Abstract
Selection was conducted to develop single‐cross hybrids of maize ( Zea mays L.) with high grain yield, high levels of prolificacy, and high values for the components of N‐use efficiency. Hybrid and S 1 progenies were developed from reciprocal crosses and self‐pollinations of paired plants of the improved ‘Jarvis’ and ‘Indian Chief’ populations, JR10 and IRI0. Selection among hybrid S 0 ✕ S 0 progenies for high yield at high N and selection for two ears per plant in the parental lines was effective in increasing the number of ears per plant and N uptake, but it resulted in no increase in yield over the population hybrid, JR10 ✕ IR10. Subsequently, selection carried out among remaining hybrid S 1 ✕ S 1 progenies for five criteria (N‐use efficiency averaged over two levels of N supply, three components of N‐use efficiency, and ears per plant) was effective in improving yield at high N supply as well as N‐use efficiency, N‐uptake efficiency, and efficiency of utilization of accumulated N. Nitrogen‐use efficiency averaged over levels of N supply was the most effective selection criterion. In the selected prolific hybrids, both major components of yield (ears per plant and weight per ear) were highly correlated with grain yield. Of the six superior hybrids, five showed significant positive correlations between ears per plant and weight per ear.
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Claims 7
Claim · model-written summary
Selection among hybrid S0 x S0 progenies for high yield at high N and for two ears per plant in the parental lines increased the number of ears per plant and N uptake in maize.
- Treatment
- Selection among hybrid S 0 ✕ S 0 progenies for high yield at high Ne1
- Outcome
- number of ears per plant and N uptakee1
- Direction
- increasinge1
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“hybrids of maize ( Zea mays L.)”
e1“Selection among hybrid S 0 ✕ S 0 progenies for high yield at high N and selection for two ears per plant in the parental lines was effective in increasing the number of ears per plant and N uptake”
Claim · model-written summary
The same selection did not increase yield over the population hybrid JR10 x IR10.
- Treatment
- Selection among hybrid S 0 ✕ S 0 progenies for high yield at high Ne1
- Outcome
- yielde1
- Direction
- no increasee1
- Comparator
- the population hybride1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“hybrids of maize ( Zea mays L.)”
e1“Selection among hybrid S 0 ✕ S 0 progenies for high yield at high N and selection for two ears per plant in the parental lines was effective in increasing the number of ears per plant and N uptake, but it resulted in no increase in yield over the population hybrid”
Claim · model-written summary
Subsequent selection among hybrid S1 x S1 progenies for five criteria improved yield at high N supply.
- Treatment
- selection carried out among remaining hybrid S 1 ✕ S 1 progenies for five criteriae1
- Outcome
- yield at high N supplye1
- Direction
- improvinge1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“hybrids of maize ( Zea mays L.)”
e1“selection carried out among remaining hybrid S 1 ✕ S 1 progenies for five criteria (N‐use efficiency averaged over two levels of N supply, three components of N‐use efficiency, and ears per plant) was effective in improving yield at high N supply as well as N‐use efficiency, N‐uptake efficiency, and efficiency of utilization of accumulated N”
Claim · model-written summary
Subsequent selection among hybrid S1 x S1 progenies for five criteria improved N-use efficiency, N-uptake efficiency and efficiency of utilization of accumulated N.
- Treatment
- selection carried out among remaining hybrid S 1 ✕ S 1 progenies for five criteriae1
- Outcome
- N‐use efficiency, N‐uptake efficiency, and efficiency of utilization of accumulated Ne1
- Direction
- improvinge1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“hybrids of maize ( Zea mays L.)”
e1“selection carried out among remaining hybrid S 1 ✕ S 1 progenies for five criteria (N‐use efficiency averaged over two levels of N supply, three components of N‐use efficiency, and ears per plant) was effective in improving yield at high N supply as well as N‐use efficiency, N‐uptake efficiency, and efficiency of utilization of accumulated N”
Claim · model-written summary
N-use efficiency averaged over levels of N supply was the most effective selection criterion.
- Outcome
- most effective selection criterione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“hybrids of maize ( Zea mays L.)”
e1“Nitrogen‐use efficiency averaged over levels of N supply was the most effective selection criterion”
Claim · model-written summary
In the selected prolific hybrids, both ears per plant and weight per ear were highly correlated with grain yield.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“hybrids of maize ( Zea mays L.)”
e1“In the selected prolific hybrids, both major components of yield (ears per plant and weight per ear) were highly correlated with grain yield”
Claim · model-written summary
Of the six superior hybrids, five showed significant positive correlations between ears per plant and weight per ear.
- Material
- six superior hybridse1
- Outcome
- weight per eare1
- Direction
- positivee1
- Value
- fivee1
- Qualifier
- ears per plante1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“hybrids of maize ( Zea mays L.)”
e1“Of the six superior hybrids, five showed significant positive correlations between ears per plant and weight per ear”
The same questions in other papers
nitrogen · yield · Zea mays (maize)Positive and negative results
1,905 papers in the same direction as this paper · 234 in the opposite direction · 45 reporting no difference from an alternative
- negative
- positive
- positive
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See all 2,185 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.