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Glufosinate-Resistant Corn Interference in Glufosinate-Resistant Cotton

Published online by Cambridge University Press:  20 January 2017

Scott B. Clewis ,
Walter E. Thomas ,
Wesley J. Everman  and
John W. Wilcut
Scott B. Clewis*
Affiliation:
Crop Science Department, Campus Box 7620, North Carolina State University, Raleigh, NC 27695-7620
Walter E. Thomas
Affiliation:
Crop Science Department, Campus Box 7620, North Carolina State University, Raleigh, NC 27695-7620
Wesley J. Everman
Affiliation:
Crop Science Department, Campus Box 7620, North Carolina State University, Raleigh, NC 27695-7620
John W. Wilcut
Affiliation:
Crop Science Department, Campus Box 7620, North Carolina State University, Raleigh, NC 27695-7620
*
Corresponding author's E-mail: scott_clewis@ncsu.edu
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Abstract

Studies were conducted at three locations in North Carolina in 2004 to evaluate density-dependent effects of glufosinate-resistant (GUR) corn on GUR cotton growth and lint yield. GUR corn was taller than GUR cotton as early as 11 d after planting, depending on location. A GUR corn density of 5.25 plant/m of crop row reduced late-season cotton height by 38, 43, and 43% at Clayton, Lewiston-Woodville, and Rocky Mount, NC, respectively, compared with weed-free cotton height. GUR corn dry biomass per meter of crop row and GUR corn seed biomass per meter of crop row decreased linearly with increasing GUR corn density at all locations. The relationship between GUR corn density and GUR cotton yield loss was described by the rectangular hyperbola model with the asymptote (a) constrained to 100% maximum yield loss. The estimated coefficient i (yield loss per unit density as density approaches zero) was 7, 5, and 6 at Clayton, Lewiston-Woodville, and Rocky Mount, respectively. Percentage of GUR cotton lint yield loss increased 4, 5, and 8 percentage points at Clayton, Lewiston-Woodville, and Rocky Mount, respectively, with each 500 g increase in weed biomass/m of crop row. The examined GUR corn densities had a significant effect on cotton yield but not as significant as many other problematic grass and broadleaf weeds.

Keywords

Glufosinate, corn, Zea mays L. ‘Pioneer 34A55LL’ ZEAMX, cotton, Gossypium hirsutum L., ‘FM 958LL’Competitioneconomic thresholdmodelsweed biomassweed densityplant height
Type
Weed Management — Major Crops
Information
Weed Technology , Volume 22 , Issue 2 , June 2008 , pp. 211 - 216
Copyright
Copyright © Weed Science Society of America 

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