Claim · model-written summary
In 1969, at least six weed-free weeks gave maximum cotton yield.
- Taxon
- Cotton
Gossypium hirsutume0 - Treatment
- free of annual grass and broadleaf weeds for 6 or more weekse0
- Interactor
- annual grass and broadleaf weedse0weed
- Outcome
- yieldse0
- Direction
- maximume0
- Value
- 6 or more weekse0
Not reportedMaterialGeneCompoundOrgan / stageSecond interactorSecond interactor roleComparatorSettingQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cotton maintained free of annual grass and broadleaf weeds for 6 or more weeks after emergence in 1969 produced maximum yields”
Title
Influence of Nitrogen on Weed Competition in Cotton
Gale A. Buchanan; Robert D. McLaughlin Weed Science 1975. doi:10.1017/s004317450005311x
Other claims from this paper (9)
- Observation In 1970 and 1971, at least eight weed-free weeks were required for maximum yield.
- Intervention effect Nitrogen at 67 or 100 kg/ha did not alter the cotton weed-free requirement.
- Intervention effect Cotton yield did not fall with two or four weeks of weed competition in 1969.
- Intervention effect Up to seven weeks of weed competition did not reduce cotton yield in 1970 or 1971.
- Intervention effect Nitrogen did not change cotton-weed competition in 1969 and 1971.
- Observation In 1970, cotton tolerated six weeks of weed competition without nitrogen.
- Observation In 1970, cotton tolerated seven weeks of weed competition at 67 and 100 kg/ha nitrogen.
- Method / resource Height and stem diameter were less reliable indicators of cotton-weed relations than yield.
- Intervention effect Cotton height and stem diameter showed no consistent difference among nitrogen rates.