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BIOLOGICAL ASSETS - Changes (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Changes in balances of biological assets |  |  |
Balance, beginning of the year | R$ 4,935,905 | R$ 4,548,897 |
Business combination with Fibria | 4,579,526 |  |
Additions | 2,849,039 | 1,285,490 |
Depletion for the year | (1,905,118) | (709,547) |
Gain (Loss) on adjustment to fair value | 185,399 | (129,187) | R$ 192,504
Disposal of forests | (23,764) | (47,124) |
Other write-offs | (49,488) | (12,624) |
Balance, end of the year | R$ 10,571,499 | R$ 4,935,905 | R$ 4,548,897
Effective area of forest from the year of planting | 3 years |  |
Minimum |  |  |
Changes in balances of biological assets |  |  |
Average cycle of forest formation | 6 years |  |
Maximum |  |  |
Changes in balances of biological assets |  |  |
Average cycle of forest formation | 7 years |  |

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- Definition The increase in biological assets resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Biological assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 41 -IssueDate 2019-01-01 -Paragraph 50 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=41&code=ifrs-tx-2019-en-r&anchor=para_50_e&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of additions to biological assets resulting from purchases. [Refer: Biological assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 41 -IssueDate 2019-01-01 -Paragraph 50 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=41&code=ifrs-tx-2019-en-r&anchor=para_50_b&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The decrease in biological assets due to the detachment of produce from the assets or the cessation of the assets' life processes. [Refer: Biological assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 41 -IssueDate 2019-01-01 -Paragraph 50 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=41&code=ifrs-tx-2019-en-r&anchor=para_50_d&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The decrease in biological assets resulting from disposals. [Refer: Biological assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 41 -IssueDate 2019-01-01 -Paragraph 50 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=41&code=ifrs-tx-2019-en-r&anchor=para_50_c&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The gains (losses) arising from changes in fair value less costs to sell of biological assets due to both physical and price changes in the market. [Refer: Biological assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 41 -IssueDate 2019-01-01 -Paragraph 50 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=41&code=ifrs-tx-2019-en-r&anchor=para_50_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The increase (decrease) in biological assets resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Biological assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 41 -IssueDate 2019-01-01 -Paragraph 50 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=41&code=ifrs-tx-2019-en-r&anchor=para_50_g&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of non-current biological assets. [Refer: Biological assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 54 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_f&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The period of harvest cycle with productivity and area of plantation for determining the fair value of biological assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but not limited to, weeks in a year or quarter. + References No definition available. + Details
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- Definition Period for effective area for forest from the year of planting for determining the fair value of biological assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but not limited to, weeks in a year or quarter. + References No definition available. + Details
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