Abstract
The development of low-nitrogen (N) tolerant varieties is an effective way to improve the use efficiency of N in rice and is crucial to the sustainable rice production in China. Recently, we observed that higher grain yields were obtained in the hybrid rice variety Deyou 4727 (DY4727) than in the hybrid rice variety Y-liangyou 900 (YLY900) under zero-N fertilization conditions, suggesting that DY4727 has higher low-N tolerance compared to YLY900. In this study, field experiments were performed in 2020 and 2021 to compare the responses of yield attributes to N fertilization (180 kg N ha–1) relativized to zero-N fertilization between DY4727 and YLY900. Results showed that the response of grain yield to N fertilization was 13–55% for two varieties in two years. DY4727 had lower response of grain yield to N fertilization than YLY900 by 47% in 2020 and by 70% in 2021. There were no significant or consistent differences in responses of spikelets per m2, spikelet filling percentage, aboveground biomass, intercepted radiation, radiation use efficiency, and aboveground N uptake to N fertilization between DY4727 and YLY900. DY4727 had 32% and 26% lower positive response of grain weight to N fertilization compared to YLY900 in 2020 and 2021, respectively. The response of harvest index to N fertilization was negative (−3% in 2020 and −9% in 2021) for DY4727 but positive (1% in 2020 and 12% in 2021) for YLY900. DY4727 had higher negative response of internal N-use efficiency to N fertilization (−41% in 2020 and −24% in 2021) than YLY900 (−11% in 2020 and −10% in 2021). This study suggests that grain weight, harvest index, and internal N-use efficiency are key traits determining the difference in response of grain yield to N fertilization between DY4727 and YLY900.
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Claims 14
Claim · model-written summary
Grain yield response to nitrogen was 13–55% across varieties and years.
- Taxon
- Rice
Oryza sativat0 - Treatment
- N fertilizatione0
- Outcome
- grain yielde0
- Direction
- increaseinferrede0
- Value
- 13–55%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the response of grain yield to N fertilization was 13–55% for two varieties in two years.”
t0“Rice”
Claim · model-written summary
DY4727 yield response was 47% lower than YLY900 in 2020.
- Taxon
- RiceOryza sativat0
- Material
- DY4727e0
- Outcome
- response of grain yield to N fertilizatione0
- Direction
- lowere0
- Value
- 47%e0
- Qualifier
- 2020e0
- Comparator
- YLY900e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“DY4727 had lower response of grain yield to N fertilization than YLY900 by 47% in 2020”
t0“Rice”
Claim · model-written summary
DY4727 yield response was 70% lower than YLY900 in 2021.
- Taxon
- RiceOryza sativat0
- Material
- DY4727e0
- Outcome
- response of grain yield to N fertilizatione0
- Direction
- lowere0
- Value
- 70%e0
- Qualifier
- 2021e0
- Comparator
- YLY900e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“DY4727 had lower response of grain yield to N fertilization than YLY900 by 47% in 2020 and by 70% in 2021.”
t0“Rice”
Claim · model-written summary
Responses of six measured traits did not differ significantly or consistently between varieties.
- Taxon
- RiceOryza sativat0
- Material
- DY4727e0
- Outcome
- spikelets per m2, spikelet filling percentage, aboveground biomasse0
- Direction
- no significant or consistent differencese0
- Comparator
- YLY900e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were no significant or consistent differences in responses of spikelets per m2, spikelet filling percentage, aboveground biomass, intercepted radiation, radiation use efficiency, and aboveground N uptake to N fertilization between DY4727 and YLY900.”
t0“Rice”
Claim · model-written summary
DY4727 grain weight response was 32% lower than YLY900 in 2020.
- Taxon
- RiceOryza sativat0
- Material
- DY4727e0
- Outcome
- response of grain weight to N fertilizatione0
- Direction
- lowere0
- Value
- 32%e0
- Qualifier
- 2020e0
- Comparator
- YLY900e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“DY4727 had 32% and 26% lower positive response of grain weight to N fertilization compared to YLY900 in 2020 and 2021, respectively.”
t0“Rice”
Claim · model-written summary
DY4727 grain weight response was 26% lower than YLY900 in 2021.
