Abstract
SummaryThe growth efficiency (GE), specific dark-respiration rate (Rs) and crop growth rate (CGR) of rice plants grown in the field with applications of nitrogen fertilizer at 0, 11 and 17 g per m2 were examined every two weeks in 1996 and 1997. Rs was the highest at the rooting stage, and decreased rapidly until the heading time and gradually thereafter. The nitrogen concentration (NG) of the plant also decreased during ontogeny. NC at each growth stage varied with the amount of nitrogen supply, but Rs did not. This suggests that NC did not directly influence Rs. A linear relationship was observed between NG and Rs determined for all growth stages as a whole. However, the slope of the NC-Rs regression line greatly varied with the growth stage. The value of GE, CGR/ (CGR+R) (R, respiratory loss), was within a range of 60-70% during the early growth stage independent of nitrogen supply, but that during the grain-filling period was lowered by increased nitrogen supply. The nitrogen fertilization increased phytomass and grain yield, accompanied by the increase in respiratory loss. In 1997, a larger amount of carbohydrates was consumed for respiration than in 1996, due to higher atmospheric temperatures during the grain-filling period, and GE at the later stage in 1997 was lower than that in 1996. This means that the increased respiratory loss at high temperatures may be a cause of GE depression.
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Claims 13
Claim · model-written summary
Specific dark respiration was highest at rooting and declined through heading and afterward.
- Taxon
- rice plants
Oryza sativat0 - Organ / stage
- rooting stagee0
- Outcome
- Rse0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rs was the highest at the rooting stage, and decreased rapidly until the heading time and gradually thereafter.”
t0“Rice Plants”
Claim · model-written summary
Plant nitrogen concentration decreased during ontogeny.
- Taxon
- rice plantsOryza sativat0
- Outcome
- nitrogen concentratione0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The nitrogen concentration (NG) of the plant also decreased during ontogeny.”
t0“Rice Plants”
Claim · model-written summary
Nitrogen concentration varied with nitrogen supply at each growth stage.
- Taxon
- rice plantsOryza sativat0
- Treatment
- nitrogen supplye0
- Outcome
- NCe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NC at each growth stage varied with the amount of nitrogen supply, but Rs did not.”
t0“Rice Plants”
Claim · model-written summary
Specific respiration did not vary with nitrogen supply at each growth stage.
- Taxon
- rice plantsOryza sativat0
- Treatment
- nitrogen supplye0
- Outcome
- Rse0
- Direction
- no_changeinferrede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NC at each growth stage varied with the amount of nitrogen supply, but Rs did not.”
t0“Rice Plants”
Claim · model-written summary
Nitrogen concentration and respiration showed a linear relationship across growth stages.
- Taxon
- rice plantsOryza sativat0
- Compound
- NGe0
- Outcome
- Rse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A linear relationship was observed between NG and Rs determined for all growth stages as a whole.”
t0“Rice Plants”
Claim · model-written summary
The nitrogen concentration–respiration regression slope varied greatly by growth stage.
- Taxon
- rice plantsOryza sativat0
- Organ / stage
- growth stagee0
- Outcome
- slope of the NC-Rs regression linee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the slope of the NC-Rs regression line greatly varied with the growth stage.”
t0“Rice Plants”
Claim · model-written summary
Early growth efficiency was 60–70% regardless of nitrogen supply.
- Taxon
- rice plantsOryza sativat0
- Organ / stage
- early growth stagee0
- Outcome
- GEe1
- Value
- 60-70%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“was within a range of 60-70% during the early growth stage independent of nitrogen supply”
t0“Rice Plants”
e1“The value of GE”
Claim · model-written summary
More nitrogen lowered growth efficiency during grain filling.
- Taxon
- rice plantsOryza sativat0
- Organ / stage
- grain-filling periode0
- Treatment
- increased nitrogen supplye0
- Outcome
- GEe1
- Direction
- lowerede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“that during the grain-filling period was lowered by increased nitrogen supply.”
t0“Rice Plants”
e1“The value of GE”
Claim · model-written summary
Nitrogen fertilization increased phytomass.
- Taxon
- rice plantsOryza sativat0
- Treatment
- nitrogen fertilizatione0
- Outcome
- phytomasse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The nitrogen fertilization increased phytomass and grain yield, accompanied by the increase in respiratory loss.”
t0“Rice Plants”
Claim · model-written summary
Nitrogen fertilization increased grain yield.
- Taxon
- rice plantsOryza sativat0
- Treatment
- nitrogen fertilizatione0
- Outcome
- grain yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The nitrogen fertilization increased phytomass and grain yield, accompanied by the increase in respiratory loss.”
t0“Rice Plants”
Claim · model-written summary
Nitrogen fertilization increased respiratory loss.
- Taxon
- rice plantsOryza sativat0
- Treatment
- nitrogen fertilizatione0
- Outcome
- respiratory losse0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The nitrogen fertilization increased phytomass and grain yield, accompanied by the increase in respiratory loss.”
t0“Rice Plants”
Claim · model-written summary
Respiration consumed more carbohydrates in 1997 than in 1996.
- Taxon
- rice plantsOryza sativat0
- Outcome
- carbohydrates was consumed for respiratione0
- Direction
- largere0
- Comparator
- 1996e0
- Setting
- 1997e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 1997, a larger amount of carbohydrates was consumed for respiration than in 1996, due to higher atmospheric temperatures during the grain-filling period”
t0“Rice Plants”
Claim · model-written summary
Late-stage growth efficiency was lower in 1997 than in 1996.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GE at the later stage in 1997 was lower than that in 1996.”
t0“Rice Plants”
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