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In-Row and Between-Row Interference by Corn Modifies Annual Weed Control by Preemergence Residual Herbicide

Published online by Cambridge University Press:  20 January 2017

William W. Donald ,
William G. Johnson  and
Kelly A. Nelson
William W. Donald*
Affiliation:
USDA-ARS, 269 Agricultural Engineering Building, University of Missouri, Columbia, MO 65211
William G. Johnson
Affiliation:
USDA-ARS, 269 Agricultural Engineering Building, University of Missouri, Columbia, MO 65211
Kelly A. Nelson
Affiliation:
USDA-ARS, 269 Agricultural Engineering Building, University of Missouri, Columbia, MO 65211
*
Corresponding author's E-mail: donaldw@missouri.edu
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Abstract

The presence of row crops, such as field corn, improves herbicidal control of weeds, but the impact of crop row position on herbicide dose–response relationships for weeds is unknown. At midseason at three site-years in Missouri, total weed cover (WC) was reduced by increasing soil residual herbicide rate in a dose-dependent response and was as much as 20% lower in-row (IR) than between-row (BR). Preemergence atrazine + S-metolachlor + clopyralid + flumetsulam at different rates (0×, 0.25×, 0.5×, 0.75×, and 1×, where 1× rate was 2,240 + 1,750 + 210 + 67 g ai/ha, respectively) were applied at planting in field corn to control giant foxtail, the chief weed present, and annual broadleaf weeds, largely common waterhemp. Lower herbicide rates were required to reduce IR WC to the same extent as BR WC, but these rates varied between site-years. At all three site-years, a least squares regression equation adequately described data variability relating corn yield to IR or BR WC (or both) (i.e., Y = a + bBR2, where Y is corn yield in kg/ha, BR is BR WC [%], and a and b are coefficients).

Keywords

AtrazineclopyralidflumetsulamglyphosateS-metolachlorcommon waterhemp, Amaranthus rudis Sauer # ATATAgiant foxtail, Setaria faberi (L.) Beauv. # SETFAcorn, Zea mays (L.) # ZEAMX, ‘Pioneer 33G28’Band herbicide applicationbandingcompetitionherbicidereduced rate herbicideweedAMBELATATAPOLPEPOLPYSETFAXANSTZEAMXBR, between-rowIR, in-rowWC, weed cover
Type
Research
Information
Weed Technology , Volume 18 , Issue 3 , September 2004 , pp. 497 - 504
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Current address: 1155 Lilly Hall, Purdue University, West Lafayette, IN 47907

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