Abstract
The effect of chlormequat on the grain yield of wheat was investigated in 24 field experiments between 1981 and 1983. Two times of application (at the 3.5- and 6-leaf growth stages-Zadoks decimal score 13.5 and 16.0) and rates of application up to 0.75 kg/ha a.i. were tested with two chlormequat formulations, Cycocel 750 and Bettaquat. Chlormequat application reduced crop height in all trials, but crop lodging did not occur in any trial. Statistically significant yield responses to rate of application alone were obtained in only three of 24 trials, with maximum yield occurring at 0.19-0.37 kg/ha a.i. and with some indication of a yield depression at 0.75 kg/ha a.i. A significant effect of time of application was observed in only two trials, but the results conflicted. In one trial there was a significant interaction between rate and time, with a response to rate of chlormequat only at the 6-leaf stage. No differences were detected between chlormequat formulations. In individual trials, the mean grain yield from the chlormequat treatments ranged from 92.9 to 116.5% of the control. However, averaging over all trials in each year, chlormequat treatments yielded 102.5, 99.3 and 100.0% of the control, respectively, in the three years. Our results confirm that low application rates of chlormequat, applied early in crop development, can increase grain yield. However, over the 24 trials, the effects of chlormequat were too small and inconsistent to warrant its use to increase wheat grain yields under natural rainfall in south-western Australia.
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Claims 12
Claim · model-written summary
Chlormequat application reduced wheat crop height in all trials.
- Taxon
- wheat
Triticum aestivumt0 - Treatment
- Chlormequat applicatione0
- Outcome
- crop heighte0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chlormequat application reduced crop height in all trials, but crop lodging did not occur in any trial”
t0“A re-evaluation of chlormequat application to wheat in Western Australia”
Claim · model-written summary
Crop lodging did not occur in any chlormequat trial.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- crop lodginge0
- Qualifier
- did not occur in any triale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chlormequat application reduced crop height in all trials, but crop lodging did not occur in any trial”
t0“A re-evaluation of chlormequat application to wheat in Western Australia”
Claim · model-written summary
Statistically significant grain yield responses to rate of application alone occurred in only three of 24 trials.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- Statistically significant yield responses to rate of application alonee1
- Qualifier
- in only three of 24 trialse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Statistically significant yield responses to rate of application alone were obtained in only three of 24 trials”
t0“A re-evaluation of chlormequat application to wheat in Western Australia”
Claim · model-written summary
Maximum grain yield occurred at 0.19-0.37 kg/ha a.i. of chlormequat.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- maximum yielde2
- Value
- 0.19-0.37 kg/ha a.ie2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“with maximum yield occurring at 0.19-0.37 kg/ha a.i”
t0“A re-evaluation of chlormequat application to wheat in Western Australia”
Claim · model-written summary
Some indication of yield depression occurred at 0.75 kg/ha a.i. of chlormequat.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- at 0.75 kg/ha a.i.e3
- Outcome
- yield depressione3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“with some indication of a yield depression at 0.75 kg/ha a.i.”
t0“A re-evaluation of chlormequat application to wheat in Western Australia”
Claim · model-written summary
A significant effect of time of application on grain yield was observed in only two trials, with conflicting results.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- time of applicatione4
- Outcome
- significant effect of time of applicatione4
- Qualifier
- in only two trialse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“A significant effect of time of application was observed in only two trials, but the results conflicted”
t0“A re-evaluation of chlormequat application to wheat in Western Australia”
Claim · model-written summary
In one trial, the response to chlormequat rate occurred only at the 6-leaf stage.
- Taxon
- wheatTriticum aestivumt0
- Organ / stage
- 6-leaf stagee5
- Outcome
- response to rate of chlormequate5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“In one trial there was a significant interaction between rate and time, with a response to rate of chlormequat only at the 6-leaf stage”
t0“A re-evaluation of chlormequat application to wheat in Western Australia”
Claim · model-written summary
No differences were detected between chlormequat formulations.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- chlormequat formulationse6
- Outcome
- No differences were detectede6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“No differences were detected between chlormequat formulations”
t0“A re-evaluation of chlormequat application to wheat in Western Australia”
Claim · model-written summary
Mean grain yield from chlormequat treatments ranged from 92.9 to 116.5% of the control across individual trials.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- the mean grain yield from the chlormequat treatmentse7
- Value
- 92.9 to 116.5%e7
- Qualifier
- In individual trialse7
- Comparator
- the controle7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“In individual trials, the mean grain yield from the chlormequat treatments ranged from 92.9 to 116.5% of the control”
t0“A re-evaluation of chlormequat application to wheat in Western Australia”
Claim · model-written summary
Averaged over all trials, chlormequat treatments yielded 102.5, 99.3 and 100.0% of the control in the three years.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- grain yielde2
- Value
- 102.5, 99.3 and 100.0%e1
- Qualifier
- respectively, in the three yearse1
- Comparator
- of the controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“chlormequat treatments yielded 102.5, 99.3 and 100.0% of the control, respectively, in the three years”
e2“The effect of chlormequat on the grain yield of wheat was investigated in 24 field experiments between 1981 and 1983”
t0“A re-evaluation of chlormequat application to wheat in Western Australia”
Claim · model-written summary
Low chlormequat application rates applied early in crop development can increase wheat grain yield.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- low application rates of chlormequat, applied early in crop developmente1
- Outcome
- grain yielde1
- Direction
- increasee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Our results confirm that low application rates of chlormequat, applied early in crop development, can increase grain yield”
t0“A re-evaluation of chlormequat application to wheat in Western Australia”
Claim · model-written summary
Chlormequat is not recommended for increasing wheat grain yield under natural rainfall in south-western Australia.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- its use to increase wheat grain yieldse1
- Qualifier
- too small and inconsistente1
- Setting
- south-western Australiae1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the effects of chlormequat were too small and inconsistent to warrant its use to increase wheat grain yields under natural rainfall in south-western Australia”
t0“A re-evaluation of chlormequat application to wheat in Western Australia”
The same questions in other papers
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See all 71 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.