Abstract
Swiss chard (Beta vulgaris L. var. flavescens D.C.) was grown in gravel culture using Hoagland′s No. 2 solution under polyvinyl plastic growth chambers to investigate the practice of CO2 enrichment of the atmosphere on plant growth. Five chambers were employed with each at 300 (air), 600, 900, 3, 000 and 6, 000 or 30, 000ppm CO2, the concentration being regulated by adjusting the flow of CO2 and air into the chamber. Treatments were for 9 weeks in the early summer and winter experiments and for 24 days in the midsummer experiment. Benchs were maintained above 15°C during the winter experiment.In all experiments, fresh weight and dry weight yields, plant height, and leaf areas markedly increased with increasing CO2 concentrations; but, no significant difference was observed in the number of leaves. In the summer at 3, 000ppm, dry weight yield was five times more than those grown at 300ppm and in the winter the yield was twice as those grown in 300ppm. Fresh weight and dry weight yields did not reach a maximum even at 30, 000ppm.Analyses of leaves at the end of the experiments showed that percentages of the N, P and K on a dry weight basis were nearly the same regardless of treatment.
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Claims 6
Claim · model-written summary
Increasing CO2 raised fresh and dry weight yield, height and leaf area.
- Taxon
- Swiss chard
Beta vulgaris subsp. vulgarist0 - Treatment
- increasing CO2 concentrationse0
- Outcome
- fresh weight and dry weight yields, plant height, and leaf arease0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In all experiments, fresh weight and dry weight yields, plant height, and leaf areas markedly increased with increasing CO2 concentrations;”
t0“Swiss chard (Beta vulgaris L. var. flavescens D.C.) was grown”
Claim · model-written summary
CO2 treatment did not significantly change leaf number.
- Taxon
- Swiss chardBeta vulgaris subsp. vulgarist0
- Treatment
- increasing CO2 concentrationse0
- Outcome
- number of leavese0
- Direction
- no significant differencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In all experiments, fresh weight and dry weight yields, plant height, and leaf areas markedly increased with increasing CO2 concentrations; but, no significant difference was observed in the number of leaves.”
t0“Swiss chard (Beta vulgaris L. var. flavescens D.C.) was grown”
Claim · model-written summary
At 3, 000ppm in summer, dry yield was fivefold the 300ppm yield.
- Taxon
- Swiss chardBeta vulgaris subsp. vulgarist0
- Treatment
- 3, 000ppme0
- Outcome
- dry weight yielde0
- Direction
- moree0
- Value
- five timese0
- Comparator
- 300ppme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the summer at 3, 000ppm, dry weight yield was five times more than those grown at 300ppm”
t0“Swiss chard (Beta vulgaris L. var. flavescens D.C.) was grown”
Claim · model-written summary
At 3, 000ppm in winter, dry yield was twice the 300ppm yield.
- Taxon
- Swiss chardBeta vulgaris subsp. vulgarist0
- Treatment
- 3, 000ppme0
- Outcome
- yielde0
- Direction
- twicee0
- Value
- twicee0
- Comparator
- 300ppme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the summer at 3, 000ppm, dry weight yield was five times more than those grown at 300ppm and in the winter the yield was twice as those grown in 300ppm.”
t0“Swiss chard (Beta vulgaris L. var. flavescens D.C.) was grown”
Claim · model-written summary
Fresh and dry weight yields had not peaked at 30, 000ppm.
- Taxon
- Swiss chardBeta vulgaris subsp. vulgarist0
- Outcome
- Fresh weight and dry weight yieldse0
- Direction
- did not reach a maximume0
- Qualifier
- 30, 000ppme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fresh weight and dry weight yields did not reach a maximum even at 30, 000ppm.”
t0“Swiss chard (Beta vulgaris L. var. flavescens D.C.) was grown”
Claim · model-written summary
Leaf N, P and K percentages were nearly unchanged across treatments.
- Taxon
- Swiss chardBeta vulgaris subsp. vulgarist0
- Treatment
- treatmente0
- Outcome
- percentages of the N, P and Ke0
- Direction
- nearly the samee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“percentages of the N, P and K on a dry weight basis were nearly the same regardless of treatment.”
t0“Swiss chard (Beta vulgaris L. var. flavescens D.C.) was grown”
The same questions in other papers
co2 · growth · Beta vulgaris (beet)Positive and negative results
3 in the opposite direction
- positive
- positive
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co2 · yield · Beta vulgaris (beet)Results agree
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- positive
- positive
- positive
2 papers more in this group
See all 6 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.