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. 2012 Jan 20;3:4. doi: 10.3389/fmicb.2012.00004

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Copyright © 2012 Conrad, Klose, Lu and Chidthaisong.

This is an open-access article distributed under the terms of the Creative Commons Attribution Non Commercial License, which permits non-commercial use, distribution, and reproduction in other forums, provided the original authors and source are credited.

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Percentage of CH₄ produced from H₂/CO₂ ( $f_{H_{2}}$ ) in soil from (A) Vercelli, (B) Fuyang, and (C) Suwan, amended with either rice straw or maize straw, as calculated using Equation 4, and the data shown in Figures 4 and 5.