Abstract
The control of crop grass weeds is a major limitation to the successful production of oats in Southern Australia. This is due to the combination of few registered herbicide options and limited knowledge on their effectiveness, coupled with effects of management, for different cultivars. Five trials with 6 cultivars were conducted between 1997 and 2001 in the southern wheatbelt of Western Australia to examine this problem. In a herbicide tolerance screen the yields of the cultivars Mortlock, Toodyay and Needilup were not reduced by any herbicide options tested and were therefore more tolerant to the chemical applications. The yields of the cultivar Hotham however, were reduced by all herbicide treatments except the safest treatments, indicating this cultivar is more sensitive. In the presence of weeds, the yields of Hotham and Needilup were not reduced by herbicides but had relatively high in crop weed biomass and therefore, can be regarded as both poor weed competitors and herbicide tolerant. The crop weed biomass of Mortlock and Toodyay was low and yield wasn t reduced by any of the herbicide options, therefore both were tolerant to the herbicides and competitive with weeds. Needilup had the strongest relationship between weed biomass and grain yield (R2=0.80) indicating that Needilup is more responsive than the other varieties tested to changes in weed biomass whilst less sensitive to herbicides. Two management practices to reduce weed competition were assessed, delayed sowing and increasing crop plant density. Utilising the delayed sowing allowed an extra knockdown herbicide to be applied and resulted in an average grain yield increase of 1.5 t/ha and weed biomass reduction of 1 t/ha. When the target plant population was increased in the presence of weeds, weed biomass was reduced and grain yield was increased. Through the utilisation of alternative herbicides and changes in management, grass weeds can be effectively controlled in oat crops without reliance on a small number of herbicides (e.g. sulfonylureas).
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Claims 12
Claim · model-written summary
Mortlock, Toodyay and Needilup yields were not reduced by tested herbicides.
- Taxon
- oats
Avena sativae1 - Material
- Mortlock, Toodyay and Needilupe0
- Treatment
- herbicide optionse0
- Outcome
- yieldse0
- Direction
- not reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the yields of the cultivars Mortlock, Toodyay and Needilup were not reduced by any herbicide options tested”
e1“oats in Southern Australia”
Claim · model-written summary
Hotham yield was reduced by herbicide treatments except the safest treatments.
- Taxon
- oatsAvena sativae1
- Material
- Hothame0
- Treatment
- herbicide treatmentse0
- Outcome
- yieldse0
- Direction
- reducede0
- Comparator
- the safest treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The yields of the cultivar Hotham however, were reduced by all herbicide treatments except the safest treatments”
e1“oats in Southern Australia”
Claim · model-written summary
Hotham and Needilup yields were not reduced by herbicides in the presence of weeds.
- Taxon
- oatsAvena sativae1
- Material
- Hotham and Needilupe0
- Treatment
- herbicidese0
- Outcome
- yieldse0
- Direction
- not reducede0
- Qualifier
- In the presence of weedse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the presence of weeds, the yields of Hotham and Needilup were not reduced by herbicides”
e1“oats in Southern Australia”
Claim · model-written summary
Hotham and Needilup had relatively high in-crop weed biomass.
- Taxon
- oatsAvena sativae1
- Outcome
- in crop weed biomasse0
- Direction
- relatively highe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“had relatively high in crop weed biomass”
e1“oats in Southern Australia”
Claim · model-written summary
Mortlock and Toodyay had low crop weed biomass.
- Taxon
- oatsAvena sativae1
- Material
- Mortlock and Toodyaye0
- Outcome
- crop weed biomasse0
- Direction
- lowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The crop weed biomass of Mortlock and Toodyay was low”
e1“oats in Southern Australia”
Claim · model-written summary
Mortlock and Toodyay yield was not reduced by herbicide options.
- Taxon
- oatsAvena sativae1
- Treatment
- herbicide optionse0
- Outcome
- yielde0
- Direction
- wasn t reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield wasn t reduced by any of the herbicide options”
e1“oats in Southern Australia”
Claim · model-written summary
Needilup weed biomass and grain yield had the strongest reported relationship, R2=0.80.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Needilup had the strongest relationship between weed biomass and grain yield (R2=0.80)”
e1“oats in Southern Australia”
Claim · model-written summary
Delayed sowing with an extra knockdown herbicide increased grain yield by 1.5 t/ha on average.
- Taxon
- oatsAvena sativae1
- Treatment
- delayed sowinge0
- Outcome
- grain yielde0
- Direction
- increasee0
- Value
- 1.5 t/hae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Utilising the delayed sowing allowed an extra knockdown herbicide to be applied and resulted in an average grain yield increase of 1.5 t/ha”
e1“oats in Southern Australia”
Claim · model-written summary
Delayed sowing reduced weed biomass by 1 t/ha.
- Taxon
- oatsAvena sativae1
- Treatment
- delayed sowinge0
- Outcome
- weed biomasse0
- Direction
- reductione0
- Value
- 1 t/hae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“delayed sowing allowed an extra knockdown herbicide to be applied and resulted in an average grain yield increase of 1.5 t/ha and weed biomass reduction of 1 t/ha”
e1“oats in Southern Australia”
Claim · model-written summary
Increasing target plant population reduced weed biomass in the presence of weeds.
- Taxon
- oatsAvena sativae1
- Treatment
- target plant population was increasede0
- Outcome
- weed biomasse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When the target plant population was increased in the presence of weeds, weed biomass was reduced”
e1“oats in Southern Australia”
Claim · model-written summary
Increasing target plant population increased grain yield in the presence of weeds.
- Taxon
- oatsAvena sativae1
- Treatment
- target plant population was increasede0
- Outcome
- grain yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When the target plant population was increased in the presence of weeds, weed biomass was reduced and grain yield was increased”
e1“oats in Southern Australia”
Claim · model-written summary
The authors conclude that alternative herbicides and management changes can control grass weeds in oat crops.
- Taxon
- oatAvena sativae0
- Outcome
- grass weeds can be effectively controllede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Through the utilisation of alternative herbicides and changes in management, grass weeds can be effectively controlled in oat crops without reliance on a small number of herbicides”
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See all 5 papers →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.