Abstract
Tillage is declining in dryland wheat production systems. Our objectives were to determine if tillage × cultivar, seeding rate × cultivar, and tillage × seeding rate × cultivar interactions occurred for the yield components of hard red spring wheat ( Triticum aestivum L. emend. Thell.) in a wheat–fallow monoculture. The cultivars AC Minto, Amidon, Bergen, Grandin, and Norm were seeded at 123, 247, and 371 kernels m −2 in conventional‐till (CONT), reduced‐till (RT), and no‐till (NT) systems in a randomized complete block in a split‐split plot arrangement during 1995–1998. Tillage × cultivar and tillage × seeding rate × cultivar interactions did not occur for any yield component ( P > 0.05). A seeding rate × cultivar interaction occurred for both plant stand and tiller production, but the interaction resulted from a change in the magnitude of response and not in the ranking of cultivars to seeding rate adjustments for either yield component. Plant stand and the number of tillers per plant were unaffected by tillage systems, but the number of spike‐bearing tillers increased from 411 m −2 under CONT to 457 m −2 under NT. Tillage systems did not affect the number of kernels per spike or kernel weight. More spike‐bearing tillers per square meter occurred as the seeding rate increased, but there were fewer tillers per plant and a negative quadratic response in the number of kernels per spike. Results of this study indicate that the ranking of contrasting hard red spring wheat cultivars for yield components is unchanged by reductions in tillage in a wheat‐fallow monoculture.
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Claims 9
Claim · model-written summary
Number of spike-bearing tillers was higher under no-till than under conventional till
- Taxon
- wheat
Triticum aestivume0 - Treatment
- NTe1
- Outcome
- number of spike‐bearing tillerse1
- Direction
- increasede1
- Value
- 411 m −2 under CONT to 457 m −2 under NTe1
- Comparator
- CONTe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“hard red spring wheat ( Triticum aestivum L. emend. Thell.)”
e1“the number of spike‐bearing tillers increased from 411 m −2 under CONT to 457 m −2 under NT”
Claim · model-written summary
Plant stand and tillers per plant were unaffected by tillage systems
- Taxon
- wheatTriticum aestivume0
- Treatment
- tillage systemse2
- Outcome
- Plant stand and the number of tillers per plante2
- Direction
- unaffectede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“hard red spring wheat ( Triticum aestivum L. emend. Thell.)”
e2“Plant stand and the number of tillers per plant were unaffected by tillage systems”
Claim · model-written summary
Tillage systems did not affect kernels per spike or kernel weight of wheat
- Taxon
- wheatTriticum aestivume0
- Treatment
- Tillage systemse3
- Outcome
- number of kernels per spike or kernel weighte3
- Direction
- did not affecte3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“hard red spring wheat ( Triticum aestivum L. emend. Thell.)”
e3“Tillage systems did not affect the number of kernels per spike or kernel weight”
Claim · model-written summary
More tillers per square metre occurred as seeding rate increased in wheat
- Taxon
- wheatTriticum aestivume0
- Treatment
- seeding ratee4
- Outcome
- tillers per square metere4
- Direction
- Moree4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“hard red spring wheat ( Triticum aestivum L. emend. Thell.)”
e4“More spike‐bearing tillers per square meter occurred as the seeding rate increased”
Claim · model-written summary
Wheat had fewer tillers per plant at higher seeding rate
- Taxon
- wheatTriticum aestivume0
- Treatment
- seeding ratee5
- Outcome
- tillers per plante5
- Direction
- fewere5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“hard red spring wheat ( Triticum aestivum L. emend. Thell.)”
e5“More spike‐bearing tillers per square meter occurred as the seeding rate increased, but there were fewer tillers per plant and a negative quadratic response in the number of kernels per spike”
Claim · model-written summary
Kernels per spike showed a negative quadratic response to seeding rate in wheat
- Taxon
- wheatTriticum aestivume0
- Treatment
- seeding ratee5
- Outcome
- number of kernels per spikee5
- Direction
- negativee5
- Qualifier
- quadratic responsee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“hard red spring wheat ( Triticum aestivum L. emend. Thell.)”
e5“More spike‐bearing tillers per square meter occurred as the seeding rate increased, but there were fewer tillers per plant and a negative quadratic response in the number of kernels per spike”
Claim · model-written summary
A seeding rate by cultivar interaction occurred for plant stand and tiller production of wheat
- Taxon
- wheatTriticum aestivume0
- Treatment
- seeding ratee6
- Outcome
- plant stand and tiller productione6
- Direction
- occurrede6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“hard red spring wheat ( Triticum aestivum L. emend. Thell.)”
e6“A seeding rate × cultivar interaction occurred for both plant stand and tiller production”
Claim · model-written summary
Tillage did not interact with cultivar or seeding rate for any wheat yield component
- Taxon
- wheatTriticum aestivume0
- Treatment
- Tillagee7
- Outcome
- yield componente7
- Direction
- did not occure7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“hard red spring wheat ( Triticum aestivum L. emend. Thell.)”
e7“Tillage × cultivar and tillage × seeding rate × cultivar interactions did not occur for any yield component”
Claim · model-written summary
Ranking of contrasting hard red spring wheat cultivars for yield components was unchanged by reduced tillage
- Taxon
- hard red spring wheate6
- Treatment
- reductions in tillagee6
- Outcome
- ranking of contrasting hard red spring wheat cultivars for yield componentse6
- Direction
- unchangede6
Not reportedComparator
Verbatim
e6“Results of this study indicate that the ranking of contrasting hard red spring wheat cultivars for yield components is unchanged by reductions in tillage in a wheat‐fallow monoculture”
The same questions in other papers
tillage · yield · Triticum aestivum (wheat)Positive and negative results
1,115 papers in the same direction as this paper · 257 in the opposite direction · 41 reporting no difference from an alternative
- no effect
- negative
- no effect
1,410 papers more in this group
See all 1,414 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.