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| T | time (weeks) | Lignin-amended | Unamended | p-value | Trend |
| T1 | 1 week | 4.86E+03 (1.37E+03) | 1.54E+03 (4.65E+02) | <0.05 | Lignin>none |
| T2 | 4 weeks | 1.51E+03 (5.31E+02) | 4.39E+02 (8.99E+01) | <0.05 | Lignin>none |
| T3 | 13 weeks | 4.03E+03 (2.84E+03) | 4.07E+03 (1.77E+03) | n.s. | n.a. |
| T4 | 30 weeks | 1.75E+04 (1.38E+04) | 8.10E+05 (7.93E+05) | n.s. | n.a. |
n.s. = not significant; n.a. = not applicable; values are mean total bacteria (standard error, n = 4).
