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.Nomenclature: Common lambsquarters, Chenopodium album L. #3 CHEAL; fall panicum, Panicum dichotomiflorum Michx. # PANDI; common ragweed, Ambrosia artemisiifolia L. # AMBEL; ivyleaf morningglory, Ipomoea hederacea (L.) Jacq. # IPOHE; horseweed, Conyza (= Erigeron) canadensis L. # ERICA; large crabgrass, Digitaria sanguinalis (L.) Scop. # DIGSA; giant foxtail, Setaria faberi Herrm. # SETFA; smooth pigweed, Amaranthus hybridus L. # AMACH; soybean, Glycine max (L.) Merr. # GLYMA.Additional index words: Critical weed removal, integrated weed management, preplant glyphosate applications.Abbreviation: DAP, days after planting; DAT, days after treatment; GRS, glyphosate-resistant soybean; POST, postemergence; RAREC, Rutgers Agricultural Research and Extension Center; UD-REC, University of Delaware Research and Education Center.
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Claims 10
Claim · model-written summary
Preplant glyphosate was essential for satisfactory annual weed control under high rainfall.
- Taxon
- Soybean
Glycine maxt0 - Treatment
- Preplant glyphosate applicatione0
- Interactor
- common annual weedse0weed
- Outcome
- control of common annual weedse0
- Direction
- satisfactorye0
- Qualifier
- rainfall was high (avg. 120 mm/mo)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“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)”
t0“Soybean”
Claim · model-written summary
The preplant treatment was less important for weed control under low rainfall.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- less importante0
- Qualifier
- rainfall was low (avg. 72 mm/mo)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but less important when rainfall was low (avg. 72 mm/mo)”
t0“Soybean”
Claim · model-written summary
Residual herbicides improved common lambsquarters control over glyphosate alone when applied early after preplant glyphosate.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- glyphosate plus residual herbicidese0
- Interactor
- common lambsquarters
Chenopodium albume0weed - Outcome
- control of common lambsquarterse0
- Direction
- improvede0
- Comparator
- glyphosate alonee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“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”
t0“Soybean”
Claim · model-written summary
Residual herbicides improved fall panicum control over glyphosate alone when applied early after preplant glyphosate.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- glyphosate plus residual herbicidese0
- Interactor
- fall panicum
Panicum dichotomiflorume0weed - Outcome
- control of common lambsquarters, fall panicume0
- Direction
- improvede0
- Comparator
- glyphosate alonee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“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”
t0“Soybean”
Claim · model-written summary
Residual herbicides improved common ragweed control over glyphosate alone when applied early after preplant glyphosate.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- glyphosate plus residual herbicidese0
- Interactor
- common ragweed
Ambrosia artemisiifoliae0weed - Outcome
- common ragweede0
- Direction
- improvede0
- Comparator
- glyphosate alonee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“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”
t0“Soybean”
Claim · model-written summary
Only glyphosate with residual herbicides achieved satisfactory full-season ivyleaf morningglory control at every application stage.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- glyphosate plus residual herbicidese0
- Interactor
- ivyleaf morningglory
Ipomoea hederaceae0weed - Outcome
- control of ivyleaf morningglorye0
- Direction
- satisfactorye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At all stages of application, satisfactory full-season control of ivyleaf morningglory was achieved only with glyphosate plus residual herbicides”
t0“Soybean”
Claim · model-written summary
Glyphosate alone or with residual herbicides gave 80 to 100% control of four named weeds.
- Taxon
- SoybeanGlycine maxt0
- Interactor
- Horseweed
Erigeron canadensise0weed - Outcome
- control varied from good to excellente0
- Value
- 80 to 100%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“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”
t0“Soybean”
Claim · model-written summary
Glyphosate alone or with residual herbicides was safe for soybean through V7.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- safe on GRSe0
- Qualifier
- up to the V7 stagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Glyphosate applied alone or with residual herbicides was safe on GRS regardless of time of application up to the V7 stage”
t0“Soybean”
Claim · model-written summary
Preplant glyphosate followed by glyphosate alone at V2 to V4 achieved the highest soybean yield.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- preplant glyphosate applications followed by glyphosate alonee0
- Outcome
- soybean yielde0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest soybean yield was consistently achieved with preplant glyphosate applications followed by glyphosate alone at the V2 to V4 stages”
t0“Soybean”
Claim · model-written summary
Preplant glyphosate followed by glyphosate plus residual herbicides through V4 achieved the highest soybean yield.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- preplant glyphosate application followed by glyphosate plus residual herbicidese0
- Outcome
- glyphosate plus residual herbicidese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a preplant glyphosate application followed by glyphosate plus residual herbicides applied from crop emergence to the V4 stage”
t0“Soybean”
The same questions in other papers
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See all 10 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.