Abstract
Field studies were conducted from 2007 to 2009 in East Lansing, MI to evaluate three residual herbicide programs, three POST herbicide application timings, and two POST herbicides in glyphosate- and glufosinate-resistant corn. Herbicide programs included a residual PRE-applied herbicide followed by (fb) POST application (residual fb POST), a residual herbicide tank-mixed with a POST herbicide (residual + POST), and a nonresidual POST. Three POST herbicide application timings included early POST (EP), mid-POST (MP), and late POST (LP) at an average corn growth stage of V3/V4, V4/V5, and V5/V6, respectively. The two POST herbicides evaluated were glyphosate and glufosinate. Control of common lambsquarters and giant foxtail was evaluated 28 d after the LP application. Glyphosate often provided greater weed control than glufosinate. The LP application resulted in greater giant foxtail control compared with the EP application timing, which may be attributed to control of late-emerging weeds. The EP application timing improved common lambsquarters control compared with the LP application timing. The residual + POST program resulted in greater weed control compared with the residual fb POST program in all years. The effect of residual herbicide program, POST herbicide, and POST application timing on corn grain yield varied by year. In 2007, the use of glyphosate resulted in higher grain yield compared with glufosinate. In 2008, corn grain yield was the highest in the PRE fb POST program and with POST applications at EP and MP. To provide the most consistent weed control and minimize the likelihood of grain yield reductions, a PRE fb POST program applied at EP or MP is recommended.
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Claims 9
Claim · model-written summary
Glyphosate often gave greater weed control than glufosinate.
- Taxon
- corn
Zea mays subsp. mayst0 - Treatment
- Glyphosatee0
- Outcome
- weed controle0
- Direction
- greatere0
- Comparator
- glufosinatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Glyphosate often provided greater weed control than glufosinate”
t0“Corn”
Claim · model-written summary
Late POST application improved giant foxtail control relative to early POST.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- LP applicatione0
- Interactor
- giant foxtaile0weed
- Outcome
- giant foxtail controle0
- Direction
- greatere0
- Comparator
- EP application timinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The LP application resulted in greater giant foxtail control compared with the EP application timing”
t0“Corn”
Claim · model-written summary
Early POST application improved common lambsquarters control relative to late POST.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- EP application timinge0
- Interactor
- common lambsquarters
Chenopodium albume0weed - Outcome
- common lambsquarters controle0
- Direction
- improvede0
- Comparator
- LP application timinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The EP application timing improved common lambsquarters control compared with the LP application timing”
t0“Corn”
Claim · model-written summary
Residual plus POST gave greater weed control than residual followed by POST in all years.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- residual + POST programe0
- Outcome
- weed controle0
- Direction
- greatere0
- Qualifier
- all yearse0
- Comparator
- residual fb POST programe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The residual + POST program resulted in greater weed control compared with the residual fb POST program in all years”
t0“Corn”
Claim · model-written summary
Herbicide program, herbicide, and timing effects on corn grain yield varied by year.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- corn grain yield varied by yeare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of residual herbicide program, POST herbicide, and POST application timing on corn grain yield varied by year”
Claim · model-written summary
In 2007 glyphosate gave higher grain yield than glufosinate.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- glyphosatee0
- Outcome
- grain yielde0
- Direction
- highere0
- Qualifier
- 2007e0
- Comparator
- glufosinatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 2007, the use of glyphosate resulted in higher grain yield compared with glufosinate”
t0“Corn”
Claim · model-written summary
In 2008 grain yield was highest under PRE followed by POST.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- PRE fb POST programe0
- Outcome
- corn grain yielde0
- Direction
- higheste0
- Qualifier
- 2008e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 2008, corn grain yield was the highest in the PRE fb POST program”
Claim · model-written summary
In 2008 grain yield was highest with early and mid POST applications.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- POST applications at EP and MPe0
- Outcome
- corn grain yielde0
- Direction
- higheste0
- Qualifier
- 2008e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 2008, corn grain yield was the highest in the PRE fb POST program and with POST applications at EP and MP”
Claim · model-written summary
The authors recommend PRE followed by POST at early or mid timing for consistent weed control and reduced yield loss risk.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- PRE fb POST program applied at EP or MPe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“To provide the most consistent weed control and minimize the likelihood of grain yield reductions, a PRE fb POST program applied at EP or MP is recommended”
t0“Corn”
The same questions in other papers
glyphosate · yield · Zea mays (maize)Results differ
41 papers in the same direction as this paper · 29 in the opposite direction · 6 reporting no difference from an alternative
- negative
- positive
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See all 77 papers →glyphosate · weed · Zea mays (maize)Positive and negative results
32 papers in the same direction as this paper · 5 in the opposite direction · 3 reporting no difference from an alternative
- positive
- positive
- negative
37 papers more in this group
See all 41 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.