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Evaluation of Corn (Zea mays L.) Yield-loss Estimations by WeedSOFT® in the North Central Region

Published online by Cambridge University Press:  20 January 2017

Andrew A. Schmidt ,
William G. Johnson ,
David A. Mortensen ,
Alex R. Martin ,
Anita Dille ,
Dallas E. Peterson ,
Corey Guza ,
James J. Kells ,
Ryan D. Lins  and
Chris M. Boerboom
...Show all authors
Andrew A. Schmidt
Affiliation:
Department of Agronomy, University of Missouri, Columbia, MO 65211
William G. Johnson*
Affiliation:
Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907-1155
David A. Mortensen
Affiliation:
Department of Crop and Soil Sciences, Penn State University, University Park, PA 16802
Alex R. Martin
Affiliation:
Department of Agronomy and Horticulture, University of Nebraska, Lincoln, NE 68583-0915
Anita Dille
Affiliation:
Department of Agronomy, Kansas State University, Manhattan, KS 66506
Dallas E. Peterson
Affiliation:
Department of Agronomy, Kansas State University, Manhattan, KS 66506
Corey Guza
Affiliation:
Department of Crop and Soil Sciences, Michigan State University, East Lansing, MI 48824-1325
James J. Kells
Affiliation:
Department of Crop and Soil Sciences, Michigan State University, East Lansing, MI 48824-1325
Ryan D. Lins
Affiliation:
Department of Agronomy, University of Wisconsin, Madison, WI 53706
Chris M. Boerboom
Affiliation:
Department of Agronomy, University of Wisconsin, Madison, WI 53706
Christy L. Sprague
Affiliation:
Department of Crop and Soil Science, University of Illinois, Urbana, IL 61801
Stevan Z. Knezevic
Affiliation:
Department of Agronomy, University of Nebraska, Concorde, NE 68728-2828
Fred W. Roeth
Affiliation:
Department of Agronomy, University of Nebraska, Clay Center, NE 68933
Case R. Medlin
Affiliation:
Department of Plant and Soil Sciences, Oklahoma State University, Stillwater, OK 74078-6028
Thomas T. Bauman
Affiliation:
Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907-1155
*
Corresponding author's E-mail: wgj@purdue.edu
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Abstract

Field studies were conducted in 2000 and 2001 to evaluate corn yield-loss predictions generated by WeedSOFT, a computerized weed management decision aid. Conventional tillage practices were used to produce corn in 76-cm rows in Illinois, Indiana, Kansas, Michigan, Missouri, Nebraska, and Wisconsin. A total of 21 site-years from these seven states were evaluated in this study. At 4 wk after planting, weed densities and size, crop-growth stage, estimated weed-free yield, and environmental conditions at the time of application were entered into WeedSOFT to generate POST treatments ranked by percent maximum yield (PMY). POST treatments were chosen with yield losses ranging from 0 to 20%. Data were subjected to linear regression analysis by state and pooled over all states to determine the relationship between actual and predicted yield loss. A slope value equal to one implies perfect agreement between actual and predicted yield loss. Slope value estimates for Illinois and Missouri were equal to one. Actual yield losses were higher than the software predicted in Kansas and lower than predicted in Michigan, Nebraska, and Wisconsin. Slope value estimate from a data set containing all site years was equal to one. This research demonstrated that variability in yield-loss predictions occurred at sites that contained a high density of a single weed specie (>100/m2) regardless of its competitive index (CI); at sites with a predominant broadleaf weed with a CI greater than five, such as Palmer amaranth, giant ragweed, common sunflower, and common cocklebur; and at sites that experience moderate to severe drought stress.

Keywords

common cocklebur, Xanthium strumarium L. # XANSTcommon lambsquarters, Chenopodium album L. # CHEALcommon ragweed, Ambrosia artemisiifolia L. # AMBELcommon sunflower, Helianthus annuus L. # HELANcommon waterhemp, Amaranthus rudis Sauer. # AMATAcorn, Zea mays L. # ZEAMXgreen foxtail, Setaria viridis (L.) Beauv. # SETVIgiant foxtail, Setaria faberi Herrm. # SETFAgiant ragweed, Ambrosia trifida L. # AMBTRfall panicum, Panicum dichotomiflorum Michx. # PANDImorningglory spp., Ipomoea spp. # IPOSSPalmer amaranth, Amaranthus palmeri S. Wats. # AMAPApitted morningglory, Ipomoea lacunosa L. # IPOLAprickly sida, Sida spinosa L. # SIDSPredroot pigweed, Amaranthus retroflexus L. # AMAREvelvetleaf, Abutilon theophrasti Medicus # ABUTHVenice mallow, Hibiscus trionum L. # HIBTRBioeconomic modeldecision support systemherbicide decision aidCI, competitive indexDSS, decision support systemHPMY, highest percent maximum yieldPMY, percent maximum yieldTCL, total competitive load
Type
Extension/Outreach
Information
Weed Technology , Volume 19 , Issue 4 , December 2005 , pp. 1056 - 1064
Copyright
Copyright © Weed Science Society of America 

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