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Fig. 6. Cumulative soil-derived CO2–C during the whole growing season calculated by using linear extrapolation. Filled bars, zero fertilization; open bars, low fertilization; and crossed bars, high fertilization. Setting the value for the no-plant treatment as 100%, the value for the soybean treatment is 275, 262, and 256% for zero, low, and high fertilization levels, respectively; and for the wheat treatment is 201, 186, and 201% for the three fertilization levels, respectively.
