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Glyphosate in Full-Season No-Till Glyphosate-Resistant Soybean: Role of Preplant Applications and Residual Herbicides

Published online by Cambridge University Press:  20 January 2017

Mark J. Vangessel ,
Albert O. Ayeni  and
Bradley A. Majek
Mark J. Vangessel
Affiliation:
University of Delaware Research and Education Center, Road 6, P.O. Box 48, Georgetown, DE 19947
Albert O. Ayeni*
Affiliation:
Rutgers Agricultural Research and Extension Center, Rutgers University, 121 Northville Road, Bridgeton, NJ 08302
Bradley A. Majek
Affiliation:
Rutgers Agricultural Research and Extension Center, Rutgers University, 121 Northville Road, Bridgeton, NJ 08302
*
Corresponding author's E-mail: [email protected].
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Abstract

The efficacy of glyphosate applied alone or in combination with residual herbicides in full-season no-till glyphosate-resistant soybean (GRS) was investigated in New Jersey and Delaware on sandy drought-prone soils. Treatments were in a two- by two- by five-factorial arrangement laid out in three or four randomized complete blocks. The factors investigated were—two preplant glyphosate applications: preplant glyphosate applications or no preplant glyphosate applications; two herbicide treatments: 0.8 kg ae/ha glyphosate alone or 0.8 kg/ha glyphosate tank-mixed with 0.6 kg ai/ha clomazone plus 0.07 kg ai/ha imazethapyr; and herbicide application at five GRS growth stages: at cracking or one of the four times between the V1 and V7 stages. Preplant glyphosate application for the control of emerged weeds was essential for satisfactory control of common annual weeds with glyphosate alone or glyphosate combined with residual herbicides when rainfall was high (avg. 120 mm/mo), but less important when rainfall was low (avg. 72 mm/mo). Compared to glyphosate alone, glyphosate plus residual herbicides improved the control of common lambsquarters, fall panicum, and common ragweed, when applied at cracking or at the V1 stage and preceded by preplant glyphosate applications. At all stages of application, satisfactory full-season control of ivyleaf morningglory was achieved only with glyphosate plus residual herbicides. Horseweed, large crabgrass, giant foxtail, or smooth pigweed control varied from good to excellent (80 to 100%) at all stages of application of glyphosate alone or with residual herbicides. Glyphosate applied alone or with residual herbicides was safe on GRS regardless of time of application up to the V7 stage. The highest soybean yield was consistently achieved with preplant glyphosate applications followed by glyphosate alone at the V2 to V4 stages or a preplant glyphosate application followed by glyphosate plus residual herbicides applied from crop emergence to the V4 stage.

Keywords

Common lambsquarters, Chenopodium album L. # CHEALfall panicum, Panicum dichotomiflorum Michx. # PANDIcommon ragweed, Ambrosia artemisiifolia L. # AMBELivyleaf morningglory, Ipomoea hederacea (L.) Jacq. # IPOHEhorseweed, Conyza (= Erigeron) canadensis L. # ERICAlarge crabgrass, Digitaria sanguinalis (L.) Scop. # DIGSAgiant foxtail, Setaria faberi Herrm. # SETFAsmooth pigweed, Amaranthus hybridus L. # AMACHsoybean, Glycine max (L.) Merr. # GLYMACritical weed removalintegrated weed managementpreplant glyphosate applicationsDAP, days after plantingDAT, days after treatmentGRS, glyphosate-resistant soybeanPOST, postemergenceRAREC, Rutgers Agricultural Research and Extension CenterUD-REC, University of Delaware Research and Education Center
Type
Research
Information
Weed Technology , Volume 15 , Issue 4 , December 2001 , pp. 714 - 724
Copyright
Copyright © Weed Science Society of America 

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