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Planting Date and Glyphosate Timing on Soybean

Published online by Cambridge University Press:  20 January 2017

Jeffrey A. Coulter and
Emerson D. Nafziger
Jeffrey A. Coulter*
Affiliation:
Department of Crop Sciences, University of Illinois, Urbana, IL 61801
Emerson D. Nafziger
Affiliation:
Department of Crop Sciences, University of Illinois, Urbana, IL 61801
*
Corresponding author's E-mail: jcoulter@uiuc.edu
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Abstract

Planting date of soybean may be one factor that affects the crop's ability to compete with weeds. Field experiments were conducted over 3 yr at two locations in Illinois to determine whether planting date affects optimal weed management strategies and the critical time of weed removal (CTWR) in glyphosate-resistant soybean. Across planting dates, a PRE application of metolachlor plus metribuzin followed by a single glyphosate application at a 10- or 20-cm weed height at Monmouth or at a 20-cm weed height at Urbana was effective at protecting yield. At Monmouth, higher yields occurred with sequential glyphosate applications than with a single application in the early planting in 2 yr when weeds were removed at a height of 10 cm. Across planting dates, highest yields at Monmouth occurred with a single glyphosate application when weeds were 20 to 30 cm tall. At Urbana, the CTWR was not affected by planting date and occurred between 176 and 290 growing-degree days (GDD) after planting, corresponding to the V1 to V2 stage of soybean development and a weed height of 11 to 19 cm. Applying glyphosate near the CTWR at Urbana (10-cm weed height) required a sequential application to prevent yield loss with early and middle planting dates in 1 of 3 yr. Overall, planting date did not affect optimal weed management strategies at either location.

Keywords

Glyphosatemetolachlormetribuzinparaquatsoybean, Glycine max (L.) MerrHerbicide-resistant cropsweed interferenceABUTHCHEALPHBPUSETFA

Information

Type
Research
Information
Weed Technology , Volume 21 , Issue 2 , June 2007, pp. 359 - 366
Copyright
Copyright © Weed Science Society of America 

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