Abstract
Cogongrass is an aggressive perennial weed, which causes severe yield losses in major crops of the moist savanna of West Africa. Field studies were conducted from 2000 to 2002 at Alabata and Ilorin, Nigeria, to evaluate the influence of dosage and time of nicosulfuron application on the control of cogongrass and corn grain yield. Nicosulfuron dosages were 50, 100, 150, and 200 g ai/ha applied 1, 2, 3, or 4 wk after planting (WAP) corn. Hand-weeded and nonweeded treatments were the controls. Three to 4 wk after treatment and at final harvest, all plots that received nicosulfuron had significantly lower cogongrass shoot dry matter (DM) than the nonweeded control across locations in all years (P ≤ 0.01). Nicosulfuron increased corn grain yield at Alabata by 96% in 2000, 100% in 2001, and 34 to 54% in 2002, and at Ilorin by 79 to 83% in 2001 and 60 to 69% in 2002 when compared with the nonweeded control. The weeded control had corn grain yield similar to plots that received nicosulfuron at 200 g/ha at Alabata in 2001, 150 g/ha at Ilorin in 2001, 50 to 200 g/ha at Alabata in 2002, and 150 and 200 g/ha at Ilorin in 2002. There were negative linear relationships between corn DM, grain yield, and cogongrass shoot DM. Application of nicosulfuron at 1 or 2 WAP, when cogongrass was 22 to 27 cm tall, gave better grain yield and lower cogongrass shoot DM than at 3 or 4 WAP, when cogongrass was 36 to 45 cm tall. The study concludes that 150 to 200 g/ha of nicosulfuron applied at 1 or 2 WAP is effective for cogongrass control without adverse effect on corn grain yield.Nomenclature: Nicosulfuron; cogongrass, Imperata cylindrica (L.) Beauv. #3 IMPCY; corn, Zea mays L.Additional index words: Crop injury, sulfonylurea herbicide, weed competition.Abbreviations: DM, dry matter; WAP, weeks after planting; WAT, weeks after treatment.
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Claims 9
Claim · model-written summary
Nicosulfuron plots had significantly lower cogongrass shoot dry matter than nonweeded plots across sites and years.
- Taxon
- corn
Zea mays subsp. mayst0 - Treatment
- nicosulfurone0
- Interactor
- cogongrasse0weed
- Outcome
- cogongrass shoot dry matter (DM)e0
- Direction
- lowere0
- Comparator
- nonweeded controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“all plots that received nicosulfuron had significantly lower cogongrass shoot dry matter (DM) than the nonweeded control across locations in all years (P ≤ 0.01)”
t0“Corn”
Claim · model-written summary
Nicosulfuron raised corn grain yield at Alabata by 96% in 2000.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Nicosulfurone0
- Outcome
- corn grain yielde0
- Direction
- increasede0
- Value
- 96%e0
- Comparator
- nonweeded controle1
- Setting
- Alabatae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nicosulfuron increased corn grain yield at Alabata by 96% in 2000”
e1“when compared with the nonweeded control”
Claim · model-written summary
Nicosulfuron raised corn grain yield at Alabata by 100% in 2001.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Nicosulfurone0
- Outcome
- corn grain yielde0
- Direction
- increasede0
- Value
- 100%e0
- Comparator
- nonweeded controle1
- Setting
- Alabatae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nicosulfuron increased corn grain yield at Alabata by 96% in 2000, 100% in 2001”
e1“when compared with the nonweeded control”
Claim · model-written summary
Nicosulfuron raised corn grain yield at Alabata by 34 to 54% in 2002.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Nicosulfurone0
- Outcome
- corn grain yielde0
- Direction
- increasede0
- Value
- 34 to 54%e0
- Comparator
- nonweeded controle1
- Setting
- Alabatae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nicosulfuron increased corn grain yield at Alabata by 96% in 2000, 100% in 2001, and 34 to 54% in 2002”
e1“when compared with the nonweeded control”
Claim · model-written summary
Nicosulfuron raised corn grain yield at Ilorin by 79 to 83% in 2001.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- Nicosulfurone1
- Outcome
- corn grain yielde1
- Direction
- increasede1
- Value
- 79 to 83%e0
- Comparator
- nonweeded controle0
- Setting
- Ilorine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at Ilorin by 79 to 83% in 2001 and 60 to 69% in 2002 when compared with the nonweeded control”
e1“Nicosulfuron increased corn grain yield”
t0“Corn”
Claim · model-written summary
Nicosulfuron raised corn grain yield at Ilorin by 60 to 69% in 2002.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- Nicosulfurone1
- Outcome
- corn grain yielde1
- Direction
- increasede1
- Value
- 60 to 69%e0
- Comparator
- nonweeded controle0
- Setting
- Ilorine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at Ilorin by 79 to 83% in 2001 and 60 to 69% in 2002 when compared with the nonweeded control”
e1“Nicosulfuron increased corn grain yield”
t0“Corn”
Claim · model-written summary
Corn dry matter and grain yield were negatively related to cogongrass shoot dry matter.
- Taxon
- cornZea mays subsp. mayse0
- Interactor
- cogongrasse0weed
- Outcome
- corn DM, grain yielde0
- Direction
- negativee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were negative linear relationships between corn DM, grain yield, and cogongrass shoot DM”
Claim · model-written summary
Application at one or two weeks gave better grain yield than at three or four weeks.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- nicosulfuron at 1 or 2 WAPe0
- Outcome
- grain yielde0
- Direction
- bettere0
- Comparator
- at 3 or 4 WAPe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of nicosulfuron at 1 or 2 WAP, when cogongrass was 22 to 27 cm tall, gave better grain yield and lower cogongrass shoot DM than at 3 or 4 WAP”
t0“Corn”
Claim · model-written summary
Application at one or two weeks gave lower cogongrass shoot dry matter than later application.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- nicosulfuron at 1 or 2 WAPe0
- Interactor
- cogongrasse0weed
- Outcome
- cogongrass shoot DMe0
- Direction
- lowere0
- Comparator
- at 3 or 4 WAPe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of nicosulfuron at 1 or 2 WAP, when cogongrass was 22 to 27 cm tall, gave better grain yield and lower cogongrass shoot DM than at 3 or 4 WAP”
t0“Corn”
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See all 31 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.