Abstract
The effect of Russian thistle density and duration of interference on spring wheat was investigated in two 3-yr field studies. In the density study, the best fit regression equation predicted a loss in spring wheat yield of 0.5, 0.5, and 0.6% in 1983, 1984, and 1985, respectively, for each percent of the total biomass contributed by Russian thistle. In 1985, when rainfall was 46% below normal, the highest weed density produced greater than 70% of the total plant biomass and reduced yields more than 50%. In contrast, in 1984 when rainfall was 65% above normal, the highest weed density produced less than 20% of the total plant biomass and reduced yields 11%. In the duration study, the predicted yield loss was 2.3 and 0.7% for 1983 and 1984, respectively, for each week of interference. In 1985, yield was not significantly reduced until after 6 weeks of interference. In both studies, spikes/m of row had the highest correlation with yield and were affected the most by weed interference.
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Claims 11
Claim · model-written summary
For each percent biomass from thistle, predicted wheat yield loss was 0.5% in 1983.
- Taxon
- spring wheat
Triticum aestivumt0 - Interactor
- Russian thistle
Salsola traguse0weed - Outcome
- spring wheat yielde0
- Direction
- losse0
- Value
- 0.5e0
- Qualifier
- 1983e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“predicted a loss in spring wheat yield of 0.5, 0.5, and 0.6% in 1983, 1984, and 1985, respectively, for each percent of the total biomass contributed by Russian thistle”
t0“Spring Wheat (Triticum aestivum)”
Claim · model-written summary
For each percent biomass from thistle, predicted wheat yield loss was 0.5% in 1984.
- Taxon
- spring wheatTriticum aestivumt0
- Interactor
- Russian thistleSalsola traguse0weed
- Outcome
- spring wheat yielde0
- Direction
- losse0
- Value
- 0.5e0
- Qualifier
- 1984e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“predicted a loss in spring wheat yield of 0.5, 0.5, and 0.6% in 1983, 1984, and 1985, respectively, for each percent of the total biomass contributed by Russian thistle”
t0“Spring Wheat (Triticum aestivum)”
Claim · model-written summary
For each percent biomass from thistle, predicted wheat yield loss was 0.6% in 1985.
- Taxon
- spring wheatTriticum aestivumt0
- Interactor
- Russian thistleSalsola traguse0weed
- Outcome
- spring wheat yielde0
- Direction
- losse0
- Value
- 0.6%e0
- Qualifier
- 1985e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“predicted a loss in spring wheat yield of 0.5, 0.5, and 0.6% in 1983, 1984, and 1985, respectively, for each percent of the total biomass contributed by Russian thistle”
t0“Spring Wheat (Triticum aestivum)”
Claim · model-written summary
At highest thistle density in dry 1985, thistle exceeded 70% of biomass.
- Taxon
- spring wheatTriticum aestivumt0
- Outcome
- total plant biomasse0
- Value
- greater than 70%e0
- Qualifier
- rainfall was 46% below normale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 1985, when rainfall was 46% below normal, the highest weed density produced greater than 70% of the total plant biomass”
t0“Spring Wheat (Triticum aestivum)”
Claim · model-written summary
At highest thistle density in dry 1985, wheat yield fell more than 50%.
- Taxon
- spring wheatTriticum aestivumt0
- Treatment
- highest weed densitye0
- Outcome
- yieldse0
- Direction
- reducede0
- Value
- more than 50%e0
- Qualifier
- rainfall was 46% below normale0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 1985, when rainfall was 46% below normal, the highest weed density produced greater than 70% of the total plant biomass and reduced yields more than 50%.”
t0“Spring Wheat (Triticum aestivum)”
Claim · model-written summary
At highest thistle density in wet 1984, thistle contributed under 20% of biomass.
- Taxon
- spring wheatTriticum aestivumt0
- Outcome
- total plant biomasse0
- Value
- less than 20%e0
- Qualifier
- rainfall was 65% above normale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in 1984 when rainfall was 65% above normal, the highest weed density produced less than 20% of the total plant biomass”
t0“Spring Wheat (Triticum aestivum)”
Claim · model-written summary
At highest thistle density in wet 1984, wheat yield fell 11%.
- Taxon
- spring wheatTriticum aestivumt0
- Treatment
- highest weed densitye0
- Outcome
- yieldse0
- Direction
- reducede0
- Value
- 11%e0
- Qualifier
- rainfall was 65% above normale0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in 1984 when rainfall was 65% above normal, the highest weed density produced less than 20% of the total plant biomass and reduced yields 11%.”
t0“Spring Wheat (Triticum aestivum)”
Claim · model-written summary
Each week of interference predicted 2.3% yield loss in 1983.
- Taxon
- spring wheatTriticum aestivumt0
- Interactor
- Russian thistleSalsola traguse1weede0
- Outcome
- yield losse0
- Direction
- losse0
- Value
- 2.3e0
- Qualifier
- 1983e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“predicted yield loss was 2.3 and 0.7% for 1983 and 1984, respectively, for each week of interference”
t0“Spring Wheat (Triticum aestivum)”
e1“Russian thistle density and duration of interference on spring wheat”
Claim · model-written summary
Each week of interference predicted 0.7% yield loss in 1984.
- Taxon
- spring wheatTriticum aestivumt0
- Interactor
- Russian thistleSalsola traguse1weede0
- Outcome
- yield losse0
- Direction
- losse0
- Value
- 0.7%e0
- Qualifier
- 1984e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“predicted yield loss was 2.3 and 0.7% for 1983 and 1984, respectively, for each week of interference”
t0“Spring Wheat (Triticum aestivum)”
e1“Russian thistle density and duration of interference on spring wheat”
Claim · model-written summary
In 1985, yield was not significantly reduced until after six weeks of interference.
- Taxon
- spring wheatTriticum aestivumt0
- Outcome
- yielde0
- Direction
- reducede0
- Value
- 6 weekse0
Not reportedTreatmentQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 1985, yield was not significantly reduced until after 6 weeks of interference.”
t0“Spring Wheat (Triticum aestivum)”
Claim · model-written summary
Spikes per metre had the strongest yield correlation and were most affected by weed interference.
- Taxon
- spring wheatTriticum aestivumt0
- Outcome
- spikes/m of rowe0
- Direction
- higheste0
Not reportedTreatmentQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“spikes/m of row had the highest correlation with yield and were affected the most by weed interference.”
t0“Spring Wheat (Triticum aestivum)”
The same questions in other papers
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