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Article
Ten-Year Assessment Encourages No-Till for Corn Grain and Stover Harvest
Agricultural & Environmental Letters
  • John F. Obrycki, United States Department of Agriculture
  • John L. Kovar, United States Department of Agriculture
  • Douglas L. Karlen, United States Department of Agriculture
  • Stuart J. Birrell, Iowa State University
Document Type
Article
Publication Version
Published Version
Publication Date
9-20-2018
DOI
10.2134/ael2018.06.0034
Abstract

Developing a bio-economy by harvesting crop residues from highly productive corn (Zea mays L.) cropping systems requires science-based management decisions to maintain or enhance grain yield and soil, water, and air resources. Which tillage and stover harvest practices are best for accomplishing these goals? Continuous corn grain yield response to either no-till or chisel plowing with two stover harvest rates (3.4 or 5.1 Mg ha−1 yr−1) was evaluated for 10 yr in central Iowa. Each tillage and stover removal combination was replicated four times. Year-to-year variation affected grain yield more than tillage practice (0.2 Mg ha−1) or stover removal (0.1 Mg ha−1). Grain yields were not statistically different (p = 0.33) between tillage systems. Including machinery costs made return on investment for chisel plow and no-till equivalent even though no-till yields were numerically lower. Net stover income per megagram was US$2 to $4 greater at the 3.4 versus 5.1 Mg ha−1 harvest rate because of more efficient harvesting. Among the four practices, no-till with 3.4 Mg ha−1 stover harvest met multiple goals, including providing acceptable corn grain yields, positive net income per megagram stover, and sufficient residues to protect the soil.

Comments

This article is published as Obrycki, John F., John L. Kovar, Douglas L. Karlen, and Stuart J. Birrell. "Ten-Year Assessment Encourages No-Till for Corn Grain and Stover Harvest." Agricultural & Environmental Letters 3, no. 1 (2018). DOI: 10.2134/ael2018.06.0034.

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
John F. Obrycki, John L. Kovar, Douglas L. Karlen and Stuart J. Birrell. "Ten-Year Assessment Encourages No-Till for Corn Grain and Stover Harvest" Agricultural & Environmental Letters Vol. 3 Iss. 1 (2018) p. 180034
Available at: http://works.bepress.com/stuart_birrell/62/