Abstract
Weed is one of the major yield-limiting factors in rice cultivation. It causes yield losses of around 40-90%, depending on the situation. Manual weeding is the dominant weed management method in rice and limited farmers use herbicides in Nepal. Selecting effective herbicides for different weed species is a crucial task for farmers. So, an experiment with 9 treatments consisting of 5 herbicides was conducted in RCB Design with 3 replications during 2020 and 2021 to find effective herbicides. The recommended agronomic practices were followed. Rice variety Khumal 11 was transplanted in a 4m x 3m plot with a spacing of 20 cm between rows and 15 cm between plants. Pooled data of two years showed the lowest weed density (14.2 m-2) and highest (73.2 m-2) in the treatment pretilachlor @ 0.5 kg ha-1 (pre) as sand mix and in the weedy check. Similarly, the lowest weed dry biomass (7.4 g m-2) and the highest (42.4 g-2) were recorded in the same treatments. The grain yield was the highest (7253 kg ha-1) in pretilachlor applied at 0.5 kg a.i ha-1 as pre-emergence spray and the lowest (4339 kg ha-1) in the control. The treatment pretilachlor @ 0.5 kg a.i ha-1 (pre) applied as spray was superior in managing weed and resulting in the highest grain yield, so it is recommended for mid-hill ecologies under transplanted rice.
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Claims 4
Claim · model-written summary
Pretilachlor sand mix had the lowest weed density, 14.2 m-2, versus 73.2 m-2 in the weedy check.
- Taxon
- Rice
Oryza sativat0 - Treatment
- pretilachlor @ 0.5 kg ha-1 (pre) as sand mixe0
- Interactor
- weede0weed
- Outcome
- weed densitye0
- Direction
- loweste0
- Value
- 14.2 m-2e0
- Comparator
- weedy checke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lowest weed density (14.2 m-2) and highest (73.2 m-2) in the treatment pretilachlor @ 0.5 kg ha-1 (pre) as sand mix and in the weedy check”
t0“Rice”
Claim · model-written summary
The same treatments yielded the lowest and highest weed dry biomass, respectively.
- Taxon
- RiceOryza sativat0
- Treatment
- pretilachlor @ 0.5 kg ha-1 (pre) as sand mixe1
- Interactor
- weede0weed
- Outcome
- weed dry biomasse0
- Direction
- loweste0
- Value
- 7.4 g m-2e0
- Comparator
- weedy checke1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lowest weed dry biomass (7.4 g m-2) and the highest (42.4 g-2) were recorded in the same treatments”
t0“Rice”
e1“pretilachlor @ 0.5 kg ha-1 (pre) as sand mix and in the weedy check”
Claim · model-written summary
Pre-emergence pretilachlor spray gave the highest grain yield, 7253 kg ha-1, versus 4339 kg ha-1 in control.
- Taxon
- RiceOryza sativat0
- Treatment
- pretilachlor applied at 0.5 kg a.i ha-1 as pre-emergence spraye0
- Outcome
- grain yielde0
- Direction
- higheste0
- Value
- 7253 kg ha-1e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“grain yield was the highest (7253 kg ha-1) in pretilachlor applied at 0.5 kg a.i ha-1 as pre-emergence spray and the lowest (4339 kg ha-1) in the control”
t0“Rice”
Claim · model-written summary
The authors recommend pre-emergence pretilachlor spray for transplanted rice in mid-hill ecologies.
- Taxon
- riceOryza sativae0
- Outcome
- recommended for mid-hill ecologies under transplanted ricee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“pretilachlor @ 0.5 kg a.i ha-1 (pre) applied as spray was superior in managing weed and resulting in the highest grain yield, so it is recommended for mid-hill ecologies under transplanted rice”
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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.