Abstract
Abstract Residual herbicides applied PRE provide early season weed control, potentially avoid the need for multiple POST herbicides, and can provide additional control of herbicide-resistant weeds. Thus, field studies were conducted in 2017 and 2018 at Concord, NE, to evaluate the influence of PRE herbicides on critical time for postemergence weed removal (CTWR) in corn. The studies were arranged in a split-plot design that consisted of three herbicide regimes as main plot treatments and seven weed removal timings as subplot treatments in four replications. The herbicide regimes included no PRE herbicide, atrazine, and a premix of saflufenacil/dimethenamid-P mixed with pyroxasulfone. The weed removal timings were at V3, V6, V9, V12, and V15 corn growth stages and then plots were kept weed-free until harvest. A weed-free and nontreated control were included for comparison. The relationship between corn growth or yield, and weed removal timings in growing degree days (GDD) was described by a four-parameter log-logistic model. This model was used to estimate the critical time for weed removal based on 5% crop yield loss threshold. A delay in weed removal until the V2 to V3 corn growth stage (91 to 126 GDD) reduced corn biomass by 5% without PRE herbicide application. The CTWR started at V3 without PRE herbicide in both years. Atrazine delayed the CTWR up to V5 in both years, whereas saflufenacil/dimethenamid-P plus pyroxasulfone further delayed the CTWR up to the V10 and V8 corn growth stages in 2017 and 2018, respectively. Herbicide applied PRE particularly with multiple sites of action can delay the CTWR in corn up to a maximum growth stage of V10, and delay or reduce the need for POST weed management.
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Claims 6
Claim · model-written summary
Delaying weed removal to V2–V3 reduced corn biomass by 5% without PRE herbicide.
- Taxon
- corn
Zea mays subsp. mayse0 - Organ / stage
- V2 to V3 corn growth stagee0
- Treatment
- delay in weed removale0
- Outcome
- corn biomasse0
- Direction
- reducede0
- Value
- 5%e0
- Comparator
- without PRE herbicide applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A delay in weed removal until the V2 to V3 corn growth stage (91 to 126 GDD) reduced corn biomass by 5% without PRE herbicide application”
Claim · model-written summary
Without PRE herbicide, critical weed removal time began at V3 in both years.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- CTWRe0
- Value
- V3e0
- Qualifier
- without PRE herbicide in both yearse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The CTWR started at V3 without PRE herbicide in both years”
t0“corn”
Claim · model-written summary
Atrazine delayed critical weed removal time to V5 in both years.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- Atrazinee0
- Outcome
- CTWRe0
- Direction
- delayede0
- Value
- V5e0
- Comparator
- without PRE herbicidee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The CTWR started at V3 without PRE herbicide in both years. Atrazine delayed the CTWR up to V5 in both years”
t0“corn”
Claim · model-written summary
The herbicide premix delayed critical weed removal time to V10 in 2017.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- saflufenacil/dimethenamid-P plus pyroxasulfonee0
- Outcome
- CTWRe0
- Direction
- delayede0
- Value
- V10e0
- Qualifier
- 2017e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“saflufenacil/dimethenamid-P plus pyroxasulfone further delayed the CTWR up to the V10 and V8 corn growth stages in 2017 and 2018, respectively”
Claim · model-written summary
The herbicide premix delayed critical weed removal time to V8 in 2018.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- saflufenacil/dimethenamid-P plus pyroxasulfonee0
- Outcome
- CTWRe0
- Direction
- delayede0
- Value
- V8e0
- Qualifier
- 2018e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“saflufenacil/dimethenamid-P plus pyroxasulfone further delayed the CTWR up to the V10 and V8 corn growth stages in 2017 and 2018, respectively”
Claim · model-written summary
PRE herbicide with multiple sites of action may delay or reduce the need for POST weed management.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Herbicide applied PRE particularly with multiple sites of actione0
- Outcome
- delay or reduce the need for POST weed managemente0
- Value
- V10e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Herbicide applied PRE particularly with multiple sites of action can delay the CTWR in corn up to a maximum growth stage of V10, and delay or reduce the need for POST weed management”
The same questions in other papers
atrazine · weed · Zea mays (maize)Results differ
196 papers in the same direction as this paper · 5 in the opposite direction
- negative
- negative
- negative
198 papers more in this group
See all 202 papers →dimethenamid-P · weed · Zea mays (maize)Results agree
2 papers in the same direction as this paper
- positive
- positive
saflufenacil · weed · Zea mays (maize)Results agree
3 papers in the same direction as this paper
- positive
- positive
- positive
pyroxasulfone · weed · Zea mays (maize)Results agree
9 papers in the same direction as this paper
- positive
- positive
- positive
6 papers more in this group
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.