My Account: Log In | Join | Renew
Search
Author
Title
Vol.
Issue
Year
1st Page

Abstract

 

This article in AJ

  1. Vol. 105 No. 6, p. 1498-1506
     
    Received: Apr 09, 2013
    Published: August 2, 2013


    * Corresponding author(s): sind0031@umn.edu
 View
 Download
 Alerts
 Permissions
 Share

doi:10.2134/agronj2013.0181

Agronomic Responses of Continuous Corn to Stover, Tillage, and Nitrogen Management

  1. A. J. Sindelar *a,
  2. J. A. Coultera,
  3. J. A. Lambb and
  4. J. A. Vetschc
  1. a Dep. of Agronomy and Plant Genetics, Univ. of Minnesota, 411 Borlaug Hall, 1991 Upper Buford Cir., St. Paul, MN 55108
    b Dep. of Soil, Water, and Climate, Univ. of Minnesota, 439 Borlaug Hall, 1991 Upper Buford Cir., St. Paul, MN 55108
    c Southern Research and Outreach Center, Univ. of Minnesota, 35838 120th St., Waseca, MN 56093

Abstract

Corn (Zea mays L.) stover removal for biofuel production is expected to increase in the near future. Previous research suggests stover removal is best suited to continuous corn (CC) cropping systems with reduced tillage. However, grain yields in reduced tillage CC systems in the Upper Midwest can be reduced because of cool soil temperatures restricting early-season growth. Field experiments were conducted over 3 yr at two locations in southern Minnesota with medium- and fine-textured soils to assess the agronomic responses of CC to stover removal, tillage system, and fertilizer N rate. Stover removal and/or tillage increased soil temperature by as much as 4°C, and differences among treatments generally existed until canopy closure. Corn emergence was 6% greater with stover removal in no-tillage (NT), but was not affected by stover removal in chisel-tillage (CT) and strip-tillage (ST). Stover removal increased normalized difference vegetative index (NDVI) at the eight leaf collar stage (V8) by 20 and 13% in NT and ST, respectively, but had no effect on NDVI in CT. Stover removal decreased the economically optimum N rate (EONR) by >12 and >19 kg N ha–1 in NT and ST, respectively, and increased grain yield at the EONR by 7, 9, and 6% in CT, NT, and ST, respectively. These results indicate stover removal can improve short-term agronomic productivity of moderate- to high-yielding CC on productive soils in the Upper Midwest.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © 2013. Copyright © 2013 by the American Society of Agronomy, Inc.