Abstract
Abstract Soybeans [ Glycine max (L.) Merr. cv. Bragg] were grown throughout their life cycle in six controlled‐environment chambers that maintained CO 2 concentrations at 330,450,600, and 800 µmol CO 2 mol −1 air. Air temperatures were controlled, and solar radiation and dewpoint temperatures were measured continually for each chamber. Net photosynthesis and transpiration were computed on 5‐min intervals. The CO 2 enrichment had no apparent effect on the rate of mainstem node development, but leaf area increased at a faster rate proportional to the CO 2 concentration. Daytime CO 2 exchange rate (CER) increased with increasing CO 2 and followed the same trend as final yield. Midday CER was typically about 90 µmol CO 2 m −1 of ground area s −1 for 800 µmol mol −1 and 60 µmol CO 2 m −2 ground area per second for 330 µmol mol −1 chambers. Canopy transpiration rates, leaf area index and vapor pressure deficits were used to compare bulk canopy resistances among CO 2 treatments. Bulk canopy resistance (stomatal and boundary‐layer) of the 800 µmol mol −1 treatment was about 1.6 times that of the 330 µmol mol −1 CO 2 treatment. These results imply that the expected continued increase in global atmospheric CO 2 will increase both agricultural productivity and water use efficiency.
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Claims 8
Claim · model-written summary
Carbon dioxide enrichment had no apparent effect on mainstem node development rate.
- Taxon
- Soybeans
Glycine maxe1 - Treatment
- CO 2 enrichmente0
- Outcome
- rate of mainstem node developmente0
- Direction
- no apparent effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The CO 2 enrichment had no apparent effect on the rate of mainstem node development”
e1“Soybeans [ Glycine max (L.) Merr. cv. Bragg]”
Claim · model-written summary
Leaf area increased faster as carbon dioxide concentration rose.
- Taxon
- SoybeansGlycine maxe1
- Treatment
- CO 2 concentratione0
- Outcome
- leaf areae0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaf area increased at a faster rate proportional to the CO 2 concentration”
e1“Soybeans [ Glycine max (L.) Merr. cv. Bragg]”
Claim · model-written summary
Daytime carbon dioxide exchange rate increased with carbon dioxide concentration.
- Taxon
- SoybeansGlycine maxe1
- Treatment
- CO 2e0
- Outcome
- Daytime CO 2 exchange rate (CER)e0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Daytime CO 2 exchange rate (CER) increased with increasing CO 2 and followed the same trend as final yield”
e1“Soybeans [ Glycine max (L.) Merr. cv. Bragg]”
Claim · model-written summary
Final yield followed the increasing carbon dioxide exchange rate trend.
- Taxon
- SoybeansGlycine maxe1
- Treatment
- CO 2e0
- Outcome
- final yielde0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Daytime CO 2 exchange rate (CER) increased with increasing CO 2 and followed the same trend as final yield”
e1“Soybeans [ Glycine max (L.) Merr. cv. Bragg]”
Claim · model-written summary
Midday CER was about 90 at 800 µmol mol−1 carbon dioxide versus 60 at 330 µmol mol−1.
- Taxon
- SoybeansGlycine maxe1
- Treatment
- 800 µmol mol −1e0
- Outcome
- Midday CERe0
- Direction
- higherinferrede0
- Value
- 90 µmol CO 2 m −1 of ground area s −1e0
- Qualifier
- 60 µmol CO 2 m −2 ground area per seconde0
- Comparator
- 330 µmol mol −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Midday CER was typically about 90 µmol CO 2 m −1 of ground area s −1 for 800 µmol mol −1 and 60 µmol CO 2 m −2 ground area per second for 330 µmol mol −1 chambers”
e1“Soybeans [ Glycine max (L.) Merr. cv. Bragg]”
Claim · model-written summary
Bulk canopy resistance at 800 µmol mol−1 carbon dioxide was about 1.6 times that at 330 µmol mol−1.
- Taxon
- SoybeansGlycine maxe1
- Treatment
- 800 µmol mol −1 treatmente0
- Outcome
- Bulk canopy resistancee0
- Direction
- higherinferrede0
- Value
- 1.6 timese0
- Comparator
- 330 µmol mol −1 CO 2 treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Bulk canopy resistance (stomatal and boundary‐layer) of the 800 µmol mol −1 treatment was about 1.6 times that of the 330 µmol mol −1 CO 2 treatment”
e1“Soybeans [ Glycine max (L.) Merr. cv. Bragg]”
Claim · model-written summary
The authors infer rising atmospheric carbon dioxide will increase agricultural productivity.
- Taxon
- SoybeansGlycine maxe1
- Outcome
- agricultural productivitye0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“expected continued increase in global atmospheric CO 2 will increase both agricultural productivity and water use efficiency”
e1“Soybeans [ Glycine max (L.) Merr. cv. Bragg]”
Claim · model-written summary
The authors infer rising atmospheric carbon dioxide will increase water use efficiency.
- Taxon
- SoybeansGlycine maxe1
- Outcome
- water use efficiencye0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“expected continued increase in global atmospheric CO 2 will increase both agricultural productivity and water use efficiency”
e1“Soybeans [ Glycine max (L.) Merr. cv. Bragg]”
The same questions in other papers
co2 · growth · Glycine max (soybean)Positive and negative results
17 papers in the same direction as this paper · 83 in the opposite direction
- positive
- positive
- positive
97 papers more in this group
See all 101 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.