Abstract
A study was conducted from June to December 2003 to assess weed dynamics and yield performance of transplanted aman rice (cv. BRRI Dhan39) in different weed control treatments e.g. two hand weedings at 15 and 40 DAT; Weeding by BRRI Weeder at 20 and 40 DAT; Rifit 500EC @ 1L/ha at 7 DAT; Rifit 500EC @ 1 L/ha at 7 DAT and one hand weeding at 40 DAT; Butachlor 5G @ 2 kg/ha at 7 DAT; Butachlor 5G @ 2 kg/ha at 7 DAT and one hand weeding at 40 DAT along with weed free and unweeded check under both good and poor water management practices. Weed density, weed biomass and weed control efficiency were significantly influenced by different weed control treatments under both water management practices. Other than weed free treatment, Butachlor 5G @ 2 kg/ha applied at 7 DAT along with one hand weeding at 40 DAT showed the best performance under good water management with minimum weed density (16 g/m2) as well as weed biomass (9.27 g/m2) and the highest weed control efficiency (82.57%). Yield and yield components were also significantly influenced by different weed control treatments and water management. The highest grain yield (5.22 t/ha) was obtained under good water management in weed free treatment followed by Butachlor 5G @ 2 kg/ ha and one hand weeding (4.96 t/ha) under same water management. Results revealed that integration of approaches, particularly Butachlor application along with one manual weeding accompanied by proper water management might be the best option to combat weed problems as well as to obtain satisfactory grain yield in transplanted aman rice. Key Words: Transplanted aman rice, water management, weed control treatment and yield. doi:10.3329/bjar.v33i3.1599 Bangladesh J. Agril. Res. 33(3) : 399-408, September 2008
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Claims 8
Claim · model-written summary
Weed density, weed biomass and weed control efficiency in transplanted aman rice were significantly influenced by the weed control treatments under both water management practices.
- Taxon
- transplanted aman ricee0
- Treatment
- different weed control treatmentse1
- Interactor
- weede1weed
- Outcome
- Weed density, weed biomass and weed control efficiencye1
- Qualifier
- under both water management practicese1
Not reportedComparatorDirection
Verbatim
e0“to assess weed dynamics and yield performance of transplanted aman rice (cv. BRRI Dhan39)”
e1“Weed density, weed biomass and weed control efficiency were significantly influenced by different weed control treatments under both water management practices”
Claim · model-written summary
Butachlor 5G at 2 kg/ha applied at 7 DAT with one hand weeding at 40 DAT gave the minimum weed density (16 g/m2) under good water management in transplanted aman rice.
- Taxon
- transplanted aman ricee0
- Treatment
- Butachlor 5G @ 2 kg/ha applied at 7 DAT along with one hand weeding at 40 DATe2
- Interactor
- weede2weed
- Outcome
- weed densitye2
- Direction
- minimume2
- Value
- 16 g/m2e2
- Qualifier
- good water managemente2
Not reportedComparator
Verbatim
e0“to assess weed dynamics and yield performance of transplanted aman rice (cv. BRRI Dhan39)”
e2“Butachlor 5G @ 2 kg/ha applied at 7 DAT along with one hand weeding at 40 DAT showed the best performance under good water management with minimum weed density (16 g/m2) as well as weed biomass (9.27 g/m2) and the highest weed control efficiency (82.57%)”
Claim · model-written summary
Butachlor 5G at 2 kg/ha applied at 7 DAT with one hand weeding at 40 DAT gave the lowest weed biomass (9.27 g/m2) under good water management in transplanted aman rice.
- Taxon
- transplanted aman ricee0
- Treatment
- Butachlor 5G @ 2 kg/ha applied at 7 DAT along with one hand weeding at 40 DATe2
- Interactor
- weede2weed
- Outcome
- weed biomasse2
- Direction
- lowerinferrede2
- Value
- 9.27 g/m2e2
- Qualifier
- good water managemente2
Not reportedComparator
Verbatim
e0“to assess weed dynamics and yield performance of transplanted aman rice (cv. BRRI Dhan39)”
e2“Butachlor 5G @ 2 kg/ha applied at 7 DAT along with one hand weeding at 40 DAT showed the best performance under good water management with minimum weed density (16 g/m2) as well as weed biomass (9.27 g/m2) and the highest weed control efficiency (82.57%)”
Claim · model-written summary
Butachlor 5G at 2 kg/ha applied at 7 DAT with one hand weeding at 40 DAT gave the highest weed control efficiency (82.57%) under good water management in transplanted aman rice.
- Taxon
- transplanted aman ricee0
- Treatment
- Butachlor 5G @ 2 kg/ha applied at 7 DAT along with one hand weeding at 40 DATe2
- Interactor
- weede2weed
- Outcome
- weed control efficiencye2
- Direction
- higheste2
- Value
- 82.57%e2
- Qualifier
- good water managemente2
Not reportedComparator
Verbatim
e0“to assess weed dynamics and yield performance of transplanted aman rice (cv. BRRI Dhan39)”
e2“Butachlor 5G @ 2 kg/ha applied at 7 DAT along with one hand weeding at 40 DAT showed the best performance under good water management with minimum weed density (16 g/m2) as well as weed biomass (9.27 g/m2) and the highest weed control efficiency (82.57%)”
Claim · model-written summary
The highest grain yield (5.22 t/ha) in transplanted aman rice was obtained in the weed free treatment under good water management.
- Taxon
- transplanted aman ricee0
- Treatment
- weed free treatmente6
- Outcome
- grain yielde6
- Direction
- higheste6
- Value
- 5.22 t/hae6
- Qualifier
- under good water managemente6
Not reportedComparator
Verbatim
e0“to assess weed dynamics and yield performance of transplanted aman rice (cv. BRRI Dhan39)”
e6“The highest grain yield (5.22 t/ha) was obtained under good water management in weed free treatment”
Claim · model-written summary
Butachlor 5G at 2 kg/ha with one hand weeding gave the next-highest grain yield (4.96 t/ha) under the same water management in transplanted aman rice.
- Taxon
- transplanted aman ricee0
- Treatment
- Butachlor 5G @ 2 kg/ ha and one hand weedinge7
- Outcome
- grain yielde6
- Direction
- higherinferrede7
- Value
- 4.96 t/hae7
- Qualifier
- under same water managemente7
Not reportedComparator
Verbatim
e0“to assess weed dynamics and yield performance of transplanted aman rice (cv. BRRI Dhan39)”
e6“The highest grain yield (5.22 t/ha) was obtained under good water management in weed free treatment”
e7“followed by Butachlor 5G @ 2 kg/ ha and one hand weeding (4.96 t/ha) under same water management”
Claim · model-written summary
Yield and yield components of transplanted aman rice were significantly influenced by the weed control treatments and water management.
- Taxon
- transplanted aman ricee0
- Treatment
- different weed control treatments and water managemente5
- Outcome
- Yield and yield componentse5
Not reportedComparatorDirection
Verbatim
e0“to assess weed dynamics and yield performance of transplanted aman rice (cv. BRRI Dhan39)”
e5“Yield and yield components were also significantly influenced by different weed control treatments and water management”
Claim · model-written summary
Butachlor application with one manual weeding and proper water management is recommended as the best option to combat weed problems in transplanted aman rice.
Verbatim
e0“to assess weed dynamics and yield performance of transplanted aman rice (cv. BRRI Dhan39)”
e7“integration of approaches, particularly Butachlor application along with one manual weeding accompanied by proper water management might be the best option to combat weed problems”
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