Mitigation of Greenhouse Gas Emissions from Tropical Soils Amended with Poultry Manure and Sugar Cane Straw Biochars
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Date
2017-09Author
Novais, Sarah Vieira
Zenero, Mariana Delgado Oliveira
Junior, Elizio Ferreira Frade
Lima, Renato Paiva de
Cerri, Carlos Eduardo Pelegrino
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Show full item recordAbstract
Increases in greenhouse gases (GHG) emissions, upon changes in land use
and agricultural management, lead to a search for techniques that enhance
carbon residence time in soil. Pyrolysis increases the recalcitrance of organic
materials and enhances their activities as physical, chemical and biological soil
conditioners. Emissions of CO2, CH4 and N2O quantified from a sandy soil
that was treated with three rates (12.5, 25 e 50 Mg∙ha−1
) of either non-pyrolysed
poultry manure and sugarcane straw or biochars, pyrolysed at two contrasting
temperatures (350˚C and 650˚C). Subsequently, the flux of the three
gases was converted and compared in a standard unit (CO2eq). The added biochars,
significantly reduced GHG emissions, especially CO2, relative to the
non-pyrolysed materials. The greatest differences between applied rates of
poultry manure, relative sugarcane straw, both to biochar and raw material,
and the positive response to the increase of pyrolysis temperture, confirm the
importance of raw material choice for biochar production, with recalcitrance
being an important initial characteristic. Greater emissions occurred with intermediate
rate of biochars (25 Mg∙ha−1
) amendment to the soil. These intermediate
rates had higher microbial biomass, provided by an intermediate C/N
ratio derived from the original soil and the biochar, promoting combined levels
of labile C and oxygen availability, leading to an optimal environment for
microbiota.
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- Agriculture [96]