Abstract
A study was conducted during the summer season of 2015 and 2016 at, Gerua, with 10 weed-control practices, to evaluate the efficacy of different broad-spectrum herbicides and their combinations on performance of drum- seeded rice (Oryza sativa L.) in lowland ecosystem of Lower Brahmaputra Valley Zone of Asom. Results of the ex- periment revealed that Cyperus difformis L., Schoenoplectiella juncoides (Roxb.) Lye; syn, Scirpus juncoides Roxb. among sedges; Echinochloa crus-galli (L.) P. Beaur.; E. glabrescens, Leptochloa chinensis Kossenko (L.) Nees, among grasses; and Anagallis arvensis L. among broad-leaf weeds were dominant in drum-seeded rice. The composition of grasses, sedges and broad-leaf weeds in weedy check at 60 days after sowing (DAS) was 15.1, 71.5 and 13.4% respectively. Crop-weed competition throughout the crop-growth period caused 37.4% grain yield loss. Mechanical weeding by paddy weeder at 20 DAS followed by manual weeding at 40 DAS registered 9.2% lower grain yield than manual weeding twice. Weed-free condition by repeated manual weeding recorded the highest cost of cultivation of 45,000/ha, whereas bensulfuron-methyl + pretilachlor (60 + 600 g/ha) at 10 DAS re- sulted in the lowest cost of cultivation ( 36,000/ha). Though higher grain yield of 5.82 t/ha was recorded in weed- free plots, it did not record higher benefit: cost (B: C) ratio. Bensulfuron-methyl + pretilachlor (60 + 600 g/ha) at 10 DAS recorded the highest B : C ratio (2.28) followed by flucetosulfuron (25 g/ha) at 20 DAS (2.24).
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Claims 12
Claim · model-written summary
The listed sedges, grasses and broadleaf weeds dominated drum-seeded rice.
- Taxon
- rice
Oryza sativae0 - Interactor
- Cyperus difformis L.
Cyperus difformise0weed - Outcome
- dominante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cyperus difformis L., Schoenoplectiella juncoides (Roxb.) Lye; syn, Scirpus juncoides Roxb. among sedges; Echinochloa crus-galli (L.) P. Beaur.; E. glabrescens, Leptochloa chinensis Kossenko (L.) Nees, among grasses; and Anagallis arvensis L. among broad-leaf weeds were dominant in drum-seeded rice.”
Claim · model-written summary
At 60 days after sowing, sedges made up 71.5% of weeds in the weedy check.
- Taxon
- riceOryza sativat0
- Outcome
- sedgese0
- Value
- 71.5e0
- Qualifier
- weedy check at 60 days after sowing (DAS)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The composition of grasses, sedges and broad-leaf weeds in weedy check at 60 days after sowing (DAS) was 15.1, 71.5 and 13.4% respectively.”
t0“rice (Oryza sativa)”
Claim · model-written summary
At 60 days after sowing, grasses made up 15.1% of weeds in the weedy check.
- Taxon
- riceOryza sativat0
- Outcome
- grassese0
- Value
- 15.1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The composition of grasses, sedges and broad-leaf weeds in weedy check at 60 days after sowing (DAS) was 15.1, 71.5 and 13.4% respectively.”
t0“rice (Oryza sativa)”
Claim · model-written summary
At 60 days after sowing, broadleaf weeds made up 13.4% of weeds in the weedy check.
- Taxon
- riceOryza sativat0
- Outcome
- broad-leaf weedse0
- Value
- 13.4%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The composition of grasses, sedges and broad-leaf weeds in weedy check at 60 days after sowing (DAS) was 15.1, 71.5 and 13.4% respectively.”
t0“rice (Oryza sativa)”
Claim · model-written summary
Crop-weed competition throughout growth caused 37.4% rice grain yield loss.
- Taxon
- riceOryza sativat0
- Treatment
- Crop-weed competition throughout the crop-growth periode0
- Outcome
- grain yielde0
- Direction
- losse0
- Value
- 37.4%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Crop-weed competition throughout the crop-growth period caused 37.4% grain yield loss.”
t0“rice (Oryza sativa)”
Claim · model-written summary
Mechanical weeding at 20 DAS followed by manual weeding at 40 DAS gave 9.2% lower grain yield than two manual weedings.
- Treatment
- Mechanical weeding by paddy weeder at 20 DAS followed by manual weeding at 40 DASe0
- Outcome
- grain yielde0
- Direction
- lowere0
- Value
- 9.2%e0
- Comparator
- manual weeding twicee0
Not reportedTaxon
Verbatim
e0“Mechanical weeding by paddy weeder at 20 DAS followed by manual weeding at 40 DAS registered 9.2% lower grain yield than manual weeding twice.”
Claim · model-written summary
Repeated manual weeding had the highest cultivation cost, 45,000/ha.
Not reportedTaxon
Verbatim
e0“Weed-free condition by repeated manual weeding recorded the highest cost of cultivation of 45,000/ha”
Claim · model-written summary
Bensulfuron-methyl plus pretilachlor at 10 DAS had the lowest cultivation cost, 36,000/ha.
- Treatment
- bensulfuron-methyl + pretilachlor (60 + 600 g/ha) at 10 DASe0
- Outcome
- cost of cultivatione0
- Direction
- loweste0
- Value
- 36,000/hae0
Not reportedTaxon
Verbatim
e0“bensulfuron-methyl + pretilachlor (60 + 600 g/ha) at 10 DAS re- sulted in the lowest cost of cultivation ( 36,000/ha)”
Claim · model-written summary
Weed-free plots yielded 5.82 t/ha, the higher grain yield reported.
Not reportedTaxon
Verbatim
e0“higher grain yield of 5.82 t/ha was recorded in weed- free plots”
Claim · model-written summary
The weed-free plots did not have a higher benefit-cost ratio.
Not reportedTaxon
Verbatim
e0“it did not record higher benefit: cost (B: C) ratio.”
Claim · model-written summary
Bensulfuron-methyl plus pretilachlor at 10 DAS gave the highest benefit-cost ratio, 2.28.
- Treatment
- Bensulfuron-methyl + pretilachlor (60 + 600 g/ha) at 10 DASe0
- Outcome
- B : C ratioe0
- Direction
- higheste0
- Value
- 2.28e0
Not reportedTaxon
Verbatim
e0“Bensulfuron-methyl + pretilachlor (60 + 600 g/ha) at 10 DAS recorded the highest B : C ratio (2.28)”
Claim · model-written summary
Flucetosulfuron at 20 DAS produced a benefit-cost ratio of 2.24, second to the highest treatment.
- Treatment
- flucetosulfuron (25 g/ha) at 20 DASe0
- Outcome
- flucetosulfuron (25 g/ha) at 20 DASe0
- Value
- 2.24e0
Not reportedTaxon
Verbatim
e0“followed by flucetosulfuron (25 g/ha) at 20 DAS (2.24)”
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