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Row Spacing Influences the Critical Timing for Weed Removal in Soybean (Glycine max)

Published online by Cambridge University Press:  20 January 2017

Stevan Z. Knezevic ,
Sean P. Evans  and
Mike Mainz
Stevan Z. Knezevic*
Affiliation:
Haskell Agricultural Laboratory, University of Nebraska, 57905 866 Road, Concord, NE 68728-2828
Sean P. Evans
Affiliation:
Haskell Agricultural Laboratory, University of Nebraska, 57905 866 Road, Concord, NE 68728-2828
Mike Mainz
Affiliation:
Haskell Agricultural Laboratory, University of Nebraska, 57905 866 Road, Concord, NE 68728-2828
*
Corresponding author's E-mail: sknezevic2@unl.edu
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Abstract

Row spacing affects the time of canopy closure, thus influencing the growth and development of both crop and weeds. Field studies were conducted in 1999, 2000, and 2001 at Mead, NE, and 2000 and 2001 at Concord in eastern Nebraska to determine the effects of three row spacings (19, 38, and 76 cm) on the critical time for weed removal (CTWR) in dryland soybean. A three-parameter logistic equation was fit to data relating relative crop yield to increasing duration of weed presence. In general, earliest CTWR occurred in the 76-cm rows, and coincided with the first trifoliate stage of soybean. Latest CTWR occurred in the 19-cm rows and coincided with the third trifoliate. The CTWR in 38-cm rows occurred at the second trifoliate. Practical implications are that planting soybean in wide rows reduces early-season crop tolerance to weeds requiring earlier weed management programs than in narrower rows.

Keywords

Glyphosate-resistant soybeanGlycine max (L.) MerrIntegrated weed managementrow spacingtiming of removalweed interferenceCPWC, critical period of weed controlCTWR, critical time for weed removalDAE, days after emergenceDM, dry matterGDD, growing degree daysHTCs, herbicide tolerant cropsIWM, integrated weed managementPOST, postemergence
Type
Research
Information
Weed Technology , Volume 17 , Issue 4 , December 2003 , pp. 666 - 673
Copyright
Copyright © Weed Science Society of America 

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