Abstract
Field experiments were conducted in 1996, 1997, and 1998 at Ste. Anne de Bellevue, Quebec, Canada, and in 1996 at Ottawa, Ontario, Canada, to quantify the impact of corn hybrids, differing in canopy architecture and plant spacing (plant population density and row spacing), on biomass production by transplanted and naturally occurring weeds. The treatments consisted of a factorial combination of corn type (leafy reduced stature [LRS], late-maturing big leaf [LMBL], a conventional Pioneer 3979 [P3979], and, as a control, a corn-free condition [weed monoculture]), two weed levels (low density [transplanted weeds: common lambsquarters and redroot pigweed] and high density [weedy: plots with naturally occurring weeds]), two corn population densities (normal and high), and row spacings (38 and 76 cm). At all site-years under both weed levels, the decrease in biomass production by both transplanted and naturally occurring weeds was greater due to the narrow row spacing than due to the high plant population density. The combination of narrower rows and higher population densities increased corn canopy light interception by 3 to 5%. Biomass produced by both transplanted and naturally occurring weeds was five to eight times less under the corn canopy than in the weed monoculture treatment. Generally, weed biomass production was reduced more by early-maturing hybrids (LRS and P3979) than by LMBL. Thus, hybrid selection and plant spacing could be used as important components of integrated pest management (weed control) for sustainable agriculture.Nomenclature: Common lambsquarters, Chenopodium album L. #3 CHEAL; corn, Zea mays L.; redroot pigweed, Amaranthus retroflexus L. # AMARE.Additional index words: Competitivness, early maturity, weed management.Abbreviations: LAI, leaf area index; Lfy, leafy; LMBL, late-maturing big leaf; LRS, Leafy reduced stature; P3979, Pioneer 3979; rd1, reduced stature.
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Claims 5
Claim · model-written summary
Narrow corn rows suppressed weed biomass more than high plant density.
- Taxon
- Corn
Zea mays subsp. mayst0 - Treatment
- narrow row spacinge0
- Outcome
- biomass production by both transplanted and naturally occurring weedse0
- Direction
- decreasee0
- Comparator
- high plant population densitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn (Zea mays)”
e0“the decrease in biomass production by both transplanted and naturally occurring weeds was greater due to the narrow row spacing than due to the high plant population density.”
Claim · model-written summary
Narrow rows plus high density increased corn canopy light interception by 3 to 5%.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- combination of narrower rows and higher population densitiese0
- Outcome
- corn canopy light interceptione0
- Direction
- increasede0
- Value
- 3 to 5%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn (Zea mays)”
e0“The combination of narrower rows and higher population densities increased corn canopy light interception by 3 to 5%.”
Claim · model-written summary
Weed biomass under corn canopy was five to eight times lower than in weed monoculture.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- corn canopye0
- Outcome
- Biomass produced by both transplanted and naturally occurring weedse0
- Direction
- lesse0
- Value
- five to eight timese0
- Comparator
- weed monoculture treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn (Zea mays)”
e0“Biomass produced by both transplanted and naturally occurring weeds was five to eight times less under the corn canopy than in the weed monoculture treatment.”
Claim · model-written summary
Early-maturing LRS and P3979 generally reduced weed biomass more than LMBL.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- early-maturing hybrids (LRS and P3979)e0
- Outcome
- weed biomass productione0
- Direction
- reduced moree0
- Comparator
- LMBLe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn (Zea mays)”
e0“weed biomass production was reduced more by early-maturing hybrids (LRS and P3979) than by LMBL.”
Claim · model-written summary
The authors suggest hybrid selection and plant spacing for integrated weed control.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- integrated pest management (weed control)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn (Zea mays)”
e0“hybrid selection and plant spacing could be used as important components of integrated pest management (weed control) for sustainable agriculture.”
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Zea mays subsp. mays · weed · Zea mays (maize)Positive and negative results
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See all 34 papers →density · weed · Zea mays (maize)Positive and negative results
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See all 33 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.