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United States Department of Agriculture

Agricultural Research Service

Research Project: SOIL MANAGEMENT FOR ENHANCED AGRICULTURAL PRODUCTIVITY AND SUSTAINABLE BIOFUEL FEEDSTOCK PRODUCTION

Location: Soil, Water & Air Resources Research

Title: Corn grain, stover yield and nutrient removal validations at regional partnership sites)

Author
item Karlen, Douglas - Doug
item Birrell, Stuart
item Johnson, Jane
item Osborne, Shannon
item Schumacher, Thomas
item Varvel, Gary
item Ferguson, Richard
item Novak, Jeffrey - Jeff
item Fredrick, James
item Baker, John
item Lamb, John
item Adler, Paul
item Roth, Greg
item Nafziger, Emerson

Submitted to: Meeting Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 10/2/2012
Publication Date: 1/15/2013
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., Nafziger, E.D. 2013. 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 has been identified as a major feedstock for cellulosic bioenergy. This report summarizes grain and stover yield as well as N, P, and K removal at several Sun Grant Regional Partnership (SGRP) sites. National Agricultural Statistical Service (NASS) grain yields were used to assess the relevancy of plot-scale yields with county averages. Seasonal variation in weather patterns caused yields to differ substantially among sites and years. Nutrient removal estimates were significantly influenced by the sampling method (i.e. analysis of hand samples between physiologic maturity and grain harvest versus stover collected during the harvest operation). Based on ancillary studies that indicate corn stover should not be harvested if average grain yields are less than 175 bu ac-1 (11 Mg ha-1), these studies show that non-irrigated SGRP sites with the highest potential for sustainable corn stover harvest were located between -91º and -93º west longitude. The more eastern (-78º w longitude) and western (-96º w longitude) sites did not have sufficient yield for sustainable routine stover harvest, although with good management, corn could still be part of an overall landscape approach for sustainable feedstock production in those areas. For producers with consistently high yields (i.e. > 200 bu ac-1) and where residue management may actually be a major problem (e.g. in irrigated areas), moderate stover harvest may actually decrease fuel use and save additional energy by reducing the amount of tillage needed to prepare subsequent seedbeds. Less intensive tillage could also preserve rhizosphere carbon and/or soil structure benefits often attributed to no-till systems.

Last Modified: 8/24/2016
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