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Table 1 Soil pH change along rotations from the end of the first 7-year-rotation (R1Y7), to year 2 of the second rotation (R2Y2) and 5 of the second rotation (R2Y5)

From: Soil organic matter quality along rotations in acacia and eucalypt plantations in the Congolese coastal plains

  R1Y7 R2Y2 R2Y5
100A 50A50E 100E 100A 50A50E 100E 100A 50A50E 100E
pH-H2O 4.2 (± 0.03) c 4.4 (± 0.02) b 4.5 (± 0.04) a 4.4 (± 0.02) a 4.3 (± 0.03) a 4.4 (± 0.03) a 3.9 (± 0.05) b 4.0 (± 0.03) b 4.2 (± 0.04) a
pH-KCl 3.5 (± 0.02) a 3.5 (± 0.02) a 3.5 (± 0.03) a 3.3 (± 0.02) a 3.2 (± 0.02) b 3.3 (± 0.03) a 3.5 (± 0.02) a 3.5 (± 0.02) a 3.5 (± 0.04) a
Delta pH (∆pH) 0.8 (± 0.03) c 0.9 (± 0.01) b 1.0 (± 0.02) a 1.1 (± 0.02) a 1.1 (± 0.02) b 1.1 (± 0.03) a 0.4 (± 0.06) ab 0.5 (± 0.03) b 0.6 (± 0.05) a
  1. Different letters indicate significant differences at P = 0.05 between stand types at each rotation stage and along rotations