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Biological assets (Tables) | 12 Months Ended
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Dec. 31, 2018
Biological assets. |
Schedule of changes in balances of biological assets |
Balances on December 31, 2016 |  | 4,072,528
Additions (a) |  | 912,368
Depletion for the year |  | (551,135)
Gain on adjustment to fair value |  | 192,504
Disposal of forests |  | (28,030)
Other write-offs |  | (49,338)
Balances on December 31, 2017 |  | 4,548,897
Additions (a) |  | 1,285,490
Depletion for the year |  | (709,547)
Loss on adjustment to fair value |  | (129,187)
Disposal of forests |  | (47,124)
Other write-offs |  | (12,624)
Balances on December 31, 2018 |  | 4,935,905
| (a) |  | Refers to the formation and acquisition of forests of which R$ 852,156 of forest formation and R$ 433,334 of forest acquisition. (December 31, 2017, R$ 775,954 and R$ 136,414, respectively). The costs incurred to lease lands with subsidiaries are eliminated.
Schedule of main assumptions for calculation of fair value of biological assets |
Assumptions Used |  | 12/31/2018 |  | 12/31/2017 |  | 12/31/2016 |
Planted useful area (hectare) |  | 463,801 |  | 466,535 |  | 450,474 |
Mature assets |  | 68,207 |  | 73,897 |  | 84,084 |
Immature assets |  | 395,594 |  | 392,638 |  | 366,390 |
Average annual growth (IMA) - m /hectare |  | 29.93 |  | 28.89 |  | 33.80 |
Average gross sale price of eucalyptus - R$/m3 |  | 68.62 |  | 69.19 |  | 53.45 |
Utilization cost of Company's assets that contribute - % |  | 4.50% |  | 4.44% |  | 5.00% |
Discount rate - % |  | 9.36% |  | 9.11% |  | 10.54% |

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- Definition The disclosure of the reconciliation of changes in biological assets. [Refer: Biological assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 41 -IssueDate 2018-01-01 -Paragraph 50 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=41&date=2018-03-01&anchor=para_50&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Tabular disclosure of main assumptions for calculation of fair value of biological assets. + References No definition available. + Details
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