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Transient accumulation of H2 in soil from (A) Vercelli, (B) Fuyang, and (C) Suwan, amended with either rice straw or maize straw and incubated under anoxic conditions in the absence or presence of CH3F (1, 2, and 2% in Vercelli, Fuyang, and Suwan soil, respectively); mean ± SE, n = 3. The insert shows the H2 accumulated in units of partial pressure (Pa).
