300, 600 and 900 ppm Increases in the Air's CO2 Concentration:
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Digitalis purpurea L. [Purple Foxglove]
|
300 ppm
|
600 ppm
|
900 ppm
|
|
| Number of Results |
2
|
|
|
| Arithmetic Mean |
17.5%
|
|
|
| Standard Error |
2.5%
|
|
|
|
Experimental Conditions
|
300 ppm
|
600 ppm
|
900 ppm
|
|
|
Hunt et al. (1991) |
pots (1 liter)
|
14%
|
|
|
|
Schadler et al. (2007) |
Well watered and fertilized plants grown from seed for five weeks in pots filled with standard potting soil that were enclosed within tents made from translucid plastic foil that were located in a walk-in growth chamber
|
21%
|
|
|