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Influence of Herbicide Application Rate, Timing, and Interrow Cultivation on Weed Control and Corn (Zea mays) Yield in Glufosinate-Resistant and Glyphosate-Resistant Corn

Published online by Cambridge University Press:  12 June 2017

Brent E. Tharp  and
James J. Kells
Brent E. Tharp
Affiliation:
Department of Crop and Soil Science, Michigan State University, East Lansing, MI 48824
James J. Kells*
Affiliation:
Department of Crop and Soil Science, Michigan State University, East Lansing, MI 48824
*
Corresponding author's E-mail: kells@pilot.msu.edu.
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Abstract

Field trials were conducted in 1996 and 1997 to determine the influence of glufosinate and glyphosate application rates, application timings, and interrow cultivation on weed control and corn yield. Glufosinate-ammonium rates ranged from 0.18 to 0.41 kg ai/ha, while rates for the isopropylamine salt of glyphosate ranged from 0.21 to 0.84 kg ae/ha. Increasing rates of glufosinate and glyphosate often improved weed control. Control of many of the weed species was improved by delaying herbicide application timing. Weed control was most consistent from late postemergence (LPOST) applications of glufosinate at 0.41 kg ai/ha or glyphosate at 0.84 kg ae/ha. Corn yields were reduced due to incomplete weed control when the lowest rate of glufosinate was applied. Weed control from early postemergence (EPOST) glufosinate and glyphosate applications followed by cultivation was similar to weed control from LPOST glufosinate and glyphosate applications without cultivation. Interrow cultivation following glufosinate or glyphosate application did not affect corn yield.

Keywords

Glufosinate, 2-amino-4-(hydroxymethylphosphinyl)butanoic acidglyphosate, N-(phosphonomethyl)glycinecorn, Zea mays L. ‘DK 493GR.’Herbicide-tolerant cropsAbutilon theophrastiAmaranthus retroflexusChenopodium albumSetaria faberiZea maysABUTHAMARECHEALSETFAEPOST, early postemergenceLPOST, late postemergencePRE, preemergence
Type
Research
Information
Weed Technology , Volume 13 , Issue 4 , December 1999 , pp. 807 - 813
Copyright
Copyright © 1999 by the Weed Science Society of America 

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