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BIOLOGICAL ASSETS - Fair value adjustment (Details) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair value adjustment of biological assets recognized under other operating income (expense), net      
Physical changes R$ 156,906 R$ (347,409)  
Price 309,578 532,808  
Fair value adjustment of biological assets recognized under other operating income (expense), net 466,484 185,399 R$ (129,187)
Biological assets pledged R$ 140,142 R$ 0