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ARS Home Midwest Area Ames, Iowa National Laboratory for Agriculture and The Environment Soil, Water & Air Resources Research Research Publications at this Location





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Title:   Author  item
                                            Karlen, Douglasitem
                                            BIRRELL, STUART - Iowa State Universityitem
                                            Johnson, Janeitem
                                            Osborne, Shannonitem
                                            SCHUMACHER, THOMAS - South Dakota State Universityitem
                                            Varvel, Garyitem
                                            FERGUSON, RICHARD - University Of Nebraskaitem
                                            Novak, Jeffreyitem
                                            FREDRICK, JAMES - Clemson Universityitem
                                            Baker, Johnitem
                                            LAMB, JOHN - University Of Minnesotaitem
                                            Adler, Paulitem
                                            ROTH, GREG - Pennsylvania State Universityitem
                                            NAFZIGER, EMERSON - University Of Illinois
  Submitted to: Meeting Proceedings
                                    Publication Type: Proceedings
                                    Publication Acceptance Date: 8/1/2012
                                    Publication  Date: 10/2/2012
                                    Citation: Karlen, D.L., Birrell, S.J., Johnson, J.M., Osborne, S.L., Schumacher, T.E., Varvel, G.E., Ferguson, R.B., Novak, J.M., Fredrick, J.R., Baker, J.M., Lamb, J.A., Adler, P.R., Roth, G.W., Nafziger, E.D. 2012. Corn grain, stover yield, and nutrient removal validations at regional partnership sites. Proceedings of the Sun Grant National COnference, October 2-5, 2012, New Orleans, LA. Available: http://sungrant.tennessee.edu/NatConference/ConferenceProceedings/.Interpretive Summary:
                                Technical Abstract: Corn (Zea mays, L.) stover, the aboveground material left in fields after corn grain harvest, has been selected as a major feedstock by at least four companies investing in cellulosic bioenergy. Estimates of the amount of stover that could be sustainably harvested have varied greatly depending upon the limiting factors being considered. This presentation will review the four-year Sun Grant Regional Partnership corn production trials and supporting ARS and university studies at seven U.S. locations contributing to the DOE Knowledge Discovery Framework (KDF) database. Seasonal variation in weather patterns caused yields to differ substantially among sites and years. To quantify this site-specific variation, data from each site will be examined relative to National Agricultural Statistics Service (NASS) yield projections for each area. In addition to grain and stover yield, the quantity of N, P, and K removed by each crop will also be examined. To sustain soil resources within the Corn Belt, preliminary analyses suggest that stover should not be harvested if average grain yields are less than 11 Mg ha-1 (175 bu ac-1). Although non-irrigated eastern and western sites may not achieve these yield levels, corn can still be part of an overall landscape approach for sustainable feedstock production. Furthermore, producers with consistently high yields (> 200 bu ac-1) may be able to sustainably harvest stover by decreasing their tillage intensity, thus also decreasing fuel usage and preserving rhizosphere carbon and/or soil structure benefits often attributed to no-till production systems.


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