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BIOLOGICAL ASSETS (Tables) | 12 Months Ended
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Dec. 31, 2019
BIOLOGICAL ASSETS |
Schedule of changes in balances of biological assets |
Balances on December 31, 2017 |  | 4,548,897
Addition |  | 1,285,490
Depletion |  | (709,547)
Loss on fair value adjustment |  | (129,187)
Disposal |  | (47,124)
Other write-offs |  | (12,624)
Balances on December 31, 2018 |  | 4,935,905
Business combination with Fibria (1) |  | 4,579,526
Addition |  | 2,849,039
Depletion |  | (1,905,118)
Gain on fair value adjustment |  | 185,399
Disposal |  | (23,764)
Other write-offs |  | (49,488)
Balances on December 31, 2019 |  | 10,571,499
| 1) |  | Business combination with Fibria and its subsidiaries held on January 3, 2019, Note 1.2.1.
Schedule of main assumptions for calculation of fair value of biological assets |
|  | December 31,
|  | 2019
Planted useful area (hectare) |  | 988,720
Mature assets |  | 86,352
Immature assets |  | 902,368
Average annual growth (IMA) - m3 /hectare /year |  | 38.34
Average gross sale price of eucalyptus - R$/m3 |  | 66.81
Discount rate - % |  | 8.4%
Summary of fair value adjustment of biological assets recognized under other operating income (expense), net |
|  | December 31,
|  | 2019
Physical changes |  | (347,409)
Price |  | 532,808
|  | 185,399

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