Abstract
Optimum use of the limited growing period for maize ( Zea mays L.) in short season areas is essential to maximize grain yield. The objective of this study was to evaluate the effects of vegetative phase duration (VPD), i.e., time from planting to silk emergence, and actual filling period duration (AFPD) on grain yield and its components in short season maize germplasm. Eleven random mating populations were subjected to divergent selection to form four subpopulations in each that varied in VPD and AFPD, both measured on an Ontario Corn Heat Units (CHU) basis. The material was evaluated in three environments in Ontario, viz., Innerkip 1981, Woodstock 1982, and Ridgetown 1982. Soil type at each location was a Burford silt loam (Typic Hapludalf). The direct effects of selection, and the correlated responses of other agronomic traits, including grain yield, were significant for most traits. For example, at Ridgetown 1982 average differences between the two extreme subpopulation groups were 200 CHU for VPD, 57 CHU for AFPD, 46 g kg −1 for grain moisture at harvest, and 2.0 Mg ha −1 for grain yield. The joint effect of varying VPD and AFPD on grain yield and components, i.e., kernel number per plant and 1000 kernel mass, was assessed by fitting quadratic response surface models. Increased VPD had positive, significant effects on grain yield; increased AFPD had slight positive effects but these were generally not significant. Differences in kernel number per plant contributed most to grain yield variation within any environment, whereas 1000 kernel mass contributed most to grain yield differences across environments. These results indicate a vegetative size limitation for grain yield of short season maize in the material studied. This should not be interpreted strictly as a source (supply of photoassimilate) limitation during the grain filling period, because preanthesis source size may partly determine kernel number per plant and thus affect sink size.
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Claims 10
Claim · model-written summary
Direct effects of selection and correlated responses of other agronomic traits, including grain yield, were significant for most traits.
Zea maysNot reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Optimum use of the limited growing period for maize ( Zea mays L.) in short season areas is essential to maximize grain yield”
e3“The direct effects of selection, and the correlated responses of other agronomic traits, including grain yield, were significant for most traits”
Claim · model-written summary
Between the two extreme subpopulation groups, VPD differed by 200 CHU at Ridgetown 1982.
- Treatment
- divergent selectione1
- Outcome
- VPDe2
- Value
- 200 CHUe2
- Comparator
- the two extreme subpopulation groupse2
- Setting
- Ridgetown 1982e2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Optimum use of the limited growing period for maize ( Zea mays L.) in short season areas is essential to maximize grain yield”
e1“Eleven random mating populations were subjected to divergent selection to form four subpopulations in each that varied in VPD and AFPD”
e2“at Ridgetown 1982 average differences between the two extreme subpopulation groups were 200 CHU for VPD, 57 CHU for AFPD, 46 g kg −1 for grain moisture at harvest, and 2.0 Mg ha −1 for grain yield”
Claim · model-written summary
Between the two extreme subpopulation groups, AFPD differed by 57 CHU at Ridgetown 1982.
- Treatment
- divergent selectione1
- Outcome
- AFPDe2
- Value
- 57 CHUe2
- Comparator
- the two extreme subpopulation groupse2
- Setting
- Ridgetown 1982e2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Optimum use of the limited growing period for maize ( Zea mays L.) in short season areas is essential to maximize grain yield”
e1“Eleven random mating populations were subjected to divergent selection to form four subpopulations in each that varied in VPD and AFPD”
e2“at Ridgetown 1982 average differences between the two extreme subpopulation groups were 200 CHU for VPD, 57 CHU for AFPD, 46 g kg −1 for grain moisture at harvest, and 2.0 Mg ha −1 for grain yield”
Claim · model-written summary
Between the two extreme subpopulation groups, grain moisture at harvest differed by 46 g kg −1 at Ridgetown 1982.
- Treatment
- divergent selectione1
- Outcome
- grain moisture at harveste2
- Value
- 46 g kg −1e2
- Comparator
- the two extreme subpopulation groupse2
- Setting
- Ridgetown 1982e2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Optimum use of the limited growing period for maize ( Zea mays L.) in short season areas is essential to maximize grain yield”
e1“Eleven random mating populations were subjected to divergent selection to form four subpopulations in each that varied in VPD and AFPD”
e2“at Ridgetown 1982 average differences between the two extreme subpopulation groups were 200 CHU for VPD, 57 CHU for AFPD, 46 g kg −1 for grain moisture at harvest, and 2.0 Mg ha −1 for grain yield”
Claim · model-written summary
Between the two extreme subpopulation groups, grain yield differed by 2.0 Mg ha −1 at Ridgetown 1982.
- Treatment
- divergent selectione1
- Outcome
- grain yielde2
- Value
- 2.0 Mg ha −1e2
- Comparator
- the two extreme subpopulation groupse2
- Setting
- Ridgetown 1982e2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Optimum use of the limited growing period for maize ( Zea mays L.) in short season areas is essential to maximize grain yield”
e1“Eleven random mating populations were subjected to divergent selection to form four subpopulations in each that varied in VPD and AFPD”
e2“at Ridgetown 1982 average differences between the two extreme subpopulation groups were 200 CHU for VPD, 57 CHU for AFPD, 46 g kg −1 for grain moisture at harvest, and 2.0 Mg ha −1 for grain yield”
Claim · model-written summary
Increased VPD had positive, significant effects on grain yield.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Optimum use of the limited growing period for maize ( Zea mays L.) in short season areas is essential to maximize grain yield”
e3“Increased VPD had positive, significant effects on grain yield; increased AFPD had slight positive effects but these were generally not significant”
Claim · model-written summary
Increased AFPD had slight positive effects on grain yield that were generally not significant.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Optimum use of the limited growing period for maize ( Zea mays L.) in short season areas is essential to maximize grain yield”
e3“Increased VPD had positive, significant effects on grain yield; increased AFPD had slight positive effects but these were generally not significant”
Claim · model-written summary
Differences in kernel number per plant contributed most to grain yield variation within any environment.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Optimum use of the limited growing period for maize ( Zea mays L.) in short season areas is essential to maximize grain yield”
e4“Differences in kernel number per plant contributed most to grain yield variation within any environment, whereas 1000 kernel mass contributed most to grain yield differences across environments”
Claim · model-written summary
1000 kernel mass contributed most to grain yield differences across environments.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Optimum use of the limited growing period for maize ( Zea mays L.) in short season areas is essential to maximize grain yield”
e4“Differences in kernel number per plant contributed most to grain yield variation within any environment, whereas 1000 kernel mass contributed most to grain yield differences across environments”
Claim · model-written summary
The results indicate a vegetative size limitation for grain yield of short-season maize in the material studied (author interpretation).
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Optimum use of the limited growing period for maize ( Zea mays L.) in short season areas is essential to maximize grain yield”
e5“These results indicate a vegetative size limitation for grain yield of short season maize in the material studied”
The same questions in other papers
humidity · yield · Zea mays (maize)Positive and negative results
3 papers in the same direction as this paper · 3 in the opposite direction
- no effect
- negative
- negative
3 papers more in this group
See all 7 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.