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8. BIOLOGICAL ASSETS (Details Narrative) - BRL (R$) R$ / shares in Units, R$ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of detailed information about biological assets [abstract] |  |  |
Depreciation of breeding stock | R$ 876,976 | R$ 798,239 | R$ 784,524
Discount rate used in the valuation | 6.00% | 7.07% |
Weighted average price used in the valuation of biological assets | R$ 34.63 | R$ 32.99 |
Forests pledged as collateral for financing contingencies | R$ 68,381 | R$ 62,408 |

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- Definition The amount of biological assets pledged as security for liabilities. [Refer: Biological assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 41 -IssueDate 2020-01-01 -Paragraph 49 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=41&code=ifrs-tx-2020-en-r&anchor=para_49_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of depreciation recognised on biological assets. [Refer: Depreciation and amortisation expense; Biological assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 41 -IssueDate 2020-01-01 -Paragraph 55 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=41&code=ifrs-tx-2020-en-r&anchor=para_55_c&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The depreciation rate used for biological assets. [Refer: Biological assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 41 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=41&code=ifrs-tx-2020-en-r&anchor=para_54_e&doctype=Standard -URIDate 2020-01-01 + Details
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