Abstract
Summary The influence of weather on the efficacy of dichlorprop‐P/MCPA and tribenuron‐methyl on annual weeds in spritig barley was studied in the field during 4 years at six locations in southern Sweden. The herbicides were applied at one‐eighth to three‐quarters of the full dose at three application times with approximately 6‐day intervals. Weather stations, placed in the experiments, recorded climatic data, Maximum herbicide efficacy was obtained when spraying 1 week after the cotyledon stage with half or three‐quarters of the recommended dose. Dose‐response curves were estimated and the ED 80 doses were calculated. On average, the herbicide dose required to obtain an effect of 80% was about 40% of the recommended dose. The influence of weather was analysed for seven different periods: 7 and 2 days before and after herbicide application, 1 day before and after application, and the day of herbicide treatment. The most pronounced eftects of weather were found for the day of and the day before herbicide application, revealing the strong influence of weather on herbicide uptake and plant metabolism. High air tetnperature and low global radiation during the day of treattnent reduced the ED 80 dose of dichlorprop‐P/MCPA, whereas the ED 80 dose of tribenuron‐methyl increased. For both herbicides, precipitation and high soil temperature increased the ED 80 dose, which reflects the importance of rain on herbicide uptake and the effect of soil temperature on plant growth. The R 2 values were higher in the analyses of dichlorprop‐P/MCPA than of tribenuron‐methyl, indicating that the effect of dichlorprop‐P/MCA was more weather‐dependent than that of tribenuron‐methyl. Separate analyses of the ED 80 doses for Brassica napus L., Chenopodium, album L. and Stellaria media (L.) Vill. generally resulted in increased R 2 values. but otherwise gave results similar to those for the total weed population. Although the analyses revealed significant effects of indivtdual weather factors on herbicide efficacy, it was not possible to discern a consistent and causal relationship between weather and herbicide performance.
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 10
Claim · model-written summary
Maximum weed control occurred with spraying one week after the cotyledon stage at half or three-quarter dose.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaree1 - Treatment
- spraying 1 week after the cotyledon stage with half or three‐quarters of the recommended dosee0
- Outcome
- herbicide efficacye0
- Direction
- Maximume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Maximum herbicide efficacy was obtained when spraying 1 week after the cotyledon stage with half or three‐quarters of the recommended dose”
e1“annual weeds in spritig barley was studied in the field”
Claim · model-written summary
The ED80 dose averaged about 40% of the recommended dose.
- Taxon
- barleyHordeum vulgaree1
- Outcome
- herbicide dose required to obtain an effect of 80%e0
- Value
- about 40% of the recommended dosee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“On average, the herbicide dose required to obtain an effect of 80% was about 40% of the recommended dose”
e1“annual weeds in spritig barley was studied in the field”
Claim · model-written summary
Weather effects were strongest on application day and the preceding day.
- Taxon
- barleyHordeum vulgaree1
- Outcome
- eftects of weathere0
- Direction
- most pronouncede0
- Setting
- day of and the day before herbicide applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The most pronounced eftects of weather were found for the day of and the day before herbicide application”
e1“annual weeds in spritig barley was studied in the field”
Claim · model-written summary
High air temperature and low radiation reduced the ED80 dose of dichlorprop‐P/MCPA.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- dichlorprop‐P/MCPAe0
- Outcome
- ED 80 dosee0
- Direction
- reducede0
- Qualifier
- High air tetnperature and low global radiatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High air tetnperature and low global radiation during the day of treattnent reduced the ED 80 dose of dichlorprop‐P/MCPA”
e1“annual weeds in spritig barley was studied in the field”
Claim · model-written summary
High temperature and low radiation increased the ED80 dose of tribenuron‐methyl.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- tribenuron‐methyle0
- Outcome
- ED 80 dosee0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“whereas the ED 80 dose of tribenuron‐methyl increased”
e1“annual weeds in spritig barley was studied in the field”
Claim · model-written summary
Precipitation and high soil temperature increased the ED80 dose for both herbicides.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- both herbicidese0
- Outcome
- ED 80 dosee0
- Direction
- increasede0
- Qualifier
- precipitation and high soil temperaturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For both herbicides, precipitation and high soil temperature increased the ED 80 dose”
e1“annual weeds in spritig barley was studied in the field”
Claim · model-written summary
Weather models had higher R2 for dichlorprop‐P/MCPA than tribenuron‐methyl.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- dichlorprop‐P/MCPAe0
- Outcome
- R 2 valuese0
- Direction
- highere0
- Comparator
- tribenuron‐methyle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The R 2 values were higher in the analyses of dichlorprop‐P/MCPA than of tribenuron‐methyl”
e1“annual weeds in spritig barley was studied in the field”
Claim · model-written summary
Species-specific ED80 analyses generally increased R2 values.
- Taxon
- barleyHordeum vulgaree1
- Outcome
- R 2 valuese0
- Qualifier
- Brassica napus L., Chenopodium, album L. and Stellaria media (L.) Vill.e0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Separate analyses of the ED 80 doses for Brassica napus L., Chenopodium, album L. and Stellaria media (L.) Vill. generally resulted in increased R 2 values”
e1“annual weeds in spritig barley was studied in the field”
Claim · model-written summary
Species-specific analyses otherwise agreed with the total-weed analysis.
- Taxon
- barleyHordeum vulgaree1
- Outcome
- results similar to those for the total weed populatione0
- Comparator
- total weed populatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but otherwise gave results similar to those for the total weed population”
e1“annual weeds in spritig barley was studied in the field”
Claim · model-written summary
No consistent causal weather–efficacy relationship could be discerned.
- Taxon
- barleyHordeum vulgaree1
- Outcome
- consistent and causal relationship between weather and herbicide performancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it was not possible to discern a consistent and causal relationship between weather and herbicide performance”
e1“annual weeds in spritig barley was studied in the field”
The same questions in other papers
application · control · Hordeum vulgare (barley)Positive and negative results
8 papers in the same direction as this paper · 3 in the opposite direction
- negative
- no effect
- no effect
8 papers more in this group
See all 12 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.