Research Article
Applying Sewage Sludge to Eucalyptus grandis Plantations: Effects on Biomass Production and Nutrient Cycling through Litterfall
Table 4
Aboveground tree biomass accumulated at 12, 24, and 36 months after planting.
| | Treatment | Biomass (Mg ha−1) | | | Leaf | | Bark | | Wood | | Branch | | Total | |
| | 12 months |
| | Control | 1.1 | b | 0.6 | b | 3.2 | C | 1.5 | b | 6.5 | c | | Mineral fertilizer | 1.4 | b | 1.1 | a | 7.0 | b | 2.3 | a | 11.8 | b | | Wet sewage | 2.6 | a | 1.2 | a | 7.8 | ab | 2.3 | a | 13.9 | ab | | Dry sewage | 2.9 | a | 1.3 | a | 9.2 | a | 2.6 | a | 15.9 | a |
| | 24 months |
| | Control | 4.1 | b | 2.4 | b | 13.2 | b | 4.3 | b | 24.0 | b | | Mineral fertilizer | 7.2 | a | 4.8 | a | 34.5 | a | 8.0 | a | 54.6 | a | | Wet sewage | 7.4 | a | 4.4 | a | 31.1 | a | 7.4 | a | 50.3 | a | | Dry sewage | 8.6 | a | 5.3 | a | 37.6 | a | 8.8 | a | 60.3 | a |
| | 36 months |
| | Control | 2.1 | c | 4.2 | c | 41.4 | C | 4.0 | c | 51.7 | C | | Mineral fertilizer | 3.9 | a b | 6.6 | b | 76.8 | a b | 6.0 | a b | 93.3 | a b | | Wet sewage | 3.6 | b | 6.5 | b | 71.3 | b | 5.7 | b | 87.2 | B | | Dry sewage | 4.4 | a | 8.0 | a | 87.5 | a | 6.6 | a | 106.5 | A |
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Significant differences () among treatments at a given age are indicated by different letters in the same column.
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