Abstract
The objective of this experiment was to determine the effectiveness and crop safety of glyphosate vs. alternative herbicides for weed control in glyphosate-resistant alfalfa. Glyphosate-resistant alfalfa was established at two sites in Pennsylvania in 2004 and in 2005, and herbicides were applied either PRE or POST for weed control. Data were collected on herbicide performance, alfalfa and weed yield, and forage quality. Alfalfa forage response to weed control was variable and depended on weed severity. A single or split application of glyphosate provided similar or better weed control than conventionally based herbicide programs. The most differences from weed control occurred during the first harvest and dissipated in subsequent harvests. Cumulative alfalfa yield for the establishment year of the spring seeding was 26% lower in the untreated check relative to the mean of the herbicide-treated plots in 2004; but no differences were detected in 2005. Forage quality was highest where weed content of the forage was lowest. Effective management of weeds with herbicides during alfalfa establishment can improve forage yield and quality, and weed control is particularly important when summer annual weed populations are severe and emerge with the crop.
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Claims 8
Claim · model-written summary
Alfalfa forage response to weed control varied with weed severity.
- Taxon
- Alfalfa
Medicago sativae0 - Interactor
- weede0weed
- Outcome
- forage response to weed controle0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alfalfa forage response to weed control was variable and depended on weed severity”
Claim · model-written summary
Single glyphosate application gave similar or better weed control than conventional herbicide programs.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- A single or split application of glyphosatee0
- Interactor
- weede0weed
- Outcome
- weed controle0
- Direction
- similar or bettere0
- Comparator
- conventionally based herbicide programse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A single or split application of glyphosate provided similar or better weed control than conventionally based herbicide programs”
t0“Glyphosate-Resistant Alfalfa”
Claim · model-written summary
Split glyphosate application gave similar or better weed control than conventional herbicide programs.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- split application of glyphosatee0
- Interactor
- weede0weed
- Outcome
- weed controle0
- Direction
- similar or bettere0
- Comparator
- conventionally based herbicide programse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A single or split application of glyphosate provided similar or better weed control than conventionally based herbicide programs”
t0“Glyphosate-Resistant Alfalfa”
Claim · model-written summary
Weed-control differences were greatest at first harvest and dissipated later.
- Taxon
- alfalfaMedicago sativat0
- Organ / stage
- first harveste0
- Outcome
- differences from weed controle0
- Direction
- dissipatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The most differences from weed control occurred during the first harvest and dissipated in subsequent harvests”
t0“Glyphosate-Resistant Alfalfa”
Claim · model-written summary
In 2004, untreated cumulative alfalfa yield was 26% lower than the herbicide-treated mean.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- untreated checke0
- Outcome
- Cumulative alfalfa yielde0
- Direction
- lowere0
- Value
- 26%e0
- Comparator
- mean of the herbicide-treated plotse0
- Setting
- 2004e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cumulative alfalfa yield for the establishment year of the spring seeding was 26% lower in the untreated check relative to the mean of the herbicide-treated plots in 2004”
Claim · model-written summary
In 2005, cumulative alfalfa yield did not differ between untreated and herbicide-treated plots.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- untreated checke1
- Outcome
- Cumulative alfalfa yielde1
- Direction
- no differencese0
- Comparator
- herbicide-treated plotse1
- Setting
- 2005e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but no differences were detected in 2005”
t0“Glyphosate-Resistant Alfalfa”
e1“Cumulative alfalfa yield for the establishment year of the spring seeding was 26% lower in the untreated check relative to the mean of the herbicide-treated plots in 2004”
Claim · model-written summary
Forage quality was highest with the lowest weed content.
- Taxon
- alfalfaMedicago sativat0
- Interactor
- weede0weed
- Outcome
- Forage qualitye0
- Direction
- higheste0
- Qualifier
- weed content of the forage was loweste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Forage quality was highest where weed content of the forage was lowest”
t0“Glyphosate-Resistant Alfalfa”
Claim · model-written summary
The authors conclude that herbicide weed management during alfalfa establishment can improve forage yield and quality.
- Taxon
- alfalfaMedicago sativae0
- Interactor
- weedse0weed
- Outcome
- management of weeds with herbicides during alfalfa establishmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Effective management of weeds with herbicides during alfalfa establishment can improve forage yield and quality”
The same questions in other papers
glyphosate · weed · Medicago sativa (alfalfa)Positive and negative results
6 papers in the same direction as this paper · 2 in the opposite direction · 2 reporting no difference from an alternative
- no effect
- positive
- positive
7 papers more in this group
See all 11 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.