Claim · model-written summary
Portulaca did not show exceptionally large seed production or seed banks in the uncropped treatment, apparently through competition with the two larger species.
- Treatment
- uncropped treatment which did not receive herbicidese7
- Interactor
- Amaranthus and Chenopodium
Chenopodium_with_green_foliage%2C_photographed_in_Tamil_Nadu%2C_India.jpg?width=60)
Amaranthuse7weed - Outcome
- seed production and seed bankse7
- Qualifier
- apparently suffered from competition with the two larger speciese7
PortulacaNot reportedMaterialGeneCompoundOrgan / stageSecond interactorSecond interactor roleComparatorSettingDirectionValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_with_green_foliage%2C_photographed_in_Tamil_Nadu%2C_India.jpg?width=500)
Verbatim
e7“An uncropped treatment which did not receive herbicides had exceptionally large seed production and seed banks of Amaranthus and Chenopodium, but not Portulaca and Digitaria, which apparently suffered from competition with the two larger species”
Title
Effects of Tillage and Mulch on Weed Seed Production and Seed Banks in Sweet Corn
Charles L. Mohler; M. Brett Callaway Journal of Applied Ecology 1995. doi:10.2307/2404658
Other claims from this paper (18)
- Intervention effect Amaranthus seed production was significantly greater in no-till than in till treatments.
- Intervention effect Digitaria seed production was significantly greater in no-till than in till treatments.
- Intervention effect Amaranthus seed production was significantly greater in the absence of a corn crop.
- Intervention effect Chenopodium seed production was significantly greater in the absence of a corn crop.
- Intervention effect Portulaca seed production was significantly greater in the absence of a corn crop.
- Intervention effect Secale cereale mulch decreased Portulaca seed production in one year.
- Intervention effect Digitaria seed banks were greater in no-till than in till treatments.
- Intervention effect Seed banks of winter annual forbs were greater in till treatments.
- Intervention effect Presence of a corn crop did not affect weed seed banks until the final year of the study.
- Intervention effect In the final year, Amaranthus seed banks were greater in the absence of a crop.
- Intervention effect In the final year, Chenopodium seed banks were greater in the absence of a crop.
- Intervention effect In the final year, Portulaca seed banks were greater in the absence of a crop.
- Intervention effect Amaranthus had exceptionally large seed production and seed banks in the uncropped treatment without herbicides.
- Intervention effect Chenopodium had exceptionally large seed production and seed banks in the uncropped treatment without herbicides.
- Intervention effect Digitaria did not show exceptionally large seed production or seed banks in the uncropped treatment, apparently through competition with the two larger species.
- Observation Most weed seeds were produced by the first cohort of plants to emerge.
- Mechanism Differences among treatments in seed number per unit area were primarily due to effects on individual plant size and seed production.
- Observation Effects on weed seedling density and rate of survival to maturity were of secondary importance.