Claim · model-written summary
The percent reduction in corn yield fit a hyperbolic function over velvetleaf densities from 1 to 30 plants m 2.
- Taxon
- corn
Zea mays subsp. mayse0 - Interactor
- velvetleaf
Abutilon theophrastie0weed - Outcome
- percent reduction in corn yielde0
- Qualifier
- hyperbolic functione0
Not reportedMaterialGeneCompoundOrgan / stageSecond interactorSecond interactor roleTreatmentComparatorSettingDirectionValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The percent reduction in corn yield fit a hyperbolic function over velvetleaf densities from 1 to 30 plants m 2”
Title
John Cardina; Emilie Regnier; Denise Sparrow Weed Science 1995. doi:10.1017/s0043174500080863
Other claims from this paper (10)
- Association Percent corn yield loss was higher in a warm, wet year (1990) than in a dry year (1991) or a cold, wet year (1992).
- Association Velvetleaf seed production was higher in a warm, wet year (1990) than in a dry year (1991) or a cold, wet year (1992).
- Intervention effect The percent corn yield reduction was generally greater in no-tillage than in conventional tillage.
- Association The percent corn yield reduction was generally greater from early than from late emerging velvetleaf.
- Observation Maximum velvetleaf seed production ranged from about 18,000 seeds m 2 (early emerging weeds, no-tillage, 1990) to 100 seeds m 2 (late emerging weeds, no-tillage, 1992).
- Observation The single year economic threshold for early emerging velvetleaf ranged from 0.40 to 14.0 velvetleaf m 2 in conventional tillage.
- Observation The single year economic threshold for early emerging velvetleaf ranged from 0.13 to 3.13 in no-tillage.
- Method / resource Economic thresholds predicted from yield goal information deviated from actual thresholds (using actual yields) for a given year by -43 to 30%.
- Association Single year economic thresholds were similar in both tillage treatments.
- Recommendation The value of single year economic thresholds for management decisions is questionable due to variation among growing seasons and weed seed production from subthreshold populations.