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Registro Completo |
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Biblioteca(s): |
Embrapa Solos. |
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Data corrente: |
22/11/2002 |
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Data da última atualização: |
22/11/2002 |
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Autoria: |
TEDESCO, M. J. |
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Título: |
I. Analysis of 15N: evaluation of sample preparation and analysis methology with an optical 15N analyzer. II. The fate of urea fertilizer in some soils of Rio Grande do Sul, Brazil. |
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Ano de publicação: |
1972 |
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Fonte/Imprenta: |
s.l.: University of Wisconsin, 1972. |
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Páginas: |
127p. |
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Idioma: |
Inglês |
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Notas: |
Ph.D. Thesis. |
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Conteúdo: |
A comercially available optical 15N analyzer and sample preparation unit were evaluated with respect to ease of use, sample size, reproducibility and accuracy. The sample prep unit, which utilized a Dumas combustion approach to produce N2, was modified extensively and the hypobromite oxidation method for N2 production was adopted. Instrumentation problems and source of error include monlinear gain settings, baseline determination, overlapping peak heights and monlinear gain settings, baseline determination, overlapping peak heights and monlinearity of the standard curve. Problems in the sample method adopted were limited to memory in the discharge tube. This was reduced by prolonged heating of the tubes at 700 oC. Minimum sample size is about 10 ug of N. In the normal abundance to 5 atom % 15N range, the methid gave 0.01 confidence interval values of +- 0.031 atom % 15N. The analyzer was simple, rapid and free of downtime relative to most mass spectrometers. Transformation of pelleted 2.92 atmo % 15N urea fertilizer when applied 2 cm from the surface at the rate of 200 ppm in four acid Brazilian soils was studied. Each experimental unit was enclosed in a plexiglass chamber with controlled aeration, allowing determination of the NH3 and NO2 volatilized. The effects of cropping to ryegrass and liming were evaluated. Fertilizer N volatization losse as NH3 and NO2 could account at the most for only 2% of the N added. While no relationship was observed for NH3 volatilized, NO2 collected was greater for the ............. MenosA comercially available optical 15N analyzer and sample preparation unit were evaluated with respect to ease of use, sample size, reproducibility and accuracy. The sample prep unit, which utilized a Dumas combustion approach to produce N2, was modified extensively and the hypobromite oxidation method for N2 production was adopted. Instrumentation problems and source of error include monlinear gain settings, baseline determination, overlapping peak heights and monlinear gain settings, baseline determination, overlapping peak heights and monlinearity of the standard curve. Problems in the sample method adopted were limited to memory in the discharge tube. This was reduced by prolonged heating of the tubes at 700 oC. Minimum sample size is about 10 ug of N. In the normal abundance to 5 atom % 15N range, the methid gave 0.01 confidence interval values of +- 0.031 atom % 15N. The analyzer was simple, rapid and free of downtime relative to most mass spectrometers. Transformation of pelleted 2.92 atmo % 15N urea fertilizer when applied 2 cm from the surface at the rate of 200 ppm in four acid Brazilian soils was studied. Each experimental unit was enclosed in a plexiglass chamber with controlled aeration, allowing determination of the NH3 and NO2 volatilized. The effects of cropping to ryegrass and liming were evaluated. Fertilizer N volatization losse as NH3 and NO2 could account at the most for only 2% of the N added. While no relationship was observed for NH3 volatilized, NO2 co... Mostrar Tudo |
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Categoria do assunto: |
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Marc: |
LEADER 02012nam a2200133 a 4500
001 1331511
005 2002-11-22
008 1972 bl uuuu m 00u1 u #d
100 1 $aTEDESCO, M. J.
245 $aI. Analysis of 15N$bevaluation of sample preparation and analysis methology with an optical 15N analyzer. II. The fate of urea fertilizer in some soils of Rio Grande do Sul, Brazil.
260 $as.l.: University of Wisconsin$c1972
300 $a127p.
500 $aPh.D. Thesis.
520 $aA comercially available optical 15N analyzer and sample preparation unit were evaluated with respect to ease of use, sample size, reproducibility and accuracy. The sample prep unit, which utilized a Dumas combustion approach to produce N2, was modified extensively and the hypobromite oxidation method for N2 production was adopted. Instrumentation problems and source of error include monlinear gain settings, baseline determination, overlapping peak heights and monlinear gain settings, baseline determination, overlapping peak heights and monlinearity of the standard curve. Problems in the sample method adopted were limited to memory in the discharge tube. This was reduced by prolonged heating of the tubes at 700 oC. Minimum sample size is about 10 ug of N. In the normal abundance to 5 atom % 15N range, the methid gave 0.01 confidence interval values of +- 0.031 atom % 15N. The analyzer was simple, rapid and free of downtime relative to most mass spectrometers. Transformation of pelleted 2.92 atmo % 15N urea fertilizer when applied 2 cm from the surface at the rate of 200 ppm in four acid Brazilian soils was studied. Each experimental unit was enclosed in a plexiglass chamber with controlled aeration, allowing determination of the NH3 and NO2 volatilized. The effects of cropping to ryegrass and liming were evaluated. Fertilizer N volatization losse as NH3 and NO2 could account at the most for only 2% of the N added. While no relationship was observed for NH3 volatilized, NO2 collected was greater for the .............
