Abstract
Lodging is a common concern in wheat production, and its intensity depends on many factors including the straw strength of the variety, nitrogen (N) levels, and plant growth regulator (PGR). However, there are limited data exploring how current Kansas wheat varieties respond to PGR applications at different fertility levels. Thus, our objective was to assess the effects of PGR on wheat varieties exposed to different levels of N fertilization. A field trial was established in a split-split-plot design and four replications in two Kansas locations (Great Bend and Ashland Bottoms) during the 2017–18 growing season. Factors evaluated were two N levels as whole plots (e.g., for a yield goal of 55 versus 73 bu/a), two varieties as sub-plot (below average straw strength with 1863 and above average straw strength with WB-Grainfield), and PGR (control versus 14.4 fl oz/a of Palisade applied at jointing). Due to an extremely dry growing season, biomass production was decreased and no lodging was observed. Still, the application of PGR decreased plant height at both locations by 0.6–1 inch, although this decrease depended on fertility level at the Great Bend site. WB-Grainfield was typically taller than 1863, regardless of location evaluated. Despite its effect of reducing plant height, grain yield was unaffected by PGR application. In Great Bend, grain yield was only affected by variety; while an interaction of variety × fertility affected grain yield in Ashland Bottoms. These results are promising as there was no yield drag from PGR applications despite an extremely dry growing season.
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Claims 7
Claim · model-written summary
Palisade applied at jointing decreased wheat plant height by 0.6–1 inch relative to control at both locations.
- Taxon
- wheat
Triticum aestivume0 - Treatment
- 14.4 fl oz/a of Palisade applied at jointinge2
- Outcome
- plant heighte1
- Direction
- decreasede1
- Value
- 0.6–1 inche1
- Qualifier
- depended on fertility level at the Great Bend sitee4
- Comparator
- controle2
- Setting
- two Kansas locations (Great Bend and Ashland Bottoms)e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“assess the effects of PGR on wheat varieties exposed to different levels of N fertilization”
e1“the application of PGR decreased plant height at both locations by 0.6–1 inch”
e2“PGR (control versus 14.4 fl oz/a of Palisade applied at jointing)”
e3“in two Kansas locations (Great Bend and Ashland Bottoms) during the 2017–18 growing season”
e4“although this decrease depended on fertility level at the Great Bend site”
Claim · model-written summary
PGR application did not change wheat grain yield.
- Taxon
- wheatTriticum aestivume0
- Treatment
- PGR applicatione5
- Outcome
- grain yielde5
- Direction
- unaffectede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“assess the effects of PGR on wheat varieties exposed to different levels of N fertilization”
e5“Despite its effect of reducing plant height, grain yield was unaffected by PGR application”
Claim · model-written summary
In Great Bend, wheat grain yield was affected only by variety.
- Taxon
- wheatTriticum aestivume0
- Treatment
- varietye6
- Outcome
- grain yielde6
- Setting
- Great Bende6
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“assess the effects of PGR on wheat varieties exposed to different levels of N fertilization”
e6“In Great Bend, grain yield was only affected by variety”
Claim · model-written summary
In Ashland Bottoms, an interaction of variety and fertility affected wheat grain yield.
- Taxon
- wheatTriticum aestivume0
- Treatment
- variety × fertilitye7
- Outcome
- grain yielde7
- Setting
- Ashland Bottomse7
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“assess the effects of PGR on wheat varieties exposed to different levels of N fertilization”
e7“while an interaction of variety × fertility affected grain yield in Ashland Bottoms”
Claim · model-written summary
WB-Grainfield was typically taller than 1863, regardless of location.
- Taxon
- wheatTriticum aestivume0
- Material
- WB-Grainfielde6
- Outcome
- plant heighte1
- Direction
- tallere6
- Comparator
- 1863e6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“assess the effects of PGR on wheat varieties exposed to different levels of N fertilization”
e1“the application of PGR decreased plant height at both locations by 0.6–1 inch”
e6“WB-Grainfield was typically taller than 1863, regardless of location evaluated”
Claim · model-written summary
No lodging was observed in the trial.
- Taxon
- wheatTriticum aestivume0
- Outcome
- lodginge6
- Qualifier
- Due to an extremely dry growing seasone6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“assess the effects of PGR on wheat varieties exposed to different levels of N fertilization”
e6“Due to an extremely dry growing season, biomass production was decreased and no lodging was observed”
Claim · model-written summary
Biomass production decreased in the extremely dry growing season.
- Taxon
- wheatTriticum aestivume0
- Outcome
- biomass productione6
- Direction
- decreasede6
- Qualifier
- Due to an extremely dry growing seasone6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“assess the effects of PGR on wheat varieties exposed to different levels of N fertilization”
e6“Due to an extremely dry growing season, biomass production was decreased and no lodging was observed”
The same questions in other papers
class · yield · Triticum aestivum (wheat)Positive and negative results
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See all 117 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.