Plant Dry Weight (Biomass) Responses to Atmospheric CO2 Enrichment

X
   300 ppm   600 ppm   900 ppm 
Plant Name  Number of
Studies 		  Arithmetic
Mean 		  Standard
Error 		  Number of
Studies 		  Arithmetic
Mean 		  Standard
Error 		  Number of
Studies 		  Arithmetic
Mean 		  Standard
Error 
Xanthium strumarium var. Xanthium strumarium [Canada Cockleburr] 730.6%6.4%        

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