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Registro original: |
Embrapa Solos (CNPS) |
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| Registros recuperados : 12 | |
| 2. |  | MIOLA, G. R.; TEDESCO, M. J.; BISSANI, C. A.; GIANELLO, C.; CAMARGO, F. A. de O. Avaliação da disponibilidade de fósforo no solo para a cultura do milho. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 34, n. 5, p. 813-19, maio 1999 Título em inglês: Assessment of soil phosphorus availability to corn.| Biblioteca(s): Embrapa Unidades Centrais. |
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| 5. | | QUADRO, M. S.; ANDREAZZA, R.; TEDESCO, M. J.; GIANELO, C.; BARCELOS, A. A.; BORTOLON, L. Teores de cromo ligados aos óxidos de ferro em áreas de descarte de lodo de curtume. Engenharia Sanitaria e Ambiental, n. 23, n. 1, p. 63-67, jan./fev. 2018.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 2 |
| Biblioteca(s): Embrapa Pesca e Aquicultura. |
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| 6. | | BOARETTO, A. E; CHITOLINA, J. C.; RAIJ, B. van; SILVA, F. C. da; TEDESCO, M. J.; CARMO, C. A. F. de S. do. Amostragem, acondicionamento e preparação das amostras de plantas para análise química. In: SILVA, F. C. da (org.). Manual de análises químicas de solos, plantas e fertilizantes. Brasília, DF: Embrapa Comunicação para Transferência de Tecnologia; Rio de Janeiro: Embrapa Solos; Campinas: Embrapa Informática Agropecuária, 1999. cap. 2, p. 49-73.| Tipo: Capítulo em Livro Técnico-Científico |
| Biblioteca(s): Embrapa Solos. |
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| 7. | | BOARETTO, A. E.; RAIJ, B. van; SILVA, F. C. da; CHITOLINA, J. C.; TEDESCO, M. J.; CARMO, C. A. F. S. do. Amostragem, acondicionamento e preparo de amostras de plantas para análise química. In: SILVA, F. C. da (ed.). Manual de análises químicas de solos, plantas e fertilizantes. 2. ed. rev. e ampl. Brasília, DF: Embrapa Informação Tecnológica; Rio de Janeiro: Embrapa Solos, 2009. pt. 1, cap. 2, p. 59-85.| Tipo: Capítulo em Livro Técnico-Científico |
| Biblioteca(s): Embrapa Agricultura Digital. |
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| 9. | | TEDESCO, M. J.; SILVA, L. M. C.; GIANELLO, C.; HIGA, R. H.; SILVA, F. C. da; MASSRUHA, S. M. F. S. Infra-estrutura, geracao e gerenciamento da informacao laboratorial. In: SILVA, F.C. da. Manual de analises quimicas de solos, plantas e fertilizantes. Brasilia: Embrapa Comunicacao para Transferencia de Tecnologia / Rio de Janeiro: Embrapa Solos / Campinas: Embrapa Informatica Agropecuaria, 1999. p.317-369.| Biblioteca(s): Embrapa Solos. |
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| 10. | | TEDESCO, M. J.; SANTOS, A. D. dos; GIANELLO, C.; SILVA, F. C. da; CUNHA, L. M. S.; HIGA, R. H.; MASSRUHÁ, S. M. F. S. Infra-estrutura laboratorial, gerenciamento de laboratório e automação da informação. In: SILVA, F. C. da (ed.). Manual de análises químicas de solos, plantas e fertilizantes. 2. ed. rev. e ampl. Brasília, DF: Embrapa Informação Tecnológica; Rio de Janeiro: Embrapa Solos, 2009. pt. 2, cap. 2, p. 561-627.| Tipo: Capítulo em Livro Técnico-Científico |
| Biblioteca(s): Embrapa Agricultura Digital. |
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| 11. | | SILVA, F. C. da; EIRA, P. A. da; RAIJ, B. van; SILVA, C. A.; ABREU, C. A. de; GIANELLO, C.; PEREZ, D. V.; QUAGGIO, J. A.; TEDESCO, M. J.; ABREU, M. F. de; BARRETO, W. de O. Análises químicas para avaliação da fertilidade do solo. In: SILVA, F. C. da (org.). Manual de análises químicas de solos, plantas e fertilizantes. Brasília, DF : Embrapa Comunicação para Transferência de Tecnologia; Rio de Janeiro: Embrapa Solos; Campinas: Embrapa Informática Agropecuária, 1999. cap. 3, p. 75-169.| Tipo: Capítulo em Livro Técnico-Científico |
| Biblioteca(s): Embrapa Solos. |
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| 12. | | SILVA, F. C. da; ABREU, M. F. de; PEREZ, D. V.; EIRA, P. A. da; ABREU, C. A. de; RAIJ, B. Van; GIANELLO, C.; COELHO, A. M.; QUAGGIO, J. A.; TEDESCO, M. J.; SILVA, C. A.; BARRETO, W. de O. Métodos de análises químicas para avaliação da fertilidade do solo. In: SILVA, F. C. da (ed.). Manual de análises químicas de solos, plantas e fertilizantes. 2. ed. rev. e ampl. Brasília, DF: Embrapa Informação Tecnológica; Rio de Janeiro: Embrapa Solos, 2009. pt. 2, cap. 1, p. 107-189.| Tipo: Capítulo em Livro Técnico-Científico |
| Biblioteca(s): Embrapa Agricultura Digital; Embrapa Milho e Sorgo; Embrapa Solos. |
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| Registros recuperados : 12 | |
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| Nenhum registro encontrado para a expressão de busca informada. |
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