Abstract
The influence of wheat variety on the dose-response of annual ryegrass to diclofop-methyl (POST) was examined in the field in 1992 and 1993 in southern New South Wales, Australia. The aim was to determine if planting a strongly competitive variety of wheat improved control of annual ryegrass at reduced doses of diclofop-methyl. Suppression of ryegrass was dependent on herbicide dose, season, and wheat variety. In the absence of herbicide, dry matter (DM) production of annual ryegrass at 300 plants m −2 at anthesis was 500 g ha −1 with Dollarbird and Katunga compared to 1000 g ha −1 with Rosella or Shrike in 1992. In 1993, DM was approximately 150 g ha −1 with Dollarbird or Katunga, and 350 g ha −1 with Shrike or Rosella. Ryegrass DM was reduced by diclofop-methyl to a greater extent, relative to the weedy unsprayed controls, with less competitive varieties Rosella and Shrike than with the more competitive Dollarbird or Katunga. Diclofop-methyl at 0.28 kg a.i. ha −1 reduced DM of ryegrass growing with Katunga to less than 100 g m −2 in 1992, compared to more than 200 g m 2 with the other varieties. In 1993, diclofop-methyl was more effective on ryegrass, and the same dose reduced ryegrass DM to almost zero in all varieties. Grain yields in unsprayed weedy controls of Dollarbird and Katunga were reduced approximately 20% by annual ryegrass compared with yields achieved with herbicides in both years. Yields of Rosella and Shrike in the unsprayed controls were reduced about 40% in 1992 and 60% in 1993. Only small increases in grain yields of all varieties occurred from diclofop-methyl doses above 0.13 kg a.i. ha −1 . Poorly competitive varieties were dependent on herbicides to achieve grain yield potential and had a greater risk of weed survival when herbicide efficacy was reduced. In contrast, strongly competitive varieties, likely to retard build-up of weed seed in the soil, are less dependent on herbicides to achieve grain yield potential, and therefore result in reduced weed control cost.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 11
Claim · model-written summary
Ryegrass suppression depended on herbicide dose, season and wheat variety.
- Taxon
- Wheat
Triticum aestivumt0 - Material
- wheat varietye0
- Outcome
- Suppression of ryegrasse0
LoliumNot reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Suppression of ryegrass was dependent on herbicide dose, season, and wheat variety”
t0“Wheat (Triticum aestivum) and Diclofop”
Claim · model-written summary
In 1992 without herbicide, ryegrass dry matter was 500 g ha −1 with Dollarbird and Katunga.
- Taxon
- WheatTriticum aestivumt0
- Material
- Dollarbird and Katungae0
- Interactor
- annual ryegrasse0weed
- Outcome
- dry matter (DM) production of annual ryegrasse0
- Direction
- lowerinferrede0
- Value
- 500 g ha −1e0
- Comparator
- Rosella or Shrikee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“dry matter (DM) production of annual ryegrass at 300 plants m −2 at anthesis was 500 g ha −1 with Dollarbird and Katunga compared to 1000 g ha −1 with Rosella or Shrike in 1992”
t0“Wheat”
Claim · model-written summary
In 1993 without herbicide, ryegrass dry matter was about 150 g ha −1 with Dollarbird or Katunga.
- Taxon
- WheatTriticum aestivumt0
- Material
- Dollarbird or Katungae0
- Interactor
- annual ryegrasse1weed
- Outcome
- DMe0
- Direction
- lowerinferrede0
- Value
- 150 g ha −1e0
- Comparator
- Shrike or Rosellae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 1993, DM was approximately 150 g ha −1 with Dollarbird or Katunga, and 350 g ha −1 with Shrike or Rosella”
e1“dose-response of annual ryegrass”
t0“Wheat”
Claim · model-written summary
Diclofop-methyl reduced ryegrass dry matter more strongly with Rosella and Shrike than with Dollarbird or Katunga.
- Taxon
- WheatTriticum aestivumt0
- Material
- Rosella and Shrikee0
- Treatment
- diclofop-methyle0
- Outcome
- Ryegrass DMe0
- Direction
- reducede0
- Comparator
- weedy unsprayed controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ryegrass DM was reduced by diclofop-methyl to a greater extent, relative to the weedy unsprayed controls, with less competitive varieties Rosella and Shrike than with the more competitive Dollarbird or Katunga”
t0“Wheat”
Claim · model-written summary
At 0.28 kg a.i. ha −1 in 1992, ryegrass dry matter with Katunga was below 100 g m −2 versus above 200 g m 2 with other varieties.
