Abstract
The control of quackgrass (Agropyron repens (L.) Beauv.) using glyphosate applied with either a conventional sprayer or a rope wick applicator, each followed by several levels of tillage, was studied in 1983, 1984 and 1985. With the conventional sprayer, glyphosate was either applied alone or with ammonium sulfate (3.4 kg ha −1 ) and the surfactant, nonylphenoxy polyethoxy ethanol (0.5% vol/vol of spray volume). Applications made with the sprayer were more effective in reducing quackgrass culm density than those made with the rope wick applicator. The density of quackgrass culms declined as the number of tillage operations increased from one, performed at 115 or more days after herbicide application (DAT), to three performed at 5–8, 39–60 and 115 or more DAT. Doubling the rate of sprayer-applied glyphosate, from 0.8 to 1.7 kg acid equivalent ha −1 , did not result in a reduction in the density of quackgrass culms. However, in 1 of the 2 years in which comparisons were made, both of these treatments reduced the density of quackgrass culms more than a similar application of glyphosate alone at 0.5 kg ha −1 . The addition of ammonium sulfate and surfactant to glyphosate enhanced quackgrass control only at the 0.5 kg ha −1 rate and only in 1 of 2 yr at that rate. Glyphosate, applied at 0.5 kg ha −1 with the sprayer, and followed by three tillage operations consistently reduced the density of quackgrass culms by 95% or more. Both the herbicide and the tillage treatments resulted in increases in the yield of barley seeded the following year. In 2 of the 3 years, barley yields, averaged across tillage treatments, were greater in the plots where the sprayer had been used to apply the glyphosate treatments than in the plots where the rope wick applicator had been used. Barley yields decreased as the quackgrass culm density increased, although other factors seemed to have influenced the yields in one of the years.Key words: Glyphosate, tillage, barley, quackgrass, fallow
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 9
Claim · model-written summary
Sprayer-applied glyphosate reduced quackgrass culm density more than rope wick applicator application.
Verbatim
t0“CONTROL OF QUACKGRASS IN FALLOW FROM SEVERAL GLYPHOSATE PLUS TILLAGE TREATMENTS AND ITS EFFECT ON THE SUBSEQUENT YIELD OF BARLEY”
e1“Applications made with the sprayer were more effective in reducing quackgrass culm density than those made with the rope wick applicator”
Claim · model-written summary
Quackgrass culm density declined as the number of tillage operations increased from one.
Verbatim
t0“CONTROL OF QUACKGRASS IN FALLOW FROM SEVERAL GLYPHOSATE PLUS TILLAGE TREATMENTS AND ITS EFFECT ON THE SUBSEQUENT YIELD OF BARLEY”
e1“The density of quackgrass culms declined as the number of tillage operations increased from one”
Claim · model-written summary
Doubling the sprayer-applied glyphosate rate from 0.8 kg acid equivalent ha -1 did not reduce quackgrass culm density.
Verbatim
t0“CONTROL OF QUACKGRASS IN FALLOW FROM SEVERAL GLYPHOSATE PLUS TILLAGE TREATMENTS AND ITS EFFECT ON THE SUBSEQUENT YIELD OF BARLEY”
e1“Doubling the rate of sprayer-applied glyphosate, from 0.8 to 1.7 kg acid equivalent ha −1 , did not result in a reduction in the density of quackgrass culms”
Claim · model-written summary
In 1 of 2 years, both treatments reduced quackgrass culm density more than glyphosate alone at 0.5 kg ha -1.
Verbatim
t0“CONTROL OF QUACKGRASS IN FALLOW FROM SEVERAL GLYPHOSATE PLUS TILLAGE TREATMENTS AND ITS EFFECT ON THE SUBSEQUENT YIELD OF BARLEY”
e1“in 1 of the 2 years in which comparisons were made, both of these treatments reduced the density of quackgrass culms more than a similar application of glyphosate alone at 0.5 kg ha −1”
Claim · model-written summary
Adding ammonium sulfate and surfactant to glyphosate enhanced quackgrass control only at 0.5 kg ha -1 and in 1 of 2 years.
