Abstract
Palmer amaranth is the most troublesome weed in agronomic crops in United States. Therefore, an integrated weed management approach is necessary to successfully manage this weed. The use of residual pre-emergence (PRE) herbicide applied at planting can delays the is one of the critical time of Palmer amaranth removal (CTPAR) giving farmers more time to prepare the weed control tactics and to preventing an unacceptable yield loss in soybean due to Palmer amaranth competition. Field experiments were conducted in 2018 and 2019 in a grower’s field infested with GR Palmer amaranth near Carleton, Nebraska, to determine the CTPAR in soybean affected by residual pre-emergence (PRE) herbicides compared with the no PRE herbicide in southcentral Nebraska. Results demonstrated that ). In absence of a PRE herbicide, the CTPAR at 5% soybean yield loss occurred at V1 and V6 soybean growth stages, in 2018 and 2019, respectively. When flumioxazin was applied alone, the CTPAR was delayed until V3 and V6 soybean growth stages compared with V2 and R1 soybean growth stages when the flumioxazin/metribuzin/pyroxasulfone premix was applied, in 2018 and 2019, respectively. Late-emerged Palmer amaranth plants and plants that survived POST applications are usually ignored by weed management programs based on yield loss once they normally do not cause an unacceptable yield loss. However, those plants can grow and produce seed, thus, replenishing the soil seedbank and increasing the chances for evolution of herbicide-resistant biotypes. Field experiments were conducted in a grower’s field infested with GR Palmer amaranth near Carleton, NE, in 2018 and 2019 to evaluate the effects of single or sequential late season applications of labeled POST herbicides such as acifluorfen, dicamba, fomesafen/fluthiacet-methyl, glyphosate, and lactofen on GR Palmer amaranth control, density, biomass, seed production, and fecundity as well as grain yield of dicamba/glyphosate-resistant (DGR) soybean. Dicamba applied at V4 soybean growth stage (SGS) or in sequential applications at V4 followed by R1 or R3 SGS provided 86% to 97% control, reduced Palmer amaranth seed production in the range of 557 to 2,911 seeds per female plant and secured the highest soybean yield during both years of the study. Advisor: Amit J. Jhala
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Claims 5
Claim · model-written summary
Without PRE herbicide, 5% soybean yield loss occurred at V1 in 2018 and V6 in 2019.
- Taxon
- soybean
Glycine maxe0 - Treatment
- absence of a PRE herbicidee0
- Interactor
- PALMER AMARANTHt0weed
- Outcome
- CTPAR at 5% soybean yield losse0
- Value
- V1 and V6 soybean growth stagese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In absence of a PRE herbicide, the CTPAR at 5% soybean yield loss occurred at V1 and V6 soybean growth stages, in 2018 and 2019, respectively.”
t0“CRITICAL PERIOD OF PALMER AMARANTH REMOVAL”
Claim · model-written summary
Flumioxazin alone delayed the critical removal period to V3 in 2018 and V6 in 2019.
- Taxon
- soybeanGlycine maxe0
- Treatment
- flumioxazine0
- Interactor
- PALMER AMARANTHt0weed
- Outcome
- CTPARe0
- Direction
- delayede0
- Value
- V3 and V6 soybean growth stagese0
- Comparator
- flumioxazin/metribuzin/pyroxasulfone premixe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When flumioxazin was applied alone, the CTPAR was delayed until V3 and V6 soybean growth stages compared with V2 and R1 soybean growth stages when the flumioxazin/metribuzin/pyroxasulfone premix was applied, in 2018 and 2019, respectively.”
t0“CRITICAL PERIOD OF PALMER AMARANTH REMOVAL”
Claim · model-written summary
Dicamba at V4 or sequentially at V4 followed by R1 or R3 controlled Palmer amaranth by 86% to 97%.
- Taxon
- soybeanGlycine maxe0
- Treatment
- Dicamba applied at V4 soybean growth stage (SGS) or in sequential applications at V4 followed by R1 or R3 SGSe0
- Interactor
- Palmer amaranthe0weed
- Outcome
- controle0
- Direction
- controle0
- Value
- 86% to 97%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dicamba applied at V4 soybean growth stage (SGS) or in sequential applications at V4 followed by R1 or R3 SGS provided 86% to 97% control, reduced Palmer amaranth seed production in the range of 557 to 2,911 seeds per female plant and secured the highest soybean yield during both years of the study.”
Claim · model-written summary
The dicamba applications reduced Palmer amaranth seed production to 557 to 2,911 seeds per female plant.
- Taxon
- soybeanGlycine maxe0
- Treatment
- Dicamba applied at V4 soybean growth stage (SGS) or in sequential applications at V4 followed by R1 or R3 SGSe0
- Interactor
- Palmer amaranthe0weed
- Outcome
- Palmer amaranth seed productione0
- Direction
- reducede0
- Value
- 557 to 2,911 seeds per female plante0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dicamba applied at V4 soybean growth stage (SGS) or in sequential applications at V4 followed by R1 or R3 SGS provided 86% to 97% control, reduced Palmer amaranth seed production in the range of 557 to 2,911 seeds per female plant and secured the highest soybean yield during both years of the study.”
Claim · model-written summary
The dicamba applications secured the highest soybean yield across both years.
- Taxon
- soybeanGlycine maxe0
- Treatment
- Dicamba applied at V4 soybean growth stage (SGS) or in sequential applications at V4 followed by R1 or R3 SGSe0
- Interactor
- Palmer amaranthe0weed
- Outcome
- soybean yielde0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dicamba applied at V4 soybean growth stage (SGS) or in sequential applications at V4 followed by R1 or R3 SGS provided 86% to 97% control, reduced Palmer amaranth seed production in the range of 557 to 2,911 seeds per female plant and secured the highest soybean yield during both years of the study.”
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See all 121 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.