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Strategies to mitigate the nitrous oxide emissions from nitrogen fertilizer applied with organic fertilizers in sugarcane

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Lourenco, Kesia Silva ; Rossetto, Raffaella ; Vitti, Andre Cesar ; Montezano, Zaqueu Fernando ; Soares, Johnny Rodrigues ; Sousa, Rafael de Melo ; do Carmo, Janaina Braga ; Kuramae, Eiko Eurya ; Cantarella, Heitor
Número total de Autores: 9
Tipo de documento: Artigo Científico
Fonte: Science of The Total Environment; v. 650, p. 11-pg., 2019-02-10.

Vinasse is a major byproduct of the sugarcane Would industry, recycled in the fields. However, there is evidence that the application of vinasse with mineral nitrogen (N) fertilizers in sugarcane enhances the emission of greenhouse gases (GHGs). Therefore, strategies are needed to decrease the environmental impacts caused by both inputs. We carried out three sugarcane field experiments by applying N fertilizer (ammonium nitrate) with types of vinasses (concentrated-CV and standard-V) in different combinations (vinasses with N fertilizer and vinasses one month before or after mineral N fertilization). The gases nitrous oxide (N2O), carbon dioxide (CO2), and methane (CH4) were measured in one experiment fertilized in the beginning (fall/winter dry season) and two experiments fertilized in the end (spring rainy season) of the harvest season. Sugarcane fields were sinks rather than sources of CH4, while total carbon emitted as CO2 was similar between seasons and treatments. The effect of mineral fertilization and vinasses (CV and V) on N2O emissions was highly dependent on soil moisture (rain events). The N2O-N fertilizer emission factor (EF) varied from 007% to 0.51%, whereas the average EF of V and CV were 0.66% and 0.34%, respectively. On average across the three experiments, the combination of vinasse (CV or V) with N fertilizer increased the N2O emissions 29-fold compared to that of N fertilizer alone. For CV + N, the EF was 0.94% of the applied N and 0.23% of the ammonium nitrate-N, and for V + N (El 047%), increased emissions were observed in two out of three experiments. The strategy of anticipating or postponing vinasse application by one month with respect to mineral N reduced the N2O emissions by 51% for CV, but not for V. Therefore, to avoid boosting N2O emissions, we suggest applying vinasses (CV and V) before or after mineral N fertilization. (C) 2018 Elsevier B.V. All rights reserved. (AU)

Processo FAPESP: 13/50365-5 - Microbial networks in control of greenhouse gases emissions in biobased agriculture - MiniBag
Beneficiário:Heitor Cantarella
Modalidade de apoio: Auxílio à Pesquisa - Programa BIOEN - Regular
Processo FAPESP: 14/24141-5 - Estudo das redes microbianas (networks) que controlam a emissão de N2O, CO2 e CH4 do solo com cana-de-açúcar
Beneficiário:Késia Silva Lourenço
Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado
Processo FAPESP: 13/12716-0 - Fluxo dos gases do efeito estufa (co2, n2o e ch4) a partir de solos com cana-de-açúcar em função da adubação com vinhaça concentrada e vinhaça não concentrada em diferentes epocas de aplicação.
Beneficiário:Késia Silva Lourenço
Modalidade de apoio: Bolsas no Brasil - Doutorado