Abstract
The effects of combining atmospheric CO2 concentrations (360 vs. 700 μL L−1) and N fertilizer on the growth, yield and grain nutrients of a semi-dwarf, japonica rice (Oryza sativa L.) were examined by the use of artificially illuminated growth chambers. Throughout the growth period, elevated CO2 + high N promoted dry-matter production, and under elevated CO2, the optimum N level was even higher. Flowering occurred earlier under elevated CO2, but was delayed by higher N levels. The position of the flag leaf fell by one “slot” and the lengths of the culm and panicle decreased due to the elevated CO2. Elevated CO2 + high N enlarged the yield capacity in terms of the numbers of panicles and grains but higher yield did not necessarily occur, because of the decreased percentage of productive tillers. The effects of CO2 on the mineral content were complex, but under elevated CO2 + high N, two parameters (K + Mg, Mg/K) which indicate good rice quality were ameliorated.
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Claims 9
Claim · model-written summary
Elevated CO2 with high N promoted dry matter production.
- Taxon
- Rice
Oryza sativat0 - Treatment
- elevated CO2 + high Ne0
- Outcome
- dry-matter productione0
- Direction
- promotede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“elevated CO2 + high N promoted dry-matter production”
t0“Rice”
Claim · model-written summary
Under elevated CO2, the optimum nitrogen level was higher.
- Taxon
- RiceOryza sativat0
- Treatment
- elevated CO2e0
- Outcome
- optimum N levele0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under elevated CO2, the optimum N level was even higher.”
t0“Rice”
Claim · model-written summary
Elevated CO2 advanced flowering.
- Taxon
- RiceOryza sativat0
- Treatment
- elevated CO2e0
- Outcome
- Floweringe0
- Direction
- earliere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Flowering occurred earlier under elevated CO2”
t0“Rice”
Claim · model-written summary
Higher nitrogen delayed flowering.
- Taxon
- RiceOryza sativat0
- Treatment
- higher N levelse0
- Outcome
- Floweringe0
- Direction
- delayede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Flowering occurred earlier under elevated CO2, but was delayed by higher N levels.”
t0“Rice”
Claim · model-written summary
Elevated CO2 lowered the flag-leaf position by one slot.
- Taxon
- RiceOryza sativat0
- Treatment
- elevated CO2e0
- Outcome
- position of the flag leafe0
- Direction
- felle0
- Value
- one “slot”e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The position of the flag leaf fell by one “slot” and the lengths of the culm and panicle decreased due to the elevated CO2.”
t0“Rice”
Claim · model-written summary
Elevated CO2 decreased culm and panicle lengths.
- Taxon
- RiceOryza sativat0
- Treatment
- elevated CO2e0
- Outcome
- lengths of the culm and paniclee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the lengths of the culm and panicle decreased due to the elevated CO2.”
t0“Rice”
Claim · model-written summary
Elevated CO2 with high nitrogen increased panicle and grain numbers.
- Taxon
- RiceOryza sativat0
- Treatment
- Elevated CO2 + high Ne0
- Outcome
- numbers of panicles and grainse0
- Direction
- enlargede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Elevated CO2 + high N enlarged the yield capacity in terms of the numbers of panicles and grains”
t0“Rice”
Claim · model-written summary
The percentage of productive tillers decreased and higher yield did not necessarily occur.
- Taxon
- RiceOryza sativat0
- Outcome
- percentage of productive tillerse0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher yield did not necessarily occur, because of the decreased percentage of productive tillers.”
t0“Rice”
Claim · model-written summary
Under elevated CO2 and high N, two rice quality mineral indicators improved.
- Taxon
- RiceOryza sativat0
- Treatment
- elevated CO2 + high Ne0
- Outcome
- two parameters (K + Mg, Mg/K) which indicate good rice qualitye0
- Direction
- amelioratede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under elevated CO2 + high N, two parameters (K + Mg, Mg/K) which indicate good rice quality were ameliorated.”
t0“Rice”
The same questions in other papers
co2 · quality: general · Oryza sativa (rice)Positive and negative results
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- no effect
- negative
- negative
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See all 8 papers →nitrogen · quality: general · Oryza sativa (rice)Positive and negative results
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- negative
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- positive
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See all 159 papers →nitrogen · yield · Oryza sativa (rice)Positive and negative results
1,802 papers in the same direction as this paper · 193 in the opposite direction · 49 reporting no difference from an alternative
- negative
- negative
- negative
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See all 2,045 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.