Abstract
Abstract Research on growth responses of corn ( Zea mays L.) to environmental conditions associated with conservation‐tillage systems has not been extensively conducted. Therefore, the objectives of this study were to evaluate effects of various tillage systems (fall moldboard plow, till‐plant, no‐till ridge with and without previous‐crop residue) and early planting on growth and productivity of several corn genotypes (including two heterogeneous breeding populations that were improved for cold tolerance by recurrent selection). The experiment was conducted for 2 years on a loam soil (Typic Hapludoll), and planting dates were 1 Apr. 1974, and 30 Apr. 1975. Conservation‐tillage systems were associated with lower midafternoon soil temperatures (at 5‐cm depth) during the early growing season and more variability in depth of seed placement. Also, seedling and juvenile plant growth, final plant densities, and grain yields were lower in conservation‐tillage systems. These differences were accentuated in the early planting environment of the 1974 experiment. With a relatively normal planting date and equal final plant densities (the not affected by tillage treatment. There was no interaction between tillage method and com genotype. Usually, genotypes with vigorous seedling and juvenile plant growth and high final plant stands produced highest grain yields in all tillage environments. In the central U.S. Corn Belt, therefore, optimum corn grain yields in conservation‐tillage environments will be obtained by the use of planters that assure uniform seed depth and genotypes that display vigorous plant growth and development.
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Claims 7
Claim · model-written summary
Conservation-tillage systems were associated with lower midafternoon soil temperatures at 5-cm depth during the early growing season in the corn experiment.
- Taxon
- Corn
Zea mays subsp. mayst0 - Treatment
- Conservation‐tillage systemse0
- Outcome
- midafternoon soil temperaturese0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Productivity of Corn1”
e0“Conservation‐tillage systems were associated with lower midafternoon soil temperatures (at 5‐cm depth) during the early growing season and more variability in depth of seed placement”
Claim · model-written summary
Conservation-tillage systems were associated with more variability in depth of seed placement in corn.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- Conservation‐tillage systemse0
- Outcome
- variability in depth of seed placemente0
- Direction
- moree0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Productivity of Corn1”
e0“Conservation‐tillage systems were associated with lower midafternoon soil temperatures (at 5‐cm depth) during the early growing season and more variability in depth of seed placement”
Claim · model-written summary
Seedling and juvenile plant growth, final plant densities and grain yields of corn were lower in conservation-tillage systems.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- conservation‐tillage systemse0
- Outcome
- seedling and juvenile plant growth, final plant densities, and grain yieldse0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Productivity of Corn1”
e0“Also, seedling and juvenile plant growth, final plant densities, and grain yields were lower in conservation‐tillage systems”
Claim · model-written summary
The reductions in corn under conservation tillage were accentuated in the early planting environment of the 1974 experiment.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- early plantinge0
- Outcome
- differencese0
- Direction
- accentuatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Productivity of Corn1”
e0“These differences were accentuated in the early planting environment of the 1974 experiment”
Claim · model-written summary
No interaction was found between tillage method and corn genotype.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- tillage methode0
- Outcome
- interaction between tillage method and com genotypee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Productivity of Corn1”
e0“There was no interaction between tillage method and com genotype”
Claim · model-written summary
Corn genotypes with vigorous seedling and juvenile plant growth and high final plant stands produced the highest grain yields in all tillage environments.
- Taxon
- CornZea mays subsp. mayst0
- Material
- genotypes with vigorous seedling and juvenile plant growth and high final plant standse0
- Outcome
- highest grain yieldse0
- Direction
- higheste0
- Setting
- all tillage environmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Productivity of Corn1”
e0“genotypes with vigorous seedling and juvenile plant growth and high final plant stands produced highest grain yields in all tillage environments”
Claim · model-written summary
For optimum corn grain yields in conservation-tillage environments in the central U.S. Corn Belt, use planters that assure uniform seed depth and genotypes with vigorous plant growth.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- planters that assure uniform seed depth and genotypes that display vigorous plant growth and developmente0
- Outcome
- optimum corn grain yieldse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“optimum corn grain yields in conservation‐tillage environments will be obtained by the use of planters that assure uniform seed depth and genotypes that display vigorous plant growth and development”
The same questions in other papers
tillage · pest · Zea mays (maize)Positive and negative results
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See all 49 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.