Abstract
Experiments were conducted in two varieties of transplanted paddy (cv. Radha-4 and Neemai) during the rainy season of 2004-2005 in the Far-Western Terai region of Nepal to assess the effect of weed management practice. Four experiments were conducted in randomized block design with three replications viz. unweeded (T0), weed free (TT), manured plus twice hand-weeded after 25 and 50 days of transplanting (T1), and chemical fertilizer plus butachlor (weedicide) application (1.5 kg ha-1) (T2). A total of 48 weed species were identified with densities of 208 ind. m-2 in Radha-4 and 196 ind. m-2 in Neemai. The mean maximum biomass of paddy in weed-free plots were 3553.6 and 3588.4 g m-2 in Radha-4 and Neemai respectively. This biomass was more or less similar to twice hand-weeded plots and herbicide treated plots being 1.3% lowering in both the varieties, compared to weed-free plots. Compared to weed-free plots, the biomass reduction in unweeded plots was recorded 26.1% lower in Radha-4 and 26.3% in Neemai. The weed biomass was recorded highest in unweeded plots (296.9 and 236.2 g m-2) and lowest 155.7 and 109.1 g m-2 in twice hand-weeded plots. The trend of grain yield in both the varieties were: weed free (TT) > manured plus twice hand-weeded after 25 and 50 days of transplanting (T1) > chemical fertilizer plus butachlor application (1.5 kg/ha) (T2) > unweeded (T0).Key words: Rice; Weeds control; Western Terai; BiomassDOI: 10.3126/njst.v9i0.3157Nepal Journal of Science and Technology 9 (2008) 15-20
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Claims 14
Claim · model-written summary
Forty-eight weed species were identified in the paddy experiments.
Verbatim
t0“Paddy”
e0“A total of 48 weed species were identified with densities of 208 ind. m-2 in Radha-4 and 196 ind. m-2 in Neemai.”
Claim · model-written summary
Weed density was 208 individuals per square metre in Radha-4.
Verbatim
t0“Paddy”
e0“densities of 208 ind. m-2 in Radha-4 and 196 ind. m-2 in Neemai”
Claim · model-written summary
Weed density was 196 individuals per square metre in Neemai.
Verbatim
t0“Paddy”
e0“densities of 208 ind. m-2 in Radha-4 and 196 ind. m-2 in Neemai”
Claim · model-written summary
Maximum weed-free paddy biomass was 3553.6 g m-2 in Radha-4.
- Taxon
- Paddyt0
- Material
- Radha-4e0
- Treatment
- weed-free plotse0
- Outcome
- biomass of paddye0
- Direction
- maximume0
- Value
- 3553.6e0
Not reportedComparator
Verbatim
t0“Paddy”
e0“The mean maximum biomass of paddy in weed-free plots were 3553.6 and 3588.4 g m-2 in Radha-4 and Neemai respectively.”
Claim · model-written summary
Maximum weed-free paddy biomass was 3588.4 g m-2 in Neemai.
- Taxon
- Paddyt0
- Material
- Neemaie0
- Treatment
- weed-free plotse0
- Outcome
- biomass of paddye0
- Direction
- maximume0
- Value
- 3588.4 g m-2e0
Not reportedComparator
Verbatim
t0“Paddy”
e0“The mean maximum biomass of paddy in weed-free plots were 3553.6 and 3588.4 g m-2 in Radha-4 and Neemai respectively.”
Claim · model-written summary
Biomass under twice hand weeding was similar to weed-free plots.
Verbatim
t0“Paddy”
e0“This biomass was more or less similar to twice hand-weeded plots and herbicide treated plots being 1.3% lowering in both the varieties, compared to weed-free plots.”
Claim · model-written summary
Herbicide treated plots had biomass 1.3% below weed-free plots in both varieties.
Verbatim
t0“Paddy”
e0“herbicide treated plots being 1.3% lowering in both the varieties, compared to weed-free plots.”
Claim · model-written summary
Unweeded Radha-4 biomass was 26.1% below weed-free plots.
Verbatim
t0“Paddy”
e0“Compared to weed-free plots, the biomass reduction in unweeded plots was recorded 26.1% lower in Radha-4 and 26.3% in Neemai.”
Claim · model-written summary
Unweeded Neemai biomass was 26.3% below weed-free plots.
Verbatim
t0“Paddy”
e0“Compared to weed-free plots, the biomass reduction in unweeded plots was recorded 26.1% lower in Radha-4 and 26.3% in Neemai.”
Claim · model-written summary
Weed biomass was highest in unweeded plots at 296.9 g m-2 in Radha-4.
Not reportedMaterial
Verbatim
t0“Paddy”
e0“The weed biomass was recorded highest in unweeded plots (296.9 and 236.2 g m-2) and lowest 155.7 and 109.1 g m-2 in twice hand-weeded plots.”
Claim · model-written summary
Weed biomass was highest in unweeded plots at 236.2 g m-2 in Neemai.
Verbatim
t0“Paddy”
e0“The weed biomass was recorded highest in unweeded plots (296.9 and 236.2 g m-2) and lowest 155.7 and 109.1 g m-2 in twice hand-weeded plots.”
Claim · model-written summary
Weed biomass was lowest under twice hand weeding at 155.7 g m-2 in Radha-4.
Verbatim
t0“Paddy”
e0“The weed biomass was recorded highest in unweeded plots (296.9 and 236.2 g m-2) and lowest 155.7 and 109.1 g m-2 in twice hand-weeded plots.”
Claim · model-written summary
Weed biomass was lowest under twice hand weeding at 109.1 g m-2 in Neemai.
Verbatim
t0“Paddy”
e0“The weed biomass was recorded highest in unweeded plots (296.9 and 236.2 g m-2) and lowest 155.7 and 109.1 g m-2 in twice hand-weeded plots.”
Claim · model-written summary
Grain yield ranked weed free, twice hand weeded with manure, fertilizer plus butachlor, then unweeded in both varieties.
Verbatim
t0“Paddy”
e0“The trend of grain yield in both the varieties were: weed free (TT) > manured plus twice hand-weeded after 25 and 50 days of transplanting (T1) > chemical fertilizer plus butachlor application (1.5 kg/ha) (T2) > unweeded (T0).”
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