Abstract
Abstract Recent research suggests that there is considerable potential for exploiting genotypic differences in N utilization efficiency by crops. Our research attempted to identify traits associated with rice ( Oryza sativa L.) genotypes that support maximum grain production with a minimum input of fertilizer. From field experiments on an Andaqueptic Haplaquoll in three consecutive seasons we identified a group of plant parameters associated with efficiency of N utilization to determine if the different genotypes exhibited consistent and significant variations in these parameters. A group of nine parameters was selected, and rankings based upon different combinations of these parameters were developed and compared. Statistically significant differences among genotypes were observed, and reasonably consistent rankings were obtained from season to season. For example, IR183429‐3‐2‐1‐2 ranked first in two seasons and third in the other. IR18349‐135‐2‐3‐2‐1 ranked second, third, and fifth in the three seasons. These are medium maturity rices. IR42, which is known to perform well on low N soils, ranked between ninth and 17th. The consistency of performance of outstanding genotypes demonstrated in these experiments suggests that the methodology is feasible and practical for use in research on genetic improvement of N utilization efficiency.
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Claims 6
Claim · model-written summary
Genotypes differed significantly in the selected parameters.
- Taxon
- Rice
Oryza sativat0 - Outcome
- differences among genotypese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Statistically significant differences among genotypes were observed”
t0“Rice Genotypes”
Claim · model-written summary
Parameter based rankings were reasonably consistent across seasons.
- Taxon
- RiceOryza sativat0
- Outcome
- consistent rankingse0
- Comparator
- season to seasone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reasonably consistent rankings were obtained from season to season”
t0“Rice Genotypes”
Claim · model-written summary
IR183429‐3‐2‐1‐2 ranked first in two seasons and third in the other.
- Taxon
- RiceOryza sativat0
- Material
- IR183429‐3‐2‐1‐2e0
- Outcome
- ranked first in two seasons and third in the othere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“IR183429‐3‐2‐1‐2 ranked first in two seasons and third in the other”
t0“Rice Genotypes”
Claim · model-written summary
IR18349‐135‐2‐3‐2‐1 ranked second, third, and fifth across three seasons.
- Taxon
- RiceOryza sativat0
- Material
- IR18349‐135‐2‐3‐2‐1e0
- Outcome
- ranked second, third, and fifthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“IR18349‐135‐2‐3‐2‐1 ranked second, third, and fifth in the three seasons”
t0“Rice Genotypes”
Claim · model-written summary
IR42 ranked between ninth and 17th.
- Taxon
- RiceOryza sativat0
- Material
- IR42e0
- Outcome
- ranked between ninth and 17the0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“IR42, which is known to perform well on low N soils, ranked between ninth and 17th”
t0“Rice Genotypes”
Claim · model-written summary
The authors judged the ranking method feasible for nitrogen use efficiency improvement research.
- Taxon
- RiceOryza sativat0
- Outcome
- feasible and practicale0
- Comparator
- research on genetic improvement of N utilization efficiencye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the methodology is feasible and practical for use in research on genetic improvement of N utilization efficiency”
t0“Rice Genotypes”