Abstract
Field research was conducted at Columbia and Novelty, MO, to determine the impact of winter-annual weed management systems on corn and soybean grain yields, winter-annual weed control, and soybean cyst nematode (SCN) egg population densities over the crop production cycle. Corn grain yield was not affected by winter-annual weed management systems. Soybean grain yield was not affected by winter weed management systems in 2001, but at Columbia in 2002 winter rye and Italian ryegrass reduced soybean grain yield 62 and 64%, respectively. Fall-applied simazine + tribenuron in corn and chlorimuron + sulfentrazone in soybean controlled winter-annual weeds greater than 99%. Fall-overseeded winter rye and Italian ryegrass in corn and overseeded Italian ryegrass in soybean controlled winter weeds 66 to 86%. In the soybean studies, race 4 SCN population densities increased (P = 0.08) in the nontreated control and remained stable (P = 0.55) with fall-applied chlorimuron + sulfentrazone from fall 2001 to spring 2002 while SCN population densities were reduced (P = 0.06) with spring-applied chlorimuron + sulfentrazone from fall 2002 to spring 2003. In the corn studies, none of the winter-annual weed management strategies reduced (P > 0.22) race 2 SCN population densities except winter rye from fall 2001 to spring 2002 (P = 0.05). This research indicates that control of weed species considered to be weak alternative hosts for SCN affected SCN population densities some instances when race 4 SCN population densities were high in a continuous soybean production system or race 2 SCN population densities were low in a 2-yr corn production system.
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Claims 13
Claim · model-written summary
Corn grain yield was not affected by winter-annual weed management systems.
- Taxon
- Corn
Zea mays subsp. mayse0 - Treatment
- winter-annual weed management systemse0
- Outcome
- grain yielde0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Corn grain yield was not affected by winter-annual weed management systems”
Claim · model-written summary
Soybean grain yield was not affected by winter weed management systems in 2001.
- Taxon
- Soybean
Glycine maxe1 - Treatment
- winter weed management systemse1
- Outcome
- grain yielde1
- Direction
- not affectede1
- Qualifier
- in 2001e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Soybean grain yield was not affected by winter weed management systems in 2001”
Claim · model-written summary
At Columbia in 2002, winter rye reduced soybean grain yield by 62%.
- Taxon
- soybeanGlycine maxe2
- Treatment
- winter ryee2
- Outcome
- grain yielde2
- Direction
- reducede2
- Value
- 62e2
- Setting
- Columbiae2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“at Columbia in 2002 winter rye and Italian ryegrass reduced soybean grain yield 62 and 64%, respectively”
Claim · model-written summary
At Columbia in 2002, Italian ryegrass reduced soybean grain yield by 64%.
- Taxon
- soybeanGlycine maxe2
- Treatment
- Italian ryegrasse2
- Outcome
- grain yielde2
- Direction
- reducede2
- Value
- 64%e2
- Setting
- Columbiae2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“at Columbia in 2002 winter rye and Italian ryegrass reduced soybean grain yield 62 and 64%, respectively”
Claim · model-written summary
Fall-applied simazine + tribenuron in corn controlled winter-annual weeds by more than 99%.
- Taxon
- cornZea mays subsp. mayse3
- Treatment
- Fall-applied simazine + tribenurone3
- Outcome
- winter-annual weedse3
- Direction
- controllede3
- Value
- greater than 99%e3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Fall-applied simazine + tribenuron in corn and chlorimuron + sulfentrazone in soybean controlled winter-annual weeds greater than 99%”
Claim · model-written summary
Chlorimuron + sulfentrazone in soybean controlled winter-annual weeds by more than 99%.
- Taxon
- soybeanGlycine maxe3
- Treatment
- chlorimuron + sulfentrazonee3
- Outcome
- winter-annual weedse3
- Direction
- controllede3
- Value
- greater than 99%e3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Fall-applied simazine + tribenuron in corn and chlorimuron + sulfentrazone in soybean controlled winter-annual weeds greater than 99%”
Claim · model-written summary
Fall-overseeded winter rye and Italian ryegrass in corn controlled winter weeds by 66 to 86%.
- Taxon
- cornZea mays subsp. mayse4
- Treatment
- Fall-overseeded winter rye and Italian ryegrasse4
- Outcome
- winter weedse4
- Direction
- controllede4
- Value
- 66 to 86%e4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Fall-overseeded winter rye and Italian ryegrass in corn and overseeded Italian ryegrass in soybean controlled winter weeds 66 to 86%”
Claim · model-written summary
Overseeded Italian ryegrass in soybean controlled winter weeds by 66 to 86%.
- Taxon
- soybeanGlycine maxe4
- Treatment
- overseeded Italian ryegrasse4
- Outcome
- winter weedse4
- Direction
- controllede4
- Value
- 66 to 86%e4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Fall-overseeded winter rye and Italian ryegrass in corn and overseeded Italian ryegrass in soybean controlled winter weeds 66 to 86%”
Claim · model-written summary
In soybean, race 4 SCN population densities increased (P = 0.08) in the nontreated control.
- Taxon
- soybeanGlycine maxe5
- Interactor
- SCNe5pathogen
- Outcome
- race 4 SCN population densitiese5
- Direction
- increasede5
- Qualifier
- in the nontreated controle5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“In the soybean studies, race 4 SCN population densities increased (P = 0.08) in the nontreated control”
Claim · model-written summary
In soybean, race 4 SCN population densities remained stable (P = 0.55) with fall-applied chlorimuron + sulfentrazone from fall 2001 to spring 2002.
- Taxon
- soybeanGlycine maxe5
- Treatment
- fall-applied chlorimuron + sulfentrazonee6
- Interactor
- SCNe6pathogen
- Outcome
- race 4 SCN population densitiese6
- Direction
- remained stablee6
- Qualifier
- from fall 2001 to spring 2002e6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“In the soybean studies”
e6“race 4 SCN population densities increased (P = 0.08) in the nontreated control and remained stable (P = 0.55) with fall-applied chlorimuron + sulfentrazone from fall 2001 to spring 2002”
Claim · model-written summary
In soybean, SCN population densities were reduced (P = 0.06) with spring-applied chlorimuron + sulfentrazone from fall 2002 to spring 2003.
- Taxon
- soybeanGlycine maxe5
- Treatment
- spring-applied chlorimuron + sulfentrazonee7
- Interactor
- SCNe7pathogen
- Outcome
- SCN population densitiese7
- Direction
- reducede7
- Qualifier
- from fall 2002 to spring 2003e7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“In the soybean studies”
e7“SCN population densities were reduced (P = 0.06) with spring-applied chlorimuron + sulfentrazone from fall 2002 to spring 2003”
Claim · model-written summary
In corn, none of the winter-annual weed management strategies reduced race 2 SCN population densities (P > 0.22), except winter rye.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- winter-annual weed management strategiese0
- Interactor
- SCNe0pathogen
- Outcome
- race 2 SCN population densitiese0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the corn studies, none of the winter-annual weed management strategies reduced (P > 0.22) race 2 SCN population densities”
Claim · model-written summary
In corn, winter rye reduced race 2 SCN population densities from fall 2001 to spring 2002 (P = 0.05).
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- winter ryee0
- Interactor
- SCNe0pathogen
- Outcome
- race 2 SCN population densitiese0
- Direction
- reducede0
- Qualifier
- from fall 2001 to spring 2002e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the corn studies, none of the winter-annual weed management strategies reduced (P > 0.22) race 2 SCN population densities except winter rye from fall 2001 to spring 2002 (P = 0.05)”
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See all 44 papers →8 of 10 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.