Fumigation, species, and fumigation × species effects for chemical parameters of <i>S. canandensis</i> and <i>Taraxacum</i> grown under control, elevated CO₂, or elevated O₃.

1C:N = carbon-nitrogen ratio, N = nitrogen concentration, TNC = total nonstructural carbohydrate concentration, ADF = acid detergent fiber concentration, ADL = acid detergent lignin concentration, IVDMD = in vitro dry matter digestibility, IVND = in vitro nitrogen digestibility, RP-DM = difference in percent digestibility of IVDMD by protein-binding compounds within the plant, RP-N = difference in percent digestibility of IVND by protein-binding compounds within the plant.