Abstract
ABSTRACT Many experiments to determine the crop yield increase expected with rising atmospheric carbon dioxide concentration added carbon dioxide only during the daytime, without tests of whether elevation of carbon dioxide at night affected plant growth. In this experiment, two cultivars of common bean ( Phaseolus vulgaris L.) were grown in the field for 4 yr in open‐top chambers in which CO 2 was added during the day or the night, both day and night, or not at all. CO 2 was added to increase the concentration by 180 μmol mol −1 above that of the ambient outside air, which averaged 392 μmol mol −1 during the daytime and 503 μmol mol −1 at night. In the two cultivars, the average increase in seed yield above the ambient CO 2 treatment was 42% with daytime CO 2 enrichment and 77% with continuous enrichment. In both cultivars, continuous CO 2 enrichment increased the area of individual leaflets by about 40% compared with daytime enrichment. Leaflet size was the same with daytime CO 2 enrichment and with no enrichment. In one of the cultivars, nighttime CO 2 elevation alone increased leaflet size and seed yield. The results indicated that CO 2 enrichment at night had important consequences for the growth and yield of these bean cultivars, and that daytime‐only CO 2 enrichment greatly underestimated the yield increase likely to occur with rising atmospheric CO 2 concentrations.
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Claims 7
Claim · model-written summary
Daytime CO2 enrichment increased seed yield by 42% over ambient.
- Taxon
- common bean
Phaseolus vulgarist0 - Treatment
- daytime CO 2 enrichmente0
- Outcome
- seed yielde0
- Direction
- increaseinferrede0
- Value
- 42%e0
- Comparator
- ambient CO 2 treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the average increase in seed yield above the ambient CO 2 treatment was 42% with daytime CO 2 enrichment”
t0“common bean”
Claim · model-written summary
Continuous CO2 enrichment increased seed yield by 77% over ambient.
- Taxon
- common beanPhaseolus vulgarist0
- Treatment
- continuous enrichmente0
- Outcome
- seed yielde0
- Direction
- increaseinferrede0
- Value
- 77%e0
- Comparator
- ambient CO 2 treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the average increase in seed yield above the ambient CO 2 treatment was 42% with daytime CO 2 enrichment and 77% with continuous enrichment”
t0“common bean”
Claim · model-written summary
Continuous enrichment increased individual leaflet area about 40% versus daytime enrichment.
- Taxon
- common beanPhaseolus vulgarist0
- Treatment
- continuous CO 2 enrichmente0
- Outcome
- area of individual leafletse0
- Direction
- increasede0
- Value
- about 40%e0
- Comparator
- daytime enrichmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“continuous CO 2 enrichment increased the area of individual leaflets by about 40% compared with daytime enrichment”
t0“common bean”
Claim · model-written summary
Daytime enrichment left leaflet size the same as no enrichment.
- Taxon
- common beanPhaseolus vulgarist0
- Treatment
- daytime CO 2 enrichmente0
- Outcome
- Leaflet sizee0
- Direction
- the samee0
- Comparator
- no enrichmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaflet size was the same with daytime CO 2 enrichment and with no enrichment”
t0“common bean”
Claim · model-written summary
Nighttime CO2 elevation alone increased leaflet size in one cultivar.
- Taxon
- common beanPhaseolus vulgarist0
- Treatment
- nighttime CO 2 elevation alonee0
- Outcome
- leaflet sizee0
- Direction
- increasede0
- Qualifier
- one of the cultivarse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In one of the cultivars, nighttime CO 2 elevation alone increased leaflet size and seed yield”
t0“common bean”
Claim · model-written summary
Nighttime CO2 elevation alone increased seed yield in one cultivar.
- Taxon
- common beanPhaseolus vulgarist0
- Treatment
- nighttime CO 2 elevation alonee0
- Outcome
- seed yielde0
- Direction
- increasede0
- Qualifier
- one of the cultivarse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In one of the cultivars, nighttime CO 2 elevation alone increased leaflet size and seed yield”
t0“common bean”
Claim · model-written summary
Daytime-only enrichment underestimated the yield increase expected under rising CO2.
- Taxon
- common beanPhaseolus vulgarist0
- Treatment
- daytime‐only CO 2 enrichmente0
- Outcome
- yield increasee0
- Direction
- underestimatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“daytime‐only CO 2 enrichment greatly underestimated the yield increase likely to occur with rising atmospheric CO 2 concentrations”
t0“common bean”
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See all 22 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.