JEQ -- Zhao et al. 32 (1): 33 Figure IG1

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Fig. 1. Concentrations of (a) S and (b) ${delta}$ ³⁴S in wheat straw and grain from the control plot of the Broadbalk experiment. The data for UK SO₂ emissions (b) are from United Kingdom Review Group on Acid Rain (1983) and National Expert Group on Transboundary Air Pollution (2001).