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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Crop residue removal and nitrification inhibitor application as strategies to mitigate N2O emissions in sugarcane fields

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Autor(es):
Gonzaga, Leandro Carolino [1, 2] ; Nunes Carvalho, Joao Luis [1] ; de Oliveira, Bruna Gonsalves [2] ; Soares, Johnny Rodrigues [3] ; Cantarella, Heitor [2]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Natl Ctr Res Energy & Mat, Brazilian Bioethanol Sci & Technol Lab CTBE, Rua Giuseppe Maximo Scolfaro 10000, BR-13083970 Campinas, SP - Brazil
[2] IAC, Soils & Environm Resources Ctr, Av Barao Itapura 1481, BR-13020902 Campinas, SP - Brazil
[3] Univ Estadual Campinas, Sch Agr Engn, Av Candido Rondon 501, BR-13083875 Campinas, SP - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: BIOMASS & BIOENERGY; v. 119, p. 206-216, DEC 2018.
Citações Web of Science: 0
Resumo

Nitrous oxide (N2O) emission estimates are important to ascertain the greenhouse gas balance of ethanol produced from sugarcane. We quantified N2O emissions in the presence of sugarcane crop residues, N fertilizer (ammonium sulfate), and a nitrification inhibitor (NI, dicyandiamide). Two field experiments were conducted to evaluate the implications of N fertilizer application during dry and wet seasons at two locations in southeast Brazil. Treatments consisted of four levels of crop residue (0, 5, 10, and 15 Mg ha(-1)) and three of N fertilizer (0 and 120 kg ha(-1) and 120 kg ha(-1) plus NI). N2O emission was measured using the closed chamber method and sugarcane yield via mechanical harvest. N2O emissions were higher in wet than in dry seasons following N fertilizer application, albeit affected by crop residue and NI in both. Retaining crop residues on the soil increased N2O emission and sugarcane yield. The N2O emission factor from N fertilizer ranged from 0.12% to 1.44% of N applied. NI reduced N2O emissions (by 87% and 63% in dry and wet seasons, respectively). Sugarcane yield varied from 42 to 92 Mg ha(-1) of fresh matter stalk and emission intensity from 3.7 to 22.9 kg of CO2eq, Mg of stalk(-1). The lowest greenhouse gas intensity was recorded with 5 Mg ha(-1) crop residue and 120 kg ha(-1) N supplemented with NI. Therefore, partial crop residue removal and NI addition to N fertilizer may be effective strategies to improve the sustainability index of biofuel from sugarcane and reduce N2O emissions and intensity. (AU)

Processo FAPESP: 14/26767-9 - Iniciativa Global Sustainable Bioenergy (GSB): análise ambiental e espacial da intensificação da pastagem para a bioenergia
Beneficiário:John Joseph Sheehan
Linha de fomento: Auxílio à Pesquisa - Programa SPEC
Processo FAPESP: 17/02299-4 - Inibidor de nitrificação como estratégia de mitigação das emissões de N2O em áreas de cultivo de cana-de-açúcar
Beneficiário:Bruna Gonçalves de Oliveira Carvalho
Linha de fomento: Bolsas no Brasil - Pós-Doutorado