title: Nitrous Oxide and Methane Fluxes Following Ammonium Sulfate and Vinasse Application on Sugar Cane Soil.
abstract: This study aimed to quantify nitrous oxide (N2O) and methane (CH4) emission/sink response from sugar cane soil treated with fertilizer nitrogen (N) and vinasse applied separately or in sequence, the latter being investigated with regard to the time interval between applications for a possible effect on emissions. The study was carried out in a traditional area of unburned sugar cane in São Paulo state, Brazil. Two levels of N fertilization (0 and 100 kg N ha(-1)) with no added vinasse and combined with vinasse additions at different times (100 m(-3) ha(-1) at 3 and 15 days after N fertilization) were evaluated. Methane and N2O fluxes were monitored for 211 days. On average, the soil was a sink for CH4, which was not affected by the treatments. Emissions of N2O were induced by N fertilizer and vinasse applications. For ammonium sulfate, 0.6% of the added N was emitted as N2O, while for vinasse, this ranged from 1.0 to 2.2%. Changes in N2O fluxes were detected the day after application of vinasse on the N fertilized areas, but although the emission factor (EF) was 34% greater, the EF was not significantly different from fertilizer N alone. Nevertheless, we recommend to not apply vinasse after N fertilization to avoid boosting N2O emissions.
authors: COPPE, Centro de Tecnologia, Universidade Federal do Rio de Janeiro , Rio de Janeiro 21941-450, Rio de Janeiro Brazil.
authors: Debora da S
authors: Dda S
authors: Paredes
authors: Embrapa Agrobiologia , Seropédica 23891-000, Rio de Janeiro Brazil.
authors: Bruno J R
authors: BJ
authors: Alves
authors: COPPE, Centro de Tecnologia, Universidade Federal do Rio de Janeiro , Rio de Janeiro 21941-450, Rio de Janeiro Brazil.
authors: Marco A
authors: MA
authors: dos Santos
authors: Instituto Agronômico (IAC), APTA Regional Centro-Leste , Ribeirão Preto 14032-800, São Paulo Brazil.
authors: Denizart
authors: D
authors: Bolonhezi
authors: Embrapa Agrobiologia , Seropédica 23891-000, Rio de Janeiro Brazil.
authors: Selenobaldo A C
authors: SA
authors: Sant'Anna
authors: Embrapa Agrobiologia , Seropédica 23891-000, Rio de Janeiro Brazil.
authors: Segundo
authors: S
authors: Urquiaga
authors: Embrapa Meio-Ambiente , Jaguariúna 13820-000, São Paulo Brazil.
authors: Magda A
authors: MA
authors: Lima
authors: Embrapa Agrobiologia , Seropédica 23891-000, Rio de Janeiro Brazil.
authors: Robert M
authors: RM
authors: Boddey
mesh_terms: D064751:Ammonium Compounds / Q000032:analysis; D000645:Ammonium Sulfate / Q000737:chemistry*; D001938:Brazil; D005308:Fertilizers; D017752:Greenhouse Effect; D008697:Methane / Q000032:analysis*; D009566:Nitrates / Q000032:analysis; D009584:Nitrogen / Q000032:analysis; D009609:Nitrous Oxide / Q000032:analysis*; D016062:Porosity; D011891:Rain; D031786:Saccharum / Q000737:chemistry*; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis; D013696:Temperature; D014865:Waste Disposal, Fluid; D014867:Water
chemical_list: D064751:Ammonium Compounds; D005308:Fertilizers; D009566:Nitrates; D012987:Soil; D012989:Soil Pollutants; D014867:Water; D009609:Nitrous Oxide; D009584:Nitrogen; D008697:Methane; D000645:Ammonium Sulfate