Abstract
Common sunflower ( Helianthus annuus L.) interference in onions ( Allium cepa L. ‘Yellow Granex PRR’) was studied at different weed densities and periods of interference. Onion yields were reduced when the highest density (360/m 2 ) of common sunflower interference with onions from 6 weeks after emergence and when sunflower at densities of 50/m 2 and 5/m 2 interfered for 12 and 15 weeks after emergence, respectively. Yield was not reduced if the crop was kept weed-free for 2 to 12 weeks after emergence with the shortest weed-free periods of 2 and 6 weeks requiring high light irradiance and high soil temperature and intermediate soil moisture. Climatic factors were more useful than weed density in explaining differential interference of sunflower in onions. Onion yield was negatively linearly correlated (P<0.05) with sunflower fresh weight, but was not linearly correlated with sunflower height.
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Claims 7
Claim · model-written summary
Onion yield fell with sunflower density of 360/m 2 from six weeks after emergence.
- Taxon
- onions
Allium cepae0 - Treatment
- highest density (360/m 2 ) of common sunflower interferencee0
- Interactor
- common sunflower
Helianthus annuuse0weed - Outcome
- Onion yieldse0
- Direction
- reducede0
- Value
- 360/m 2e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Onion yields were reduced when the highest density (360/m 2 ) of common sunflower interference with onions from 6 weeks after emergence”
Claim · model-written summary
Onion yield fell when sunflower density of 50/m 2 persisted for 12 weeks.
- Taxon
- onionsAllium cepae1
- Treatment
- sunflower at densities of 50/m 2e0
- Interactor
- sunflowerHelianthus annuuse0weed
- Outcome
- Onion yieldse1
- Direction
- reducede1
- Value
- 50/m 2e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sunflower at densities of 50/m 2 and 5/m 2 interfered for 12 and 15 weeks after emergence, respectively.”
e1“Onion yields were reduced when the highest density (360/m 2 ) of common sunflower interference with onions from 6 weeks after emergence”
Claim · model-written summary
Onion yield fell when sunflower density of 5/m 2 persisted for 15 weeks.
- Taxon
- onionsAllium cepae1
- Treatment
- sunflower at densities of 50/m 2 and 5/m 2e0
- Interactor
- sunflowerHelianthus annuuse0weed
- Outcome
- Onion yieldse1
- Direction
- reducede1
- Value
- 5/m 2e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sunflower at densities of 50/m 2 and 5/m 2 interfered for 12 and 15 weeks after emergence, respectively.”
e1“Onion yields were reduced when the highest density (360/m 2 ) of common sunflower interference with onions from 6 weeks after emergence”
Claim · model-written summary
Onion yield was not reduced after two to twelve weeks of weed free maintenance.
- Taxon
- OnionsAllium cepat0
- Treatment
- kept weed-free for 2 to 12 weekse0
- Outcome
- Yielde0
- Direction
- not reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield was not reduced if the crop was kept weed-free for 2 to 12 weeks after emergence”
t0“Onions”
Claim · model-written summary
Climate factors explained differential sunflower interference in onions better than weed density.
- Taxon
- onionsAllium cepae0
- Interactor
- sunflowerHelianthus annuuse0weed
- Outcome
- differential interference of sunflowere0
- Direction
- more usefule0
- Comparator
- weed densitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Climatic factors were more useful than weed density in explaining differential interference of sunflower in onions.”
Claim · model-written summary
Onion yield was significantly negatively correlated with sunflower fresh weight.
- Taxon
- OnionAllium cepae0
- Interactor
- sunflowerHelianthus annuuse0weed
- Outcome
- Onion yielde0
- Direction
- negativelye0
- Qualifier
- sunflower fresh weighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Onion yield was negatively linearly correlated (P<0.05) with sunflower fresh weight”
Claim · model-written summary
Onion yield was not linearly correlated with sunflower height.
- Taxon
- OnionAllium cepae1
- Interactor
- sunflowerHelianthus annuuse0weed
- Outcome
- Onion yielde1
- Direction
- not linearly correlatede0
- Qualifier
- sunflower heighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but was not linearly correlated with sunflower height.”
e1“Onion yield was negatively linearly correlated (P<0.05) with sunflower fresh weight”
The same questions in other papers
Helianthus annuus · yield · Allium cepa (onion)Results agree
1 paper in the same direction as this paper
- negative
herbicide · yield · Allium cepa (onion)Results differ
12 papers in the same direction as this paper · 75 in the opposite direction
- positive
- positive
- positive
84 papers more in this group
See all 88 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.