Perdas gasosas de nitrogênio em sistema de produção de arroz irrigado em várzea tropical

• Autor(a) principal: Carvalho, Glaucilene Duarte
• Data de Publicação: 2015
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tede/7143
• topic: Fluxos; Fator de emissão; Câmaras estáticas; Streams; Emission factor; Static cameras; CIENCIAS AGRARIAS::AGRONOMIA

The objective of this study was to characterize the dynamics of nitrous oxide flows and estimate the loss of nitrogen in the form of nitrous oxide and ammonia derived from nitrogen fertilization in rice cultivation in tropical lowland . The experiment was conducted in the experimental area of Embrapa Rice and Beans, at Palmital Farm, in the municipality of Goianira - Goiás, Brazil. The N2O flow soil alternated between positive (output) and negative (inflow) ranging between -83,67 and 470,84 μg N-N2O m-2 h-1; -168,01 to 113, 46 μg N-N2O m-2 h-1 and -103,54 to 290,08 μg N-N2O m-2 h-1 in the 2011/2012 season, off season and 2012/2013, respectively. N losses by volatilization from the use of nitrogen fertilizer, totaled 210 and 203 mg N-NH3 m-2, T1 and T2, respectively. In the off was, on average, 65,08 mg NNH3 m-2 and 2012/2013 amounted to 218,25; 244,80 e 233,78 mg N-NH3 m-2, at T0, T1 and T2, respectively. Actual values for emission factor for NH3-N and N-N2O were below (max. EF = 0.3%) than recommended by the IPCC.