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Fig. 2. Distribution of total C, total N, and C/N ratio with soil depth at the Closeaux experimental plots. Date represent 10-yr averages (n = 10, filled circles) with standard deviations, averages for 0 to 5 yr of maize (n = 5, empty squares), and 6 to 10 yr of maize (n = 5, empty triangles).
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