal Vol. 103 Iss. 1 (2011) p. 288 - 295
Available at: http://works.bepress.com/douglas_karlen/33/