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Registro Completo |
Biblioteca(s): |
Embrapa Semiárido. |
Data corrente: |
18/09/2013 |
Data da última atualização: |
18/09/2013 |
Autoria: |
VIDAL PÉREZ, D.; ALCANTARA, S.; ARRUDA, R. J.; MENEGHELLI, N. A. |
Título: |
Comparing two methods for soil carbon and nitrogen determination using selected Brazilian soils. |
Ano de publicação: |
2001 |
Fonte/Imprenta: |
Communications in Soil Science and Plant Analysis, v. 32, N. 1/2, p. 295-309, 2001. |
Idioma: |
Inglês |
Conteúdo: |
Considering the increasing need for reliable soil carbon (C) and nitrogen (N) determinations, 19 Brazilian soil samples were selected to compare the results of two methods (a) a modified dichromate wet digestion and Kjeldahl that has been in use by Embrapa in most of Brazilian soil surveys (Embrapa's method), and (b) an automated technique based on dry combustion (Perkin-Elmer 2.400 Series II?CHN Mode). Considering that the last method is very much influenced by sample size, two weights were tested (10 and 100 mg). The influence of two particle sizes for both methods (crushed and sieved to pass a 0.177-mm mesh) was also tested. A simple linear regression with the confidence limits for the intercept and slope were used to compare methods. Precision was evaluated by the coefficient of variation (C.V.). The results showed that simple crushing is inadequate for performance analysis by dry combustion mainly for small samples (10 mg), where the precision is also low (19.77% for N and 9.41% for C). The dry combustion method is significantly affected by the use of small samples (10 mg), mainly for N analysis. For finely ground samples (< 0.177 mm), a comparison of the results obtained by dry combustion (100 mg weight sample) and by Embrapa's method showed a significant 1:1 relation. Thus the use of correction factor is not necessary. |
Palavras-Chave: |
Natural resource; Recursos naturais. |
Thesagro: |
Carbono; Nitrogênio; Solo. |
Thesaurus Nal: |
Soil. |
Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
Marc: |
LEADER 02033naa a2200229 a 4500 001 1966491 005 2013-09-18 008 2001 bl uuuu u00u1 u #d 100 1 $aVIDAL PÉREZ, D. 245 $aComparing two methods for soil carbon and nitrogen determination using selected Brazilian soils.$h[electronic resource] 260 $c2001 520 $aConsidering the increasing need for reliable soil carbon (C) and nitrogen (N) determinations, 19 Brazilian soil samples were selected to compare the results of two methods (a) a modified dichromate wet digestion and Kjeldahl that has been in use by Embrapa in most of Brazilian soil surveys (Embrapa's method), and (b) an automated technique based on dry combustion (Perkin-Elmer 2.400 Series II?CHN Mode). Considering that the last method is very much influenced by sample size, two weights were tested (10 and 100 mg). The influence of two particle sizes for both methods (crushed and sieved to pass a 0.177-mm mesh) was also tested. A simple linear regression with the confidence limits for the intercept and slope were used to compare methods. Precision was evaluated by the coefficient of variation (C.V.). The results showed that simple crushing is inadequate for performance analysis by dry combustion mainly for small samples (10 mg), where the precision is also low (19.77% for N and 9.41% for C). The dry combustion method is significantly affected by the use of small samples (10 mg), mainly for N analysis. For finely ground samples (< 0.177 mm), a comparison of the results obtained by dry combustion (100 mg weight sample) and by Embrapa's method showed a significant 1:1 relation. Thus the use of correction factor is not necessary. 650 $aSoil 650 $aCarbono 650 $aNitrogênio 650 $aSolo 653 $aNatural resource 653 $aRecursos naturais 700 1 $aALCANTARA, S. 700 1 $aARRUDA, R. J. 700 1 $aMENEGHELLI, N. A. 773 $tCommunications in Soil Science and Plant Analysis$gv. 32, N. 1/2, p. 295-309, 2001.
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Biblioteca(s): |
Embrapa Instrumentação. |
Data corrente: |
19/01/2015 |
Data da última atualização: |
28/08/2018 |
Tipo da produção científica: |
Artigo em Anais de Congresso |
Autoria: |
GALHARTE, C. A. VILLELA, J. M.; CRESTANA, S. |
Afiliação: |
SILVIO CRESTANA, CNPDIA. |
Título: |
Simulação do escorrimento superficial produção de sedimentos na microbacia hidrográfica do Ribeirão das Guabirobas - SP. |
Ano de publicação: |
2014 |
Fonte/Imprenta: |
In: SIMPÓSIO NACIONAL DE INSTRUMENTAÇÃO AGROPECUÁRIA, 2014, São Carlos, SP Anais do SIAGRO: ciência, inovação e mercado 2014. São Carlos, SP: Embrapa Instrumentação, 2014. p. 633-636. Editores: Carlos Manoel Pedro Vaz, Débora Marcondes Bastos Pereira Milori, Silvio Crestana. |
ISSN: |
2358-9132 |
Idioma: |
Português |
Palavras-Chave: |
Cana-de-açúcar; CLUE-S; Escorrimento superficial; Instrumentação evento; Produção de sedimentos; SWAT. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/115846/1/633siagro-2014-print01.pdf
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Marc: |
LEADER 00899nam a2200193 a 4500 001 2005928 005 2018-08-28 008 2014 bl uuuu u00u1 u #d 022 $a2358-9132 100 1 $aGALHARTE, C. A. VILLELA, J. M. 245 $aSimulação do escorrimento superficial produção de sedimentos na microbacia hidrográfica do Ribeirão das Guabirobas - SP.$h[electronic resource] 260 $aIn: SIMPÓSIO NACIONAL DE INSTRUMENTAÇÃO AGROPECUÁRIA, 2014, São Carlos, SP Anais do SIAGRO: ciência, inovação e mercado 2014. São Carlos, SP: Embrapa Instrumentação, 2014. p. 633-636. Editores: Carlos Manoel Pedro Vaz, Débora Marcondes Bastos Pereira Milori, Silvio Crestana.$c2014 653 $aCana-de-açúcar 653 $aCLUE-S 653 $aEscorrimento superficial 653 $aInstrumentação evento 653 $aProdução de sedimentos 653 $aSWAT 700 1 $aCRESTANA, S.
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