Direct N2O emission factors for synthetic N‐fertilizer and organic residues applied on sugarcane for bioethanol production in Central‐Southern Brazil

The production and use of biofuels have increased rapidly in recent decades. Bioethanol derived from sugarcane has become a promising alternative to fossil fuel for use in automotive vehicles. The ‘savings’ calculated from the carbon footprint of this energy source still generates many questions rel...

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Bibliographic Details
Published in:Global change biology. Bioenergy 2016-03, Vol.8 (2), p.269-280
Main Authors: Siqueira Neto, Marcos, Galdos, Marcelo V., Feigl, Brigitte J., Cerri, Carlos E. P., Cerri, Carlos C.
Format: Article
Language:English
Subjects:
Agribusiness
Ammonium
Ammonium nitrate
Automobiles
Automotive fuels
Biodiesel fuels
bioethanol
Biofuels
Carbon
carbon footprint
Crop residues
Cultivation
Emission
Emissions
Environmental impact
Ethanol
Experiments
Fertilizers
Filter cake
Food processing industry
Footprint analysis
Fossil fuels
Furrows
Gases
Intergovernmental Panel on Climate Change
Irrigation
Mathematical analysis
Microorganisms
Nitrogen
Nitrous oxide
N‐fertilizer
Planting
Regrowth
Saccharum officinarum L
Soil fertility
Soils
Straw
Sugarcane
Urea
Vinasse
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Summary:The production and use of biofuels have increased rapidly in recent decades. Bioethanol derived from sugarcane has become a promising alternative to fossil fuel for use in automotive vehicles. The ‘savings’ calculated from the carbon footprint of this energy source still generates many questions related to nitrous oxide (N2O) emissions from sugarcane cultivation. We quantified N2O emissions from soil covered with different amounts of sugarcane straw and determined the direct N2O emission factors of nitrogen fertilizers (applied at the planting furrows and in the topdressing) and the by‐products of sugarcane processing (filter cake and vinasse) applied to sugarcane fields. The results showed that the presence of different amounts of sugarcane straw did not change N2O emissions relative to bare soil (control). N‐fertilizer increased N2O emissions from the soil, especially when urea was used, both at the planting furrow (plant cane) and during the regrowth process (ratoon cane) in relation to ammonium nitrate. The emission factor for N‐fertilizer was 0.46 ± 0.33%. The field application of filter cake and vinasse favored N2O emissions from the soil, the emission factor for vinasse was 0.65 ± 0.29%, while filter cake had a lower emission factor of 0.13 ± 0.04%. The experimentally obtained N2O emission factors associated with sugarcane cultivation, specific to the major sugarcane production region of the Brazil, were lower than those considered by the IPCC. Thus, the results of this study should contribute to bioethanol carbon footprint calculations.
ISSN:1757-1693
1757-1707
DOI:10.1111/gcbb.12251