Abstract
The seed yield response of cocksfoot ( Dactylis glomerata L.) to stem‐shortening plant growth regulators (PGRs) chlormequat chloride (CCC) and trinexapac‐ethyl (TE) applied during stem elongation were evaluated in eight field trials in Canterbury; five irrigated and three non‐irrigated. Across all trials and treatments the average seed yield increase was 53% resulting in an extra 290 kg/ha. In irrigated trials, the average response to PGRs was 68%, resulting in an extra 380 kg/ha of seed, compared with an average 27% response in non‐irrigated trials. A mixture of CCC + TE (either 750 + 100 or 1500 + 200 g active ingredient [ai]/ha), applied at Zadoks growth stage (GS) 32 or split between GS 32 and GS 37–39, provided the largest and most consistent seed yield response of 86%, an extra 450 kg/ha. Reduced lodging was a factor in one trial only. In all trials, reduced stem length was associated with increased seed yield even in the absence of lodging. Seed yields increased at 12.5 kg/ha for every cm reduction in stem length from 130 cm (untreated) to 76 cm. This research provides evidence that the use of PGRs will improve seed yields of cocksfoot and the response is economic with a three‐ and sevenfold return on the cost of PGR and its application for dryland and irrigated crops, respectively.
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Claims 7
Claim · model-written summary
Across all trials, chlormequat chloride and trinexapac-ethyl increased cocksfoot seed yield by 53% on average.
- Taxon
- Dactylis glomerata
.jpg?width=60)
Dactylis glomeratat0 - Treatment
- chlormequat chloride (CCC) and trinexapac‐ethyl (TE)e0
- Outcome
- seed yielde1
- Direction
- increasee1
- Value
- 53%e1
- Setting
- field trials in Canterburye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
t0“cocksfoot ( Dactylis glomerata L.) cultivars”
e0“chlormequat chloride (CCC) and trinexapac‐ethyl (TE) applied during stem elongation were evaluated in eight field trials in Canterbury”
e1“Across all trials and treatments the average seed yield increase was 53% resulting in an extra 290 kg/ha”
Claim · model-written summary
In irrigated trials the average seed yield response to PGRs was 68%, higher than the 27% response in non-irrigated trials.
- Taxon
- Dactylis glomerataDactylis glomeratat0
- Treatment
- PGRse2
- Outcome
- average responsee2
- Direction
- higherinferrede2
- Value
- 68%e2
- Qualifier
- 27% responsee2
- Comparator
- non‐irrigated trialse2
- Setting
- irrigated trialse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cocksfoot ( Dactylis glomerata L.) cultivars”
e2“In irrigated trials, the average response to PGRs was 68%, resulting in an extra 380 kg/ha of seed, compared with an average 27% response in non‐irrigated trials”
Claim · model-written summary
The mixture of CCC and TE gave the largest and most consistent seed yield response, 86%.
- Taxon
- Dactylis glomerataDactylis glomeratat0
- Treatment
- A mixture of CCC + TEe3
- Outcome
- seed yield responsee3
- Direction
- largeste3
- Value
- 86%e3
- Qualifier
- most consistente3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cocksfoot ( Dactylis glomerata L.) cultivars”
e3“A mixture of CCC + TE (either 750 + 100 or 1500 + 200 g active ingredient [ai]/ha), applied at Zadoks growth stage (GS) 32 or split between GS 32 and GS 37–39, provided the largest and most consistent seed yield response of 86%, an extra 450 kg/ha”
Claim · model-written summary
Reduced stem length was associated with increased cocksfoot seed yield even without lodging.
- Taxon
- Dactylis glomerataDactylis glomeratat0
- Organ / stage
- steme4
- Outcome
- seed yielde4
- Direction
- increasede4
- Qualifier
- even in the absence of lodginge4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cocksfoot ( Dactylis glomerata L.) cultivars”
e4“In all trials, reduced stem length was associated with increased seed yield even in the absence of lodging”
Claim · model-written summary
Seed yield increased by 12.5 kg/ha for every cm reduction in stem length from 130 cm.
- Taxon
- Dactylis glomerataDactylis glomeratat0
- Treatment
- cm reduction in stem lengthe5
- Outcome
- Seed yieldse5
- Direction
- increasede5
- Value
- 12.5 kg/hae5
- Comparator
- 130 cme5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cocksfoot ( Dactylis glomerata L.) cultivars”
e5“Seed yields increased at 12.5 kg/ha for every cm reduction in stem length from 130 cm (untreated) to 76 cm”
Claim · model-written summary
Reduced lodging was observed in only one trial.
- Taxon
- Dactylis glomerataDactylis glomeratat0
- Outcome
- lodginge6
- Qualifier
- in one trial onlye6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cocksfoot ( Dactylis glomerata L.) cultivars”
e6“Reduced lodging was a factor in one trial only”
Claim · model-written summary
The PGR response was economic, with a three- and sevenfold return on the cost of PGR and its application.
- Taxon
- Dactylis glomerataDactylis glomeratat0
- Outcome
- return on the cost of PGR and its applicatione7
- Value
- three‐ and sevenfolde7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cocksfoot ( Dactylis glomerata L.) cultivars”
e7“a three‐ and sevenfold return on the cost of PGR and its application”
The same questions in other papers
trinexapac-ethyl · yield · Dactylis glomerata (cocksfoot)Positive and negative results
1 paper in the same direction as this paper · 1 reporting no difference from an alternative
- no effect
- positive
chlormequat chloride · yield · Dactylis glomerata (cocksfoot)Positive and negative results
1 paper in the same direction as this paper · 1 reporting no difference from an alternative
- no effect
- 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.