Abstract
A 3-yr study was conducted to establish if the presence of corn had an effect on the emergence patterns and total weed seedling density under growing conditions in southwestern Québec. Weed seedling emergence was monitored in permanent quadrats throughout the growing season in the presence and absence of growing corn. Common lambsquarters and barnyardgrass were prevalent in most site-years. The presence of corn did not affect the patterns of common lambsquarters and barnyardgrass emergence nor their total weed seedling density except in 1994. Corn canopy was probably not sufficiently developed to affect light levels or soil temperature needed for weed germination and, consequently, seedling emergence. In 1994, in the absence of corn, some soil crusting was observed on a fine-textured soil, and the total number of seedlings was reduced. The results of these weed emergence studies in corn can be extended to other crops growing with wide row spacing and relatively slow canopy closure similar to those of grain corn.Nomenclature: Barnyardgrass, Echinochloa crus-galli (L.) Beauv. #3 ECHCG; common lambsquarters, Chenopodium album L. # CHEAL; corn, Zea mays L. ‘Pioneer 3921’.Additional index words: Amaranthus retroflexus L., AMARE, crop competition, redroot pigweed, weed density, weed seedling emergence.Abbreviations: CHU, corn heat units; PAR, photosynthetically active radiation.
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Claims 6
Claim · model-written summary
Corn presence did not alter common lambsquarters emergence patterns except in 1994.
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- presence of corne0
- Interactor
- common lambsquarters
Chenopodium albume0weed - Outcome
- patterns of common lambsquarterse0
- Direction
- did not affecte0
- Qualifier
- except in 1994e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The presence of corn did not affect the patterns of common lambsquarters and barnyardgrass emergence nor their total weed seedling density except in 1994”
t0“corn”
Claim · model-written summary
Corn presence did not alter barnyardgrass emergence patterns except in 1994.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- presence of corne0
- Interactor
- barnyardgrass
Echinochloa crus-gallie0weed - Outcome
- barnyardgrass emergencee0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The presence of corn did not affect the patterns of common lambsquarters and barnyardgrass emergence nor their total weed seedling density except in 1994”
Claim · model-written summary
Corn presence did not affect total weed seedling density except in 1994.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- presence of corne0
- Outcome
- total weed seedling densitye0
- Direction
- did not affecte0
- Qualifier
- except in 1994e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The presence of corn did not affect the patterns of common lambsquarters and barnyardgrass emergence nor their total weed seedling density except in 1994”
Claim · model-written summary
In 1994, seedling numbers were lower without corn where soil crusted.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- total number of seedlingse0
- Direction
- reducede0
- Qualifier
- soil crustinge0
- Comparator
- absence of corne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 1994, in the absence of corn, some soil crusting was observed on a fine-textured soil, and the total number of seedlings was reduced”
Claim · model-written summary
The authors infer that the corn canopy may have been insufficient to alter light or soil temperature for weed emergence.
- Taxon
- CornZea mays subsp. mayse0
- Outcome
- seedling emergencee0
- Qualifier
- not sufficiently developed to affect light levels or soil temperaturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Corn canopy was probably not sufficiently developed to affect light levels or soil temperature needed for weed germination and, consequently, seedling emergence”
Claim · model-written summary
The authors suggest extending these emergence findings to crops with wide row spacing and slow canopy closure.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- can be extended to other cropse0
- Qualifier
- wide row spacing and relatively slow canopy closuree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results of these weed emergence studies in corn can be extended to other crops growing with wide row spacing and relatively slow canopy closure similar to those of grain corn”
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See all 34 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.