Abstract
BACKGROUND: A number of techniques, including cultural management, allelopathy and bioherbicide, have been considered as alternatives for synthetic herbicides, but successful weed control will require the careful integration of these multiple techniques. This study was conducted to assess the use of allelopathic rice varieties in combination with cultural management options on paddy weeds, in order to develop an allelopathy-based technique to reduce herbicide use in paddies. RESULTS: The weed-suppressive effects of the rice varieties tested varied highly with allelopathic trait, planting pattern and cultural management including planting density, flooding depth and duration and supply of nitrogen. Allelopathic rice varieties PI312777 and Huagan-1 demonstrated much stronger weed suppression than the non-allelopathic variety Huajianxian under the same planting pattern and cultural management. Their weed-suppressive effect was increased with cultural management options. In particular, if integrated cultural management options of allelopathic rice varieties included a low-dose (bensulfuron-methyl, 25 g AI ha(-1), a third of the recommended dose) herbicide application, the emergence and growth of most weeds found in paddy fields was completely controlled. No grain yield reduction for allelopathic varieties occurred under integrated cultural management options, whereas with the non-allelopathic variety a reduction of up to 45-60% was measurable even with the low-dose herbicide application. CONCLUSION: The allelopathic potential of rice varieties will likely have a great impact on paddy weed control if integrated with cultural management options and application of low doses of herbicides. Therefore, it is feasible to reduce herbicide input in paddies if allelopathic rice is grown under integrated cultural management practices.
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Claims 7
Claim · model-written summary
Allelopathic rice varieties tested suppressed paddy weeds to a degree that varied with planting pattern and cultural management.
- Taxon
- rice
Oryza sativae1 - Treatment
- planting pattern and cultural managemente1
- Interactor
- paddy field weedst1weed
- Outcome
- weed-suppressive effectse1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t1“paddy field weeds”
e1“The weed-suppressive effects of the rice varieties tested varied highly with allelopathic trait, planting pattern and cultural management including planting density, flooding depth and duration and supply of nitrogen”
Claim · model-written summary
Allelopathic rice varieties PI312777 and Huagan-1 showed much stronger weed suppression than the non-allelopathic variety Huajianxian.
- Taxon
- riceOryza sativae2
- Material
- PI312777 and Huagan-1e2
- Treatment
- Allelopathic rice varietiese2
- Interactor
- paddy field weedst1weed
- Outcome
- weed suppressione2
- Direction
- much strongere2
- Qualifier
- under the same planting pattern and cultural managemente2
- Comparator
- non-allelopathic variety Huajianxiane2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t1“paddy field weeds”
e2“Allelopathic rice varieties PI312777 and Huagan-1 demonstrated much stronger weed suppression than the non-allelopathic variety Huajianxian under the same planting pattern and cultural management”
Claim · model-written summary
Weed-suppressive effect of allelopathic rice increased with cultural management options.
- Taxon
- riceOryza sativat0
- Treatment
- cultural management optionse3
- Outcome
- weed-suppressive effecte3
- Direction
- increasede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“allelopathic rice varieties”
e3“Their weed-suppressive effect was increased with cultural management options”
Claim · model-written summary
A low-dose herbicide application within integrated management completely controlled emergence and growth of most paddy weeds.
- Taxon
- riceOryza sativae4
- Treatment
- low-dose (bensulfuron-methyl, 25 g AI ha(-1), a third of the recommended dose) herbicide applicatione4
- Interactor
- weedse4weed
- Outcome
- emergence and growth of most weedse4
- Direction
- completely controllede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“allelopathic rice varieties”
e4“if integrated cultural management options of allelopathic rice varieties included a low-dose (bensulfuron-methyl, 25 g AI ha(-1), a third of the recommended dose) herbicide application, the emergence and growth of most weeds found in paddy fields was completely controlled”
Claim · model-written summary
Allelopathic rice varieties under integrated cultural management showed no grain yield reduction.
- Taxon
- riceOryza sativat0
- Treatment
- integrated cultural management optionse5
- Outcome
- grain yield reductione5
- Direction
- Noe5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“allelopathic rice varieties”
e5“No grain yield reduction for allelopathic varieties occurred under integrated cultural management options”
Claim · model-written summary
The non-allelopathic variety showed a grain yield reduction of up to 45-60% even with the low-dose herbicide application.
- Taxon
- riceOryza sativat0
- Material
- non-allelopathic varietye6
- Treatment
- low-dose herbicide applicatione6
- Outcome
- grain yielde5
- Direction
- reductione6
- Value
- 45-60%e6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“allelopathic rice varieties”
e5“No grain yield reduction for allelopathic varieties occurred under integrated cultural management options”
e6“whereas with the non-allelopathic variety a reduction of up to 45-60% was measurable even with the low-dose herbicide application”
Claim · model-written summary
Reducing herbicide input in paddies is feasible when allelopathic rice is grown under integrated cultural management.
- Taxon
- riceOryza sativae7
- Outcome
- reduce herbicide input in paddiese7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“allelopathic rice varieties”
e7“it is feasible to reduce herbicide input in paddies if allelopathic rice is grown under integrated cultural management practices”
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