300, 600 and 900 ppm Increases in the Air's CO2 Concentration:
For a more detailed description of this table, click here.
Asclepias syriaca L. [Common Milkweed]
|
300 ppm
|
600 ppm
|
900 ppm
|
|
| Number of Results |
3
|
|
|
| Arithmetic Mean |
31%
|
|
|
| Standard Error |
15.5%
|
|
|
|
Experimental Conditions
|
300 ppm
|
600 ppm
|
900 ppm
|
|
|
Hughes and Bazzaz (1997) |
glasshouse modules
|
69%
|
|
|
|
Vannette and Hunter (2011) |
Above-ground growth of well-watered initially four-week-old plants grown from seed in individual 1-L pots filled with a 2:1 mix of potting soil and local sandy soil kept in open-top chambers out-of-doors for nine more weeks in northern Michigan (USA)
|
13%
|
|
|
|
Vannette and Hunter (2011) |
Below-ground growth of well-watered initially four-week-old plants grown from seed in individual 1-L pots filled with a 2:1 mix of potting soil and local sandy soil kept in open-top chambers out-of-doors for nine more weeks in northern Michigan (USA)
|
11%
|
|
|