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N2O emission from soil due to urine deposition by grazing cattle and potential mitigation

Texto completo
Autor(es):
Arlete Simões Barneze
Número total de Autores: 1
Tipo de documento: Dissertação de Mestrado
Imprenta: Piracicaba.
Instituição: Universidade de São Paulo (USP). Centro de Energia Nuclear na Agricultura
Data de defesa:
Membros da banca:
Carlos Clemente Cerri; Bruno José Rodrigues Alves; Helder Louvandini
Orientador: Carlos Clemente Cerri
Resumo

Grazing pasture is a major system of livestock production in many countries and it has been identified as an important source of N2O from urine deposition on soils. The aim of this study was to determinate the N2O emissions from soil after urine deposition and the emission factor, in addition, determine how temperature and water content of the soil influence these emissions. We also intended to study a potential of mitigation using nitrification inhibitors. Soil and gas samples were collected in traditional livestock areas in Brazil and UK to evaluate the N2O emission dynamics under field conditions. In addition, incubation experiments were conducted to evaluate how temperature and water content affect N2O emissions in the soil and to study the potential mitigation on N2O emission from the soil after urine application, using two distinct nitrification inhibitors. In the field experiment, the N2O emission factor for cattle urine was 0.20% of the applied urine N in Brazil and 0.66% for the UK conditions. The incubation experiments showed the N2O emissions after urine application are higher in soils with high moisture and high temperature. The nitrification inhibitor effectiveness was not statistically significant, however had shown some N2O emission absolute reductions among 6% to 33% comparing with urine only application on the soil. Various physical and biological factors can be influence the effectiveness of the products. It confirmed that urine deposition can contribute to N2O emission from the soil and the temperature and water content can markedly increase these emissions. The nitrification inhibitors have a potential mitigation effect since some decreased emissions of almost 40%. The results in this study are pioneers and can be used as a basis for more complex evaluations and to help with determining the carbon footprint of beef production worldwide (AU)

Processo FAPESP: 10/14455-1 - Emissão de N2O do solo devido à adição de urina de gado em sistema de pecuária extensiva
Beneficiário:Arlete Simões Barneze
Linha de fomento: Bolsas no Brasil - Mestrado