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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Perdas gasosas de nitrogênio em sistema de produção de arroz irrigado em várzea tropical / Gaseosus nitrogen losses in rice production system in tropical lowland

Carvalho, Glaucilene Duarte 31 March 2015 (has links)
Submitted by Cássia Santos (cassia.bcufg@gmail.com) on 2017-04-13T13:44:36Z No. of bitstreams: 2 Tese - Glaucilene Duarte Carvalho - 2015.pdf: 1802347 bytes, checksum: f9637cc5acb406196d502d1d9c90cffc (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2017-04-13T14:15:11Z (GMT) No. of bitstreams: 2 Tese - Glaucilene Duarte Carvalho - 2015.pdf: 1802347 bytes, checksum: f9637cc5acb406196d502d1d9c90cffc (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Made available in DSpace on 2017-04-13T14:15:11Z (GMT). No. of bitstreams: 2 Tese - Glaucilene Duarte Carvalho - 2015.pdf: 1802347 bytes, checksum: f9637cc5acb406196d502d1d9c90cffc (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2015-03-31 / Fundação de Amparo à Pesquisa do Estado de Goiás - FAPEG / 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. / O objetivo deste estudo foi caracterizar a dinâmica dos fluxos de óxido nitroso e estimar a perda de nitrogênio, na forma de óxido nitroso e amônia, derivada da fertilização nitrogenada em cultivo de arroz irrigado em várzea tropical. O experimento foi conduzido na área experimental da Embrapa Arroz e Feijão, na Fazenda Palmital, no município de Goianira- Goiás, Brasil. Os fluxos de N2O do solo alternaram entre positivos (emissão) e negativos (influxo), variando entre -83,67 e 470,84 μg N-N2O m-2 h-1; -168,01 a 113, 46 μg N-N2O m-2 h- 1 e -103,54 a 290,08 μg N-N2O m-2 h-1 na safra 2011/2012, entressafra e 2012/2013, respectivamente. As perdas de N por volatilização de amônia decorrentes da utilização de fertilizante nitrogenado, totalizaram 210 mg m-2 e 203 mg m-2 de N-NH3, em T1 e T2, respectivamente. Na entressafra foi, em média, 65,08 mg m-2 de N-NH3 e 2012/2013 totalizaram 218,25 mg m-2, 244,80 mg m-2 e 233,78 de N-NH3, em T0, T1 e T2, respectivamente. Os valores encontrados de fator de emissão para N-NH3 e N-N2O foram abaixo (max. FE = 0,3 %) do preconizado pelo IPCC.

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