Are CH4, CO2, and N2O Emissions from Soil Affected by the Sources and Doses of N in Warm-Season Pasture?

Autor(es)

Correa, Darlena Caroline da Cruz ^[1] ; Cardoso, Abmael da Silva ^[1] ; Ferreira, Mariane Rodrigues ^[1] ; Siniscalchi, Debora ^[1] ; Toniello, Ariana Desie ^[1] ; de Lima, Gilmar Cotrin ^[1] ; Reis, Ricardo Andrade ^[1] ; Ruggieri, Ana Claudia ^[1]

Afiliação do(s) autor(es)

^[1] UNESP Univ Estadual Paulista, Fac Ciencias Agr Vet, Dept Zootecnia, BR-14884900 Jaboticabal, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ATMOSPHERE; v. 12, n. 6 JUN 2021.
• Citações Web of Science: 0

Resumo

The intensification of pasture production has increased the use of N fertilizers-a practice that can alter soil greenhouse gas (GHG) fluxes. The objective of the present study was to evaluate the fluxes of CH4, CO2, and N2O in the soil of Urochloa brizantha `Marandu' pastures fertilized with different sources and doses of N. Two field experiments were conducted to evaluate GHG fluxes following N fertilization with urea, ammonium nitrate, and ammonium sulfate at doses of 0, 90, 180, and 270 kg N ha(-1). GHG fluxes were quantified using the static chamber technique and gas chromatography. In both experiments, the sources and doses of N did not significantly affect cumulative GHG emissions, while N fertilization significantly affected cumulative N2O and CO2 emissions compared to the control treatment. The N2O emission factor following fertilization with urea, ammonium nitrate, and ammonium sulfate was lower than the United Nations' Intergovernmental Panel on Climate Change standard (0.35%, 0.24%, and 0.21%, respectively, with fractionation fertilization and 1.00%, 0.83%, and 1.03%, respectively, with single fertilization). These findings are important for integrating national inventories and improving GHG estimation in tropical regions. (AU)

• Processo FAPESP: 17/20279-0 - Emissão de gases de efeito estufa de excretas bovinas de forrageiras C3 e gramíneas C4 em pastos tropicais
• Beneficiário: Rodolfo Nussio Lumasini
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 15/16631-5 - Estratégias de manejo para redução de impactos ambientais em sistemas de produção de bovinos de corte
• Beneficiário: Ricardo Andrade Reis
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático
• Processo FAPESP: 17/11274-5 - Decomposição de serrapilheira e emissão de gases de efeito estufa em pastos de Brachiaria adubados com doses crescentes de nitrogênio
• Beneficiário: Abmael da Silva Cardoso
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 17/02914-0 - Perdas de nitrogênio em pastos de braquiária adubados com doses crescentes de nitrogênio
• Beneficiário: Débora Siniscalchi
• Modalidade de apoio: Bolsas no Brasil - Programa Capacitação - Treinamento Técnico