Abstract
Studies were conducted at the Main Agricultural Experiment Station in Fayetteville and the Vegetable Substation in Kibler, Arkansas, in 1992 and 1993 on the same plots to evaluate weed suppression by winter cover crops alone or in combination with reduced herbicide rates in no-till sweet corn and to evaluate cover crop effects on growth and yield of sweet corn. Plots seeded to rye plus hairy vetch, rye, or wheat had at least 50% fewer early season weeds than hairy vetch alone or no cover crop. None of the cover crops reduced population of yellow nutsedge. Without herbicides, hairy vetch did not suppress weeds 8 wk after cover crop desiccation. Half rates of atrazine and metolachlor (1.1 + 1.1 kg ai ha −1 ) reduced total weed density more effectively in no cover crop than in hairy vetch. Half rates of atrazine and metolachlor controlled redroot pigweed, Palmer amaranth, and goosegrass regardless of cover crop. Full rates of atrazine and metolachlor (2.2 + 2.2 kg ai ha −1 ) were needed to control large crabgrass in hairy vetch. Control of yellow nutsedge in hairy vetch was marginal even with full herbicide rates. Yellow nutsedge population increased and control with herbicides declined the second year, particularly with half rates of atrazine and metolachlor. All cover crops except hairy vetch alone reduced emergence, height, and yield of sweet corn. Sweet corn yields from half rates of atrazine and metolachlor equalled the full rates regardless of cover crops.
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Claims 13
Claim · model-written summary
Rye plus hairy vetch, rye, and wheat each had at least 50% fewer early season weeds than hairy vetch alone or no cover crop.
Verbatim
e0“Plots seeded to rye plus hairy vetch, rye, or wheat had at least 50% fewer early season weeds than hairy vetch alone or no cover crop”
t0“Sweet Corn”
Claim · model-written summary
None of the cover crops reduced yellow nutsedge population.
- Taxon
- Sweet Cornt0
- Treatment
- cover cropse0
- Interactor
- yellow nutsedgee0weed
- Outcome
- population of yellow nutsedgee0
- Direction
- None of the cover crops reducede0
Not reportedComparator
Verbatim
e0“None of the cover crops reduced population of yellow nutsedge”
t0“Sweet Corn”
Claim · model-written summary
Without herbicides, hairy vetch did not suppress weeds eight weeks after desiccation.
- Taxon
- Sweet Cornt0
- Treatment
- hairy vetche0
- Interactor
- weedse0weed
- Outcome
- weedse0
- Direction
- did not suppresse0
- Qualifier
- Without herbicidese0
Not reportedComparator
Verbatim
e0“Without herbicides, hairy vetch did not suppress weeds 8 wk after cover crop desiccation”
t0“Sweet Corn”
Claim · model-written summary
Half rates of atrazine and metolachlor reduced total weed density more effectively with no cover crop than with hairy vetch.
Verbatim
e0“Half rates of atrazine and metolachlor (1.1 + 1.1 kg ai ha −1 ) reduced total weed density more effectively in no cover crop than in hairy vetch”
t0“Sweet Corn”
Claim · model-written summary
Half rates of atrazine and metolachlor controlled redroot pigweed regardless of cover crop.
- Taxon
- Sweet Cornt0
- Treatment
- Half rates of atrazine and metolachlore0
- Interactor
- redroot pigweede0weed
- Outcome
- controlled redroot pigweede0
- Direction
- controllede0
- Qualifier
- regardless of cover crope0
Not reportedComparator
Verbatim
e0“Half rates of atrazine and metolachlor controlled redroot pigweed, Palmer amaranth, and goosegrass regardless of cover crop”
t0“Sweet Corn”
Claim · model-written summary
Half rates of atrazine and metolachlor controlled Palmer amaranth regardless of cover crop.
- Taxon
- Sweet Cornt0
- Treatment
- Half rates of atrazine and metolachlore0
- Interactor
- Palmer amaranthe0weed
- Outcome
- Palmer amaranthe0
- Direction
- controllede0
Not reportedComparator
Verbatim
e0“Half rates of atrazine and metolachlor controlled redroot pigweed, Palmer amaranth, and goosegrass regardless of cover crop”
t0“Sweet Corn”
Claim · model-written summary
Half rates of atrazine and metolachlor controlled goosegrass regardless of cover crop.
- Taxon
- Sweet Cornt0
- Treatment
- Half rates of atrazine and metolachlore0
- Interactor
- goosegrasse0weed
- Outcome
- goosegrasse0
- Direction
- controllede0
Not reportedComparator
Verbatim
e0“Half rates of atrazine and metolachlor controlled redroot pigweed, Palmer amaranth, and goosegrass regardless of cover crop”
t0“Sweet Corn”
Claim · model-written summary
Full rates of atrazine and metolachlor were needed to control large crabgrass in hairy vetch.
Verbatim
e0“Full rates of atrazine and metolachlor (2.2 + 2.2 kg ai ha −1 ) were needed to control large crabgrass in hairy vetch”
t0“Sweet Corn”
Claim · model-written summary
Yellow nutsedge control in hairy vetch was marginal even with full herbicide rates.
Verbatim
e0“Control of yellow nutsedge in hairy vetch was marginal even with full herbicide rates”
t0“Sweet Corn”
Claim · model-written summary
Yellow nutsedge population increased in the second year.
Verbatim
e0“Yellow nutsedge population increased and control with herbicides declined the second year”
t0“Sweet Corn”
Claim · model-written summary
Herbicide control of yellow nutsedge declined in the second year, particularly at half rates.
Verbatim
e0“Yellow nutsedge population increased and control with herbicides declined the second year, particularly with half rates of atrazine and metolachlor”
t0“Sweet Corn”
Claim · model-written summary
Cover crops other than hairy vetch alone reduced sweet corn emergence, height, and yield.
- Taxon
- sweet corne0
- Treatment
- All cover crops except hairy vetch alonee0
- Outcome
- emergence, height, and yield of sweet corne0
- Direction
- reducede0
Not reportedComparator
Verbatim
e0“All cover crops except hairy vetch alone reduced emergence, height, and yield of sweet corn”
Claim · model-written summary
Sweet corn yields at half rates of atrazine and metolachlor equalled yields at full rates regardless of cover crop.
Verbatim
e0“Sweet corn yields from half rates of atrazine and metolachlor equalled the full rates regardless of cover crops”
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See all 27 papers →8 of 13 groups shown: named compounds and organisms first, then groups whose results differ (checked claim by claim), then those with positive and negative results, then the smaller groups.
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.