Abstract
Weed interference with the growth and yield of corn plants is affected by both mechanical and chemical means of weed control. Recently, corn hybrids accumulating more leaf area, maturing earlier, yielding better in narrower row spacings and tolerating higher plant populations better than conventional hybrids have been developed. Because of more rapid leaf area accumulation during the earliest stages of canopy development and overall canopy architecture, they may be more susceptible to damage due to mechanical weed control. The objective of this study was to assess the response of corn hybrids with a wide range of canopy architectures to chemical and mechanical (rotary hoeing) weed control, with an emphasis on quantifying morphology and grain yield responses. Field experiments were conducted in 1997 and 1998 at Ste. Anne de Bellevue, Quebec. Three hybrids were tested: leafy reduced‐stature (LRS1 and LRS2), and the conventional hybrid Pioneer 3979 (P3979). Rotary hoeing alone had very little effect, while herbicide application reduced the interference of weeds with growth and grain yield of all hybrids. Hybrid P3979 had more total leaf area than LRS1 and LRS2, but the percentage of leaf area above the ear was much higher for LRS hybrids (70 %) than for P3979 (51 %). Generally, LRS hybrids were much shorter with more leaf area above the ear than P3979, contributing to the large differences in canopy architecture between the LRS hybrids and P3979. However, morphology and grain yield response of hybrids to rotary hoeing and herbicide weed control was not different, indicating that the new hybrids were not more susceptible to damage caused by mechanical weed control than a corn hybrid with a conventional canopy architecture.
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Claims 10
Claim · model-written summary
Rotary hoeing alone had very little effect.
- Taxon
- corn
Zea mays subsp. mayst0 - Treatment
- Rotary hoeinge0
- Outcome
- very little effecte0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rotary hoeing alone had very little effect”
t0“Corn Hybrids”
Claim · model-written summary
Herbicide reduced weed interference with growth.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- herbicide applicatione0
- Interactor
- weedse0weed
- Outcome
- interference of weeds with growthe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“herbicide application reduced the interference of weeds with growth and grain yield of all hybrids”
t0“Corn Hybrids”
Claim · model-written summary
Herbicide reduced weed interference with grain yield.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- herbicide applicatione0
- Interactor
- weedse0weed
- Outcome
- grain yielde0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“herbicide application reduced the interference of weeds with growth and grain yield of all hybrids”
t0“Corn Hybrids”
Claim · model-written summary
P3979 had more total leaf area than LRS1.
- Taxon
- cornZea mays subsp. mayst0
- Material
- P3979e0
- Outcome
- total leaf areae0
- Direction
- moree0
- Comparator
- LRS1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Hybrid P3979 had more total leaf area than LRS1 and LRS2”
t0“Corn Hybrids”
Claim · model-written summary
P3979 had more total leaf area than LRS2.
- Taxon
- cornZea mays subsp. mayst0
- Material
- P3979e0
- Outcome
- total leaf areae0
- Direction
- moree0
- Comparator
- LRS2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Hybrid P3979 had more total leaf area than LRS1 and LRS2”
t0“Corn Hybrids”
Claim · model-written summary
LRS hybrids had 70% of leaf area above the ear versus 51% in P3979.
- Taxon
- cornZea mays subsp. mayst0
- Material
- LRS hybridse0
- Outcome
- percentage of leaf area above the eare0
- Direction
- much highere0
- Value
- 70 %e0
- Qualifier
- 51 %e0
- Comparator
- P3979e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the percentage of leaf area above the ear was much higher for LRS hybrids (70 %) than for P3979 (51 %)”
t0“Corn Hybrids”
Claim · model-written summary
LRS hybrids were generally much shorter than P3979.
- Taxon
- cornZea mays subsp. mayst0
- Material
- LRS hybridse0
- Outcome
- shortere0
- Direction
- shortere0
- Comparator
- P3979e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Generally, LRS hybrids were much shorter with more leaf area above the ear than P3979”
t0“Corn Hybrids”
Claim · model-written summary
Hybrids did not differ in morphology response to weed control.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- rotary hoeing and herbicide weed controle0
- Outcome
- morphologye0
- Direction
- not differente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“morphology and grain yield response of hybrids to rotary hoeing and herbicide weed control was not different”
t0“Corn Hybrids”
Claim · model-written summary
Hybrids did not differ in grain yield response to weed control.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- rotary hoeing and herbicide weed controle0
- Outcome
- grain yielde0
- Direction
- not differente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“morphology and grain yield response of hybrids to rotary hoeing and herbicide weed control was not different”
t0“Corn Hybrids”
Claim · model-written summary
The new hybrids were not more susceptible to rotary hoe damage than conventional architecture.
- Taxon
- cornZea mays subsp. mayst0
- Material
- new hybridse0
- Outcome
- damage caused by mechanical weed controle0
- Direction
- not more susceptiblee0
- Comparator
- a corn hybrid with a conventional canopy architecturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“new hybrids were not more susceptible to damage caused by mechanical weed control than a corn hybrid with a conventional canopy architecture”
t0“Corn Hybrids”
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