- Taxon
- WheatTriticum aestivumt0
- Material
- Katungae0
- Treatment
- Diclofop-methyl at 0.28 kg a.i. ha −1e0
- Outcome
- DM of ryegrasse0
- Direction
- reducede0
- Value
- less than 100 g m −2e0
- Comparator
- other varietiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Diclofop-methyl at 0.28 kg a.i. ha −1 reduced DM of ryegrass growing with Katunga to less than 100 g m −2 in 1992, compared to more than 200 g m 2 with the other varieties”
t0“Wheat”
Claim · model-written summary
In 1993 the same diclofop-methyl dose reduced ryegrass dry matter to nearly zero in all varieties.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- diclofop-methyle0
- Outcome
- ryegrass DMe0
- Direction
- reducede0
- Comparator
- weedy unsprayed controlse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 1993, diclofop-methyl was more effective on ryegrass, and the same dose reduced ryegrass DM to almost zero in all varieties”
e1“weedy unsprayed controls”
t0“Wheat”
Claim · model-written summary
Annual ryegrass reduced unsprayed Dollarbird and Katunga grain yields by approximately 20% in both years.
- Taxon
- WheatTriticum aestivumt0
- Material
- Dollarbird and Katungae0
- Treatment
- annual ryegrasse0
- Interactor
- annual ryegrasse0weed
- Outcome
- Grain yieldse0
- Direction
- reducede0
- Value
- approximately 20%e0
- Comparator
- yields achieved with herbicidese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yields in unsprayed weedy controls of Dollarbird and Katunga were reduced approximately 20% by annual ryegrass compared with yields achieved with herbicides in both years”
t0“Wheat”
Claim · model-written summary
Ryegrass reduced unsprayed Rosella and Shrike yields about 40% in 1992.
- Taxon
- WheatTriticum aestivumt0
- Material
- Rosella and Shrikee0
- Treatment
- annual ryegrasse1
- Interactor
- annual ryegrasse1weed
- Outcome
- Yieldse0
- Direction
- reducede0
- Value
- about 40%e0
- Comparator
- unsprayed controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yields of Rosella and Shrike in the unsprayed controls were reduced about 40% in 1992 and 60% in 1993”
e1“approximately 20% by annual ryegrass”
t0“Wheat”
Claim · model-written summary
Ryegrass reduced unsprayed Rosella and Shrike yields 60% in 1993.
- Taxon
- WheatTriticum aestivumt0
- Material
- Rosella and Shrikee0
- Treatment
- annual ryegrasse1
- Interactor
- annual ryegrasse1weed
- Outcome
- Yieldse0
- Direction
- reducede0
- Value
- 60%e0
- Comparator
- unsprayed controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yields of Rosella and Shrike in the unsprayed controls were reduced about 40% in 1992 and 60% in 1993”
e1“approximately 20% by annual ryegrass”
t0“Wheat”
Claim · model-written summary
Above 0.13 kg a.i. ha −1, diclofop-methyl gave only small additional grain-yield increases in all varieties.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- diclofop-methyl doses above 0.13 kg a.i. ha −1e0
- Outcome
- grain yieldse0
- Direction
- increasese0
- Comparator
- weedy unsprayed controlse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Only small increases in grain yields of all varieties occurred from diclofop-methyl doses above 0.13 kg a.i. ha −1”
e1“weedy unsprayed controls”
t0“Wheat”
Claim · model-written summary
The authors conclude that strongly competitive varieties reduce dependence on herbicide and weed-control cost.
- Taxon
- WheatTriticum aestivumt0
- Interactor
- weede0weed
- Outcome
- reduced weed control coste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“strongly competitive varieties, likely to retard build-up of weed seed in the soil, are less dependent on herbicides to achieve grain yield potential, and therefore result in reduced weed control cost”
t0“Wheat”
The same questions in other papers
diclofop-methyl · yield · Triticum aestivum (wheat)Positive and negative results
10 papers in the same direction as this paper · 4 in the opposite direction · 4 reporting no difference from an alternative
- negative
- negative
- negative
15 papers more in this group
See all 19 papers →diclofop-methyl · Lolium · Triticum aestivum (wheat)Results agree
1 paper in the same direction as this paper
- positive
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.