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Cumulative release of 14CO2 radioactivity during incubation of lysimeter topsoil in duplicate samples. Squares, moist soil; triangles, soil slurries. The times of addition of radioactivity and the amounts of radioactivity added are indicated by arrows. The break in one duplicate of the slurry incubation at day 125 is due to the accidental release of alkali from the CO2 trap.
