Abstract
In the High Rainfall Zone (HRZ) irrigation and high rates of applied nitrogen fertiliser may increase therisk of lodging in winter wheat. Crop lodging can limit crop productivity through interfering with water andassimilate supply to the developing grain. Lodging can also interfere with harvest ranging from slowingharvest operation through to total crop loss when lodging is severe. Plant growth regulators (PGRs) mimicor alter production of plant hormones and thus regulate plant growth and development and are used as aninsurance measure against lodging. In some instances, PGRs have been reported to increase yield irrespectiveof whether lodging has occurred. Experiments were conducted on winter wheat cvs. Brennan and Revenueover four seasons (2009-2012) in northern Tasmania. Crops were treated with varying rates, combinationsand timings of chlormequat (CCC) and trinexapac-ethyl (TE). Experiments evaluated the individual andcombined effects of these two PGRs on height and grain yield. PGRs treatments reduced height in mostyears, for example in 2012 the combined treatment of CCC and TE applied at early stem elongation had thegreatest height reduction, decreasing plant height by 17% compared with the control. No lodging occurred inany year. PGRs increased yield in some years, for instance in 2012, CCC applied at mid tillering and earlystem elongation increased yield by 7.5 and 4.1% respectively compared with the control. The results indicatethat both TE and CCC alone and in combination can decrease lodging risk and in some seasons PGRs mayincrease yield.
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Claims 6
Claim · model-written summary
Chlormequat and trinexapac-ethyl treatments reduced plant height of winter wheat in most years.
- Taxon
- winter wheat
Triticum aestivumt0 - Treatment
- PGRse1
- Outcome
- heighte1
- Direction
- reducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“winter wheat in Tasmania”
e1“PGRs treatments reduced height in most years”
Claim · model-written summary
The combined CCC and TE treatment at early stem elongation gave the greatest height reduction of winter wheat in 2012, 17% below the control.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- combined treatment of CCC and TE applied at early stem elongatione2
- Outcome
- plant heighte2
- Direction
- decreasinge2
- Value
- 17%e2
- Comparator
- controle2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“winter wheat in Tasmania”
e2“in 2012 the combined treatment of CCC and TE applied at early stem elongation had the greatest height reduction, decreasing plant height by 17% compared with the control”
Claim · model-written summary
CCC applied at mid tillering increased winter wheat yield by 7.5% compared with the control in 2012.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- CCC applied at mid tilleringe3
- Outcome
- yielde3
- Direction
- increasede3
- Value
- 7.5e3
- Qualifier
- in 2012e3
- Comparator
- controle3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“winter wheat in Tasmania”
e3“in 2012, CCC applied at mid tillering and early stem elongation increased yield by 7.5 and 4.1% respectively compared with the control”
Claim · model-written summary
CCC applied at early stem elongation increased winter wheat yield by 4.1% compared with the control in 2012.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- CCCe3
- Outcome
- yielde3
- Direction
- increasede3
- Value
- 4.1%e3
- Qualifier
- early stem elongatione3
- Comparator
- controle3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“winter wheat in Tasmania”
e3“in 2012, CCC applied at mid tillering and early stem elongation increased yield by 7.5 and 4.1% respectively compared with the control”
Claim · model-written summary
No lodging occurred in winter wheat in any year of the trials.
- Taxon
- winter wheatTriticum aestivumt0
- Outcome
- lodginge4
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“winter wheat in Tasmania”
e4“No lodging occurred in any year”
Claim · model-written summary
TE and CCC alone and in combination can decrease lodging risk in winter wheat.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- TE and CCC alone and in combinatione5
- Outcome
- lodging riske5
- Direction
- decreasee5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“winter wheat in Tasmania”
e5“The results indicate that both TE and CCC alone and in combination can decrease lodging risk”
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