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Title:   Author  item
                                            Johnson, Janeitem
                                            Varvel, Garyitem
                                            Stott, Dianeitem
                                            Osborne, Shannonitem
                                            Novak, Jeffreyitem
                                            Karlen, Douglasitem
                                            LAMB, JOHN - University Of Minnesotaitem
                                            Baker, John
  Submitted to: Meeting Abstract
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 10/5/2012
                                    Publication  Date: 10/5/2012
                                    Citation: Johnson, J.M., Varvel, G.E., Stott, D.E., Osborne, S.L., Novak, J.M., Karlen, D.L., Lamb, J., Baker, J.M. 2012. Corn stover management effects on soil organic carbon contents from several U.S. locations. Meeting Abstract. [abstract] 2012 Sun Grant Conference. p. 40.Interpretive Summary:
                                Technical Abstract: Corn stover is anticipated to be a major bioenergy feedstock, which is dependent upon high quality soil. Thus, the soil resource provides the foundation for building a sustainable biofuel economy. As the foundation, this resource must be safeguarded from overzealous residue harvest, which can exacerbate erosion and a loss of soil organic carbon (SOC). Furthermore, SOC can be more sensitive to residue harvest than erosion. Replicated plots established on productive soils were included in a multi-location (Iowa, Indiana, Minnesota, Nebraska, South Dakota, and South Carolina) and a multi-year study to determine the amount of corn stover needed to maintain SOC. A related objective assessed how management, climate and initial soil parameters influence stover response to stover harvest. These sites represented a range of soil types, climatic conditions, and duration of study (four to >10 years). All sites had at least three levels of stover harvest: grain only (control), maximum possible residue removal (100%) and an intermediate rate (~50%). Regression analyses were used at each site to estimate the relationship between the actual amount of stover returned and the change in SOC. These sites provided SOC and corn stover data to facilitate calculation of a minimum biomass that needs to remain on the field to avoid a SOC loss. Current data will augment literature data through multiple regression analysis to identify properties that predict resilience or sensitivity to residue harvest. This synthesis will help refine stover harvest recommendations that safeguard the soil resource and future productivity. [REAP publication]


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