Research Article
Applying Sewage Sludge to Eucalyptus grandis Plantations: Effects on Biomass Production and Nutrient Cycling through Litterfall
Table 3
Nutrients added in the treatments through the sewage sludge and mineral fertilizer application to the soil of the experimental forest stands.
| Treatment | Age (days by implantation) | Input (per tree) | N | P | K | Ca | Mg | S | B | Zn | kg ha−1 |
| (1) C (Control) | | no fertilization | — | — | — | — | — | — | — | — |
| | | TOTAL | — | — | — | — | — | — | — | — |
| (2) MF (Mineral fertilizer) | −45 | 1.2 kg dolomite* | — | — | — | 440 | 160 | — | — | — | 7 | 160 g NPK 6 : 30 : 6 + 2% S + 0.5% Zn | 16 | 34 | 13 | — | — | 5 | — | 1.5 | 90 | 70 g ammonium nitrate | 39 | — | — | — | — | — | — | — | 90 | 50 g potassium chloride | — | — | 41 | — | — | — | — | — | 90 | 8 g de Borax | — | — | — | — | — | — | 1.5 | — | 180 | 180 g NPK 20 : 0 : 20 + 0.5% B | 60 | — | 50 | — | — | — | 1.5 | — |
| | | TOTAL | 115 | 34 | 105 | 440 | 160 | 5 | 3 | 2 |
| (3) WS (10 t ha−1 wet sewage) | 7 | 26 kg wet sewage | 320 | 140 | 21 | 248 | 48 | 66 | 0.1 | 24 | 7 | 16 g potassium chloride | — | — | 13 | — | — | — | — | — | 90 | 50 g potassium chloride | — | — | 41 | — | — | — | — | — | 90 | 15 g de Borax | — | — | — | — | — | — | 2.9 | — | 180 | 34 g potassium chloride | — | — | 28 | — | — | — | — | — |
| | | TOTAL | 320 | 140 | 105 | 248 | 48 | 66 | 3 | 24 |
| (4) DS (10 t ha−1 dry sewage) | 7 | 6 kg dry sewage | 322 | 154 | 21 | 228 | 36 | 63 | 0.1 | 32 | 7 | 16 g potassium chloride | — | — | 13 | — | — | — | — | — | 90 | 50 g potassium chloride | — | — | 41 | — | — | — | — | — | 90 | 15 g de Borax | — | — | — | — | — | — | 2.9 | — | 180 | 35 g potassium chloride | — | — | 29 | — | — | — | — | — |
| | | TOTAL | 322 | 154 | 105 | 228 | 36 | 63 | 3 | 24 |
|
|
*Dolomite was broadcast on the soil surface 45 days before planting.
|