Decomposition of sugarcane straw: Basis for management decisions for bioenergy production

Autor(es)

Pimentel, Laisa G. ^[1] ; Cherubin, Mauricio R. ^[2] ; Oliveira, Dener M. S. ^[3] ; Cerri, Carlos E. P. ^[1] ; Cerri, Carlos C. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Luiz de Queiroz Coll Agr, 11 Padua Dias Ave, BR-13418900 Piracicaba, SP - Brazil

^[2] Univ Sao Paulo, Ctr Nucl Energy Agr, 303 Centenario Ave, BR-13400970 Piracicaba, SP - Brazil

^[3] Fed Inst Goiano, Campus Posse, Correntina St 824, BR-73900000 Posse, Go - Brazil

• Tipo de documento: Artigo Científico
• Fonte: BIOMASS & BIOENERGY; v. 122, p. 133-144, MAR 2019.
• Citações Web of Science: 5

Resumo

Straw dead stock is a key driver for crop residue management decisions regarding bioenergy production. Therefore, a field study was conducted to evaluate the sugarcane straw decomposition under different straw removal rates, characterize straw composition changes, and quantify the straw-derived C and N loss. Four sugarcane straw removal rates were evaluated: no removal (14.0 Mg ha(-1) of DM), 25 (10.5 Mg ha(-1) of DM), 50 (7.0 Mg ha(-1) of DM) and 75% (3.5 Mg ha(-1) of DM) of straw removal. Our results showed that straw removal rate had no effect on first year of straw deposition, but during the second year, the lowest decomposition was associated with higher straw removal rates. Dry mass loss was also approximately 25% higher in the second year than in the first. Furthermore, carbon and nitrogen loss were two- and threefold higher in the first year compared to the second year of deposition. Overall, cellulose and hemicellulose decreased by 13 and 7%, respectively, while lignin increased proportionally by 92% during the two year experiment. Our findings suggest that the most appropriate removal rate to maintain soil quality and meet the demands for energy production is 50% of the total straw deposited on the soil. (AU)

• Processo FAPESP: 15/00308-0 - Decomposição de diferentes quantidades de palha de cana-de-açúcar depositadas sobre o solo na região Centro-Sul do Brasil
• Beneficiário: Laisa Gouveia Pimentel
• Linha de fomento: Bolsas no Brasil - Doutorado
• Processo FAPESP: 14/08632-9 - Matéria orgânica do solo em áreas de mudança de uso da terra para cultivo da cana-de-açúcar no Centro-Sul do Brasil
• Beneficiário: Dener Márcio da Silva Oliveira
• Linha de fomento: Bolsas no Brasil - Doutorado