Abstract
ABSTRACT The plant density at which maize ( Zea mays L.) hybrids achieve maximum grain yield has increased throughout the hybrid era while grain yield on a per plant basis has increased little. Changes in plant characteristics including flag leaf angle, anthesis‐silking interval, plant height, tassel branch number, and total number of leaves have been characterized in comparisons of commercial hybrids representing different eras of hybrid maize production but have not been studied extensively in a temperate maize recurrent selection program. The objective of this experiment was to determine if direct selection for grain yield and agronomic performance in the Iowa Stiff Stalk Synthetic (BSSS) population has indirectly improved adaptation to high plant density. Material from an unselected base population, BSSS per se, was compared to four selected populations per se at four plant densities ranging from 38,300, to 95,700 plants ha −1 . Treatments were replicated twice in each of two locations in 2 yr and arranged in a split plot design with plant density as whole plot and breeding population as subplot treatment. Selected populations had reduced anthesis‐silking interval and fewer tassel branches. Increasing plant density increased anthesis‐silking interval in the base population whereas increasing plant density did not increase anthesis‐silking interval in the most advanced populations. These results demonstrated that selected populations were better adapted to high plant density than the unselected base population.
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Claims 5
Claim · model-written summary
Selected maize populations had a shorter anthesis-silking interval than the unselected base.
- Treatment
- Selected populationse0
- Outcome
- anthesis‐silking intervale0
- Direction
- reducede0
- Comparator
- unselected base populatione1
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Selected populations had reduced anthesis‐silking interval and fewer tassel branches.”
t0“maize (Zea mays L.) Population”
e1“selected populations were better adapted to high plant density than the unselected base population.”
Claim · model-written summary
Selected maize populations had fewer tassel branches.
- Treatment
- Selected populationse0
- Outcome
- tassel branchese0
- Direction
- fewere0
- Comparator
- unselected base populatione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Selected populations had reduced anthesis‐silking interval and fewer tassel branches.”
t0“Maize (Zea mays L.) Population”
e1“selected populations were better adapted to high plant density than the unselected base population.”
Claim · model-written summary
Higher plant density increased anthesis-silking interval in the base population.
- Material
- base populatione0
- Treatment
- Increasing plant densitye0
- Outcome
- anthesis‐silking intervale0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing plant density increased anthesis‐silking interval in the base population”
t0“Maize (Zea mays L.) Population”
Claim · model-written summary
Higher density did not increase anthesis-silking interval in the most advanced populations.
- Material
- most advanced populationse0
- Treatment
- increasing plant densitye0
- Outcome
- anthesis‐silking intervale0
- Direction
- did not increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing plant density did not increase anthesis‐silking interval in the most advanced populations.”
t0“Maize (Zea mays L.) Population”
Claim · model-written summary
Selected populations were better adapted to high density than the unselected base.
- Material
- selected populationse0
- Outcome
- better adapted to high plant densitye0
- Comparator
- unselected base populatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“selected populations were better adapted to high plant density than the unselected base population.”
t0“Maize (Zea mays L.) Population”
The same questions in other papers
density · phenology · Zea mays (maize)Positive and negative results
2 papers in the same direction as this paper · 12 in the opposite direction
- negative
- negative
- negative
11 papers more in this group
See all 15 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.