Abstract
In general, lodging has been controlled by restricting nitrogen fertilizer application and/or using short cultivars. Growth retardants can also be used to solve this problem.The objective of this study was to evaluate the effect of rates and application times of three growth retardants on Pioneiro wheat cultivar. The trial was carried out in Viçosa-MG, from May to September 2005, in a factorial and hierarchical scheme, in a randomized block design with four replications and a control treatment. The treatments consisted of 500, 1,000 and 1,500 g ha-1 of chlormequat; 62.5, 125 and 187.5 g ha-1 of trinexapac-ethyl and 40, 80 and 120 g ha-1 of paclobutrazol applied at growth stages 6 or 8, growth stage used on the scale of Feeks and Large, and a control treatment without growth retardant application. Only trinexapac-ethyl and chlormequat were efficient in reducing plant height; the effect of chlormequat and paclobutrazol on plant height was independent of the application time, but the trinexapac-ethyl at growth stage 8 produced shorter plant height than at stage 6. Increasing growth retardant rates produced shorter plant heights; chlormequat and paclobutrazol did not affect grain yield. However, the highest trinexapac-ethyl rates reduced wheat yield.
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Claims 6
Claim · model-written summary
Only trinexapac-ethyl and chlormequat reduced wheat plant height, relative to the control without retardant.
- Taxon
- wheat
Triticum aestivumt0 - Treatment
- trinexapac-ethyl and chlormequate1
- Outcome
- plant heighte1
- Direction
- reducinge1
- Comparator
- control treatment without growth retardant applicatione2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Use of growth retardants in wheat”
e1“Only trinexapac-ethyl and chlormequat were efficient in reducing plant height”
e2“a control treatment without growth retardant application”
Claim · model-written summary
The effect of chlormequat and paclobutrazol on wheat plant height was independent of application time.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- chlormequat and paclobutrazole3
- Outcome
- plant heighte3
- Direction
- independente3
- Comparator
- application timee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Use of growth retardants in wheat”
e3“the effect of chlormequat and paclobutrazol on plant height was independent of the application time”
Claim · model-written summary
Trinexapac-ethyl applied at growth stage 8 gave shorter wheat plants than at stage 6.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- trinexapac-ethyl at growth stage 8e4
- Outcome
- plant heighte4
- Direction
- shortere4
- Comparator
- stage 6e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Use of growth retardants in wheat”
e4“the trinexapac-ethyl at growth stage 8 produced shorter plant height than at stage 6”
Claim · model-written summary
Increasing growth retardant rates produced shorter wheat plants.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- growth retardant ratese5
- Outcome
- plant heightse5
- Direction
- shortere5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Use of growth retardants in wheat”
e5“Increasing growth retardant rates produced shorter plant heights”
Claim · model-written summary
Chlormequat and paclobutrazol did not affect wheat grain yield.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- chlormequat and paclobutrazole6
- Outcome
- grain yielde6
- Direction
- did not affecte6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Use of growth retardants in wheat”
e6“chlormequat and paclobutrazol did not affect grain yield”
Claim · model-written summary
The highest trinexapac-ethyl rates reduced wheat yield.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- highest trinexapac-ethyl ratese7
- Outcome
- wheat yielde7
- Direction
- reducede7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Use of growth retardants in wheat”
e7“the highest trinexapac-ethyl rates reduced wheat yield”
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