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BIOLOGICAL ASSETS - Changes (Details) - BRL (R$)
R$ in Thousands
12 Months Ended
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