Nitrous oxide and methane fluxes in south Brazilian gleysol as affected by nitrogen fertilizers

Abstract

SUMMARYIndex terms: nitrogen fertilization, environmental impacts, agriculture, greenhouse effect. RESUMO: FLUXOS DE ÓXIDO NITROSO E DE METANO EM GLEISSOLO INFLUENCIADOS PELA APLICAÇÃO DE FERTILIZANTES NITROGENADOS NO SUL DO BRASIL Fertilizantes nitrogenados incrementam os fluxos de óxido nitroso (N 2 O) e podem deprimir a oxidação de metano (CH 4 ) em solos agrícolas. Entretanto, não existem resultados da magnitude desses efeitos nas condições edafoclimáticas do Sul do Brasil, tampouco do potencial de algumas fontes de N em mitigar esses efeitos. O presente estudo objetivou avaliar o impacto da aplicação de fertilizantes nitrogenados (ureia, sulfato de amônio, nitrato de cálcio, nitrato de amônio, Uran, N de liberação lenta e ureia com inibidor de urease) nos fluxos de N 2 O e CH 4 em um Gleissolo no Sul do Brasil (Porto NITROUS OXIDE AND METHANE FLUXES IN SOUTH BRAZILIAN GLEYSOL AS AFFECTED

Gas chromatography and photoacoustic spectroscopy for the assessment of soil greenhouse gases emissions

“…The CH4 fluxes are more relevant in flooded soils where the incorporation of crop residues increases methanogenesis (ZSCHORNACK et al, 2011), but short-term CH4 emissions could also be verified in aerated soils following manure or nitrogen fertilizer amendments (SHERLOCK et al, 2002;ZANATTA et al, 2010). N2O emissions are critical on aerated soils under nitrogen fertilization or inclusion of legumes on the cropping systems (ESCOBAR et al, 2010;ZANATTA et al, 2010).…”

“…N2O emissions are critical on aerated soils under nitrogen fertilization or inclusion of legumes on the cropping systems (ESCOBAR et al, 2010;ZANATTA et al, 2010).…”

“…Most of studies assessing CH4 and N2O fluxes in soil-atmosphere interface are performed by using static chambers for gas sampling and further gas chromatography (GC) analysis (ESCOBAR et al, 2010;GOMES et al, 2009;ZANATTA et al, 2010). Fluxes are then calculated by the linear increase of GHG concentration in the chamber air in a given period (usually < 60min).…”

Nitrogen fluxes from irrigated common‑bean as affected by mulching and mineral fertilization

“…In the same Ferralsol of the present study, Metay et al (2007) observed that N 2 O-N fluxes were positively related to increasing water-filled pore space. Zanatta et al (2010) found the highest fluxes of N 2 O-N during 45 days after soil management associated with high water-filled pore space and increased organic C and mineral N, which accounted for 30% of N 2 O-N emissions in a year. During two years of field experiment, Jantalia et al (2008) observed the highest fluxes of N 2 O-N after periods of high rainfall associated with mineral fertilization.…”

“…-and indirect ones -leaching, runoff, and atmospheric deposition (Cerri et al, 2009). Local assessment of GHG emissions from Brazilian agriculture systems have been reported (Carvalho et al, 2006;Metay et al, 2007;Jantalia et al, 2008;Zanatta et al, 2010;Cruvinel et al, 2011); however, the relative scarcity of data makes it difficult to assess the overall impact of irrigated common-bean under no-tillage on N 2 O-N and NH 3 -N fluxes in the Brazilian Cerrado.…”