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Root lengths (a) and surface areas (b) in the 0–10, 10–20, 20–30 and 30–40 cm root zones for elevated and ambient carbon dioxide treatments. Different letters atop bars indicate significant differences (p≤0.05) between treatments. Photos (c) of stained creeping bentgrass root subsets in the 0–10 cm zone after 84 days of treatment with elevated or ambient CO2 concentrations.