- Taxon
- RiceOryza sativat0
- Material
- DY4727e0
- Outcome
- response of grain weight to N fertilizatione0
- Direction
- lowere0
- Value
- 26%e0
- Qualifier
- 2021e0
- Comparator
- YLY900e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“DY4727 had 32% and 26% lower positive response of grain weight to N fertilization compared to YLY900 in 2020 and 2021, respectively.”
t0“Rice”
Claim · model-written summary
DY4727 harvest index response was negative in 2020.
- Taxon
- RiceOryza sativat0
- Material
- DY4727e0
- Treatment
- N fertilizatione0
- Outcome
- harvest indexe0
- Direction
- negativee0
- Value
- −3%e0
- Qualifier
- 2020e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The response of harvest index to N fertilization was negative (−3% in 2020 and −9% in 2021) for DY4727”
t0“Rice”
Claim · model-written summary
DY4727 harvest index response was negative in 2021.
- Taxon
- RiceOryza sativat0
- Material
- DY4727e0
- Treatment
- N fertilizatione0
- Outcome
- harvest indexe0
- Direction
- negativee0
- Value
- −9%e0
- Qualifier
- 2021e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The response of harvest index to N fertilization was negative (−3% in 2020 and −9% in 2021) for DY4727”
t0“Rice”
Claim · model-written summary
YLY900 harvest index response was positive in 2020.
- Taxon
- RiceOryza sativat0
- Material
- YLY900e0
- Treatment
- N fertilizatione0
- Outcome
- harvest indexe0
- Direction
- positivee0
- Value
- 1%e0
- Qualifier
- 2020e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The response of harvest index to N fertilization was negative (−3% in 2020 and −9% in 2021) for DY4727 but positive (1% in 2020 and 12% in 2021) for YLY900.”
t0“Rice”
Claim · model-written summary
YLY900 harvest index response was positive in 2021.
- Taxon
- RiceOryza sativat0
- Material
- YLY900e0
- Treatment
- N fertilizatione0
- Outcome
- harvest indexe0
- Direction
- positivee0
- Value
- 12%e0
- Qualifier
- 2021e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The response of harvest index to N fertilization was negative (−3% in 2020 and −9% in 2021) for DY4727 but positive (1% in 2020 and 12% in 2021) for YLY900.”
t0“Rice”
Claim · model-written summary
DY4727 internal nitrogen use efficiency declined 41% in 2020.
- Taxon
- RiceOryza sativat0
- Material
- DY4727e0
- Treatment
- N fertilizatione0
- Outcome
- internal N-use efficiencye0
- Direction
- negativee0
- Value
- −41%e0
- Qualifier
- 2020e0
- Comparator
- YLY900e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“DY4727 had higher negative response of internal N-use efficiency to N fertilization (−41% in 2020 and −24% in 2021) than YLY900 (−11% in 2020 and −10% in 2021).”
t0“Rice”
Claim · model-written summary
DY4727 internal nitrogen use efficiency declined 24% in 2021.
- Taxon
- RiceOryza sativat0
- Material
- DY4727e0
- Treatment
- N fertilizatione0
- Outcome
- internal N-use efficiencye0
- Direction
- negativee0
- Value
- −24%e0
- Qualifier
- 2021e0
- Comparator
- YLY900e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“DY4727 had higher negative response of internal N-use efficiency to N fertilization (−41% in 2020 and −24% in 2021) than YLY900 (−11% in 2020 and −10% in 2021).”
t0“Rice”
Claim · model-written summary
YLY900 internal nitrogen use efficiency declined 11% in 2020.
- Taxon
- RiceOryza sativat0
- Material
- YLY900e0
- Treatment
- N fertilizatione0
- Outcome
- internal N-use efficiencye0
- Direction
- decreaseinferrede0
- Value
- −11%e0
- Qualifier
- 2020e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“DY4727 had higher negative response of internal N-use efficiency to N fertilization (−41% in 2020 and −24% in 2021) than YLY900 (−11% in 2020 and −10% in 2021).”
t0“Rice”
Claim · model-written summary
YLY900 internal nitrogen use efficiency declined 10% in 2021.
- Taxon
- RiceOryza sativat0
- Material
- YLY900e0
- Treatment
- N fertilizatione0
- Outcome
- internal N-use efficiencye0
- Direction
- decreaseinferrede0
- Value
- −10%e0
- Qualifier
- 2021e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“DY4727 had higher negative response of internal N-use efficiency to N fertilization (−41% in 2020 and −24% in 2021) than YLY900 (−11% in 2020 and −10% in 2021).”
t0“Rice”
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