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Influence of Environment on Corn (Zea mays) Tolerance to Sethoxydim

Published online by Cambridge University Press:  12 June 2017

James A. Fawcett ,
Robert G. Harvey ,
W. Eugene Arnold ,
Thomas T. Bauman ,
Charlotte V. Eberlein ,
James J. Kells ,
Loren J. Moshier ,
Fred W. Slife  and
Robert G. Wilson
James A. Fawcett
Affiliation:
Dep. Agron., Univ. Wisconsin, Madison, WI 53706
Robert G. Harvey
Affiliation:
Dep. Agron., Univ. Wisconsin, Madison, WI 53706
W. Eugene Arnold
Affiliation:
Plant Sci. Dep., South Dakota State Univ., Brookings, SD 57006
Thomas T. Bauman
Affiliation:
Botany Dep., Purdue Univ., W. Lafayette, IN 47907
Charlotte V. Eberlein
Affiliation:
Dep. Agron., Univ. Minnesota, St. Paul, MN 55108
James J. Kells
Affiliation:
Dep. Crop & Soil Sci., Michigan State Univ., E. Lansing, MI 48824
Loren J. Moshier
Affiliation:
Dep. Agron., Kansas State Univ., Manhattan, KS 66506
Fred W. Slife
Affiliation:
Agron. Dep., Univ. Illinois, Urbana, IL 61801
Robert G. Wilson
Affiliation:
Dep. Agron., Univ. Nebraska, Scottsbluff, NE 69361
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Abstract

Corn (Zea mays L. ‘Pioneer 3732′) showed little to no injury following the postemergence-directed application of sethoxydim {2-[1-(ethoxyimino)butyl]-5-[2-(ethylthio) propyl]-3-hydroxy-2-cyclohexen-1-one} plus crop oil concentrate (COC) at 56 g/ha plus 1.25% (v/v) at nine locations across Midwestern U.S. in 1984 and 1985. Little corn injury also occurred for the postemergence-directed application of sethoxydim plus COC at 110 g/ha plus 1.25% (v/v) at most locations in both years. Considerable variation in tolerance was seen across locations for over-the-top applications of sethoxydim at all rates tested and for the directed application at 220 g/ha. Although corn at most locations showed no yield reduction with the over-the-top application of sethoxydim plus COC at 56 g/ha plus 1.25% (v/v), a 70% yield reduction occurred in one location in one year. For an over-the-top application of sethoxydim plus COC at 110 g/ha plus 1.25% (v/v), yields ranged from 3 to 95% of the untreated check in 1984, and from 3 to 88% in 1985. Stand reductions from an over-the-top application of sethoxydim plus COC at 220 g/ha plus 1.25% (v/v) ranged from 0 to 99%. A significant negative correlation was found between yield of corn treated over the top with sethoxydim and precipitation on the day of application and in the week following application. Air temperature on the day of application was positively correlated with corn injury from over-the-top and directed sethoxydim applications, but no correlation existed between percent relative humidity and corn injury. Open pan evaporation and solar radiation before and after application were not correlated with corn injury from sethoxydim.

Keywords

Postemergence directedair temperaturerelative humidityprecipitationsoil moisturesolar radiationopen pan evaporation
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 35 , Issue 4 , July 1987 , pp. 568 - 575
Copyright
Copyright © 1987 by the Weed Science Society of America 

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References

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