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Herbicides As Harvest Aids

Published online by Cambridge University Press:  20 January 2017

James L. Griffin,
Joseph M. Boudreaux and
Donnie K. Miller
James L. Griffin*
Affiliation:
LSU AgCenter, School of Plant, Environmental, and Soil Sciences, 104 Sturgis Hall, Baton Rouge, LA 79803
Joseph M. Boudreaux
Affiliation:
LSU AgCenter, School of Plant, Environmental, and Soil Sciences, 104 Sturgis Hall, Baton Rouge, LA 79803
Donnie K. Miller
Affiliation:
LSU AgCenter, Northeast Research Station, Box 438, St. Joseph, LA 71366
*
Corresponding author's E-mail: jgriffin@agcenter.lsu.edu
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Abstract

Herbicides used as harvest aids are applied at crop maturity to desiccateweed and crop foliage. Weeds present in the harvested crop can increasemoisture content and foreign material, reducing grade and market price.Weeds can also delay the harvest operation and reduce harvest efficiency.Glyphosate can be used to desiccate weeds in glyphosate-resistant cropswithout concern for crop injury. Carfentrazone and pyraflufen-ethyl used asharvest aids can be effective in desiccating broadleaf weeds in corn andsoybean. Paraquat, although effective on grass and broadleaf weeds whenapplied late season, can cause significant crop injury if applied too early.With expanded production of early maturing soybean cultivars in themid-South (Arkansas, Louisiana, Mississippi, Missouri bootheel, and westTennessee), presence of green stems, green pods, or green leaf retention, orcombinations of these at harvest has increased. Interest in harvest aids hasshifted to use as a crop desiccant. Paraquat also is an effective soybeandesiccant, but application timing differs for indeterminate and determinatecultivars. Paraquat applied after soybean seed reached physiologicalmaturity reduced number of green stems, pods, and retained green leavespresent, allowing harvest to proceed 1 to 2 wk earlier than nontreatedsoybean. Seed moisture, foreign material, and seed damage also were reducedwhen paraquat was applied.

Keywords

Corn, Zea mays L.soybean, Glycine max (L.) MerrCrop qualitydesiccantdeterminate soybeangrade reductiongreen plant maladyharvest efficiencyindeterminate soybeanphysiological maturitypreharvest application

Information

Type
Symposium
Information
Weed Science , Volume 58 , Issue 3 , September 2010, pp. 355 - 358
Copyright
Copyright © Weed Science Society of America 

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