Verbatim
t0“CONTROL OF QUACKGRASS IN FALLOW FROM SEVERAL GLYPHOSATE PLUS TILLAGE TREATMENTS AND ITS EFFECT ON THE SUBSEQUENT YIELD OF BARLEY”
e1“The addition of ammonium sulfate and surfactant to glyphosate enhanced quackgrass control only at the 0.5 kg ha −1 rate and only in 1 of 2 yr at that rate”
Claim · model-written summary
Glyphosate at 0.5 kg ha -1 with the sprayer followed by three tillage operations reduced quackgrass culm density by 95% or more.
- Taxon
- quackgrasse1
- Treatment
- Glyphosate, applied at 0.5 kg ha −1 with the sprayer, and followed by three tillage operationse1
- Outcome
- density of quackgrass culmse1
- Direction
- reducede1
- Value
- 95% or moree1
Not reportedComparator
Verbatim
t0“CONTROL OF QUACKGRASS IN FALLOW FROM SEVERAL GLYPHOSATE PLUS TILLAGE TREATMENTS AND ITS EFFECT ON THE SUBSEQUENT YIELD OF BARLEY”
e1“Glyphosate, applied at 0.5 kg ha −1 with the sprayer, and followed by three tillage operations consistently reduced the density of quackgrass culms by 95% or more”
Claim · model-written summary
Herbicide and tillage treatments increased the yield of barley seeded the following year.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaree1 - Treatment
- herbicide and the tillage treatmentse1
- Outcome
- yield of barleye1
- Direction
- increasese1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
t0“CONTROL OF QUACKGRASS IN FALLOW FROM SEVERAL GLYPHOSATE PLUS TILLAGE TREATMENTS AND ITS EFFECT ON THE SUBSEQUENT YIELD OF BARLEY”
e1“Both the herbicide and the tillage treatments resulted in increases in the yield of barley seeded the following year”
Claim · model-written summary
In 2 of 3 years, barley yields were greater where the sprayer applied glyphosate than where the rope wick applicator was used.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- the sprayer had been used to apply the glyphosate treatmentse1
- Outcome
- barley yieldse1
- Direction
- greatere1
- Qualifier
- In 2 of the 3 yearse1
- Comparator
- the rope wick applicator had been usede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“CONTROL OF QUACKGRASS IN FALLOW FROM SEVERAL GLYPHOSATE PLUS TILLAGE TREATMENTS AND ITS EFFECT ON THE SUBSEQUENT YIELD OF BARLEY”
e1“In 2 of the 3 years, barley yields, averaged across tillage treatments, were greater in the plots where the sprayer had been used to apply the glyphosate treatments than in the plots where the rope wick applicator had been used”
Claim · model-written summary
Barley yields decreased as quackgrass culm density increased.
- Taxon
- barleyHordeum vulgaree1
- Interactor
- quackgrasse1weed
- Outcome
- Barley yieldse1
- Direction
- decreasede1
- Qualifier
- other factors seemed to have influenced the yields in one of the yearse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“CONTROL OF QUACKGRASS IN FALLOW FROM SEVERAL GLYPHOSATE PLUS TILLAGE TREATMENTS AND ITS EFFECT ON THE SUBSEQUENT YIELD OF BARLEY”
e1“Barley yields decreased as the quackgrass culm density increased, although other factors seemed to have influenced the yields in one of the years”
The same questions in other papers
glyphosate · yield · Hordeum vulgare (barley)Results differ
2 papers in the same direction as this paper · 2 in the opposite direction
- no effect
- negative
- positive
1 paper more in this group
See all 5 papers →herbicide · yield · Hordeum vulgare (barley)Results differ
41 papers in the same direction as this paper · 19 in the opposite direction
- no effect
- no effect
- no effect
57 papers more in this group
See all 61 papers →application · yield · Hordeum vulgare (barley)Positive and negative results
89 papers in the same direction as this paper · 13 in the opposite direction
- negative
- no effect
- no effect
99 papers more in this group
See all 103 papers →tillage · yield · Hordeum vulgare (barley)Positive and negative results
104 papers in the same direction as this paper · 43 in the opposite direction · 13 reporting no difference from an alternative
- no effect
- no effect
- negative
157 papers more in this group
See all 161 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.