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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Gonzaga, Leandro Carolino [1, 2] ; Nunes Carvalho, Joao Luis [1] ; de Oliveira, Bruna Gonsalves [2] ; Soares, Johnny Rodrigues [3] ; Cantarella, Heitor [2]
Total Authors: 5
[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
Total Affiliations: 3
Document type: Journal article
Source: BIOMASS & BIOENERGY; v. 119, p. 206-216, DEC 2018.
Web of Science Citations: 7

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)

FAPESP's process: 17/02299-4 - Nitrification inhibitor as strategy to mitigate N2O emissions in sugarcane production
Grantee:Bruna Gonçalves de Oliveira Carvalho
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 14/26767-9 - Global Sustainable Bioenergy Initiative: geospatial & environmental analysis of pastureland intensification for bioenergy
Grantee:John Joseph Sheehan
Support type: Research Projects - SPEC Program