|
|
| Acesso ao texto completo restrito à biblioteca da Embrapa Soja. Para informações adicionais entre em contato com valeria.cardoso@embrapa.br. |
Registro Completo |
Biblioteca(s): |
Embrapa Arroz e Feijão; Embrapa Soja. |
Data corrente: |
15/08/2006 |
Data da última atualização: |
14/05/2022 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
MADARI, B. E.; REEVES III, J. B.; MACHADO, P. L. O. A.; GUIMARÃES, C. M.; TORRES, E.; MCCARTY, G. W. |
Afiliação: |
BEATA EMOKE MADARI, CNPAF; JAMES B. REEVES III, USDA; PEDRO LUIZ OLIVEIRA DE A MACHADO, CNPAF; CLEBER MORAIS GUIMARAES, CNPAF; ELENO TORRES, CNPSO; GREGORY W. MCCARTY, USDA. |
Título: |
Mid- and near-infrared spectroscopic assessment of soil compositional parameters and structural indices in two Ferralsols. |
Ano de publicação: |
2006 |
Fonte/Imprenta: |
Geoderma, v. 136, n. 1/2, p. 245-259, Dec. 2006. |
Idioma: |
Inglês |
Conteúdo: |
Bulk soil samples (BS) (n=120) from long-term tillage experiments and areas covered by secondary natural forest were collected in the Brazilian savanna region (Cerrado) at Santo Antônio de Goiás, and southern Atlantic forest region at Londrina. Bulk soils were separated into 8 aggregate size fractions (ASF) by wet sieving (n=700). Bulk soil samples (BS) and ASF were analyzed for total C, N by dry combustion. BS were also analyzed for sand, silt, and clay by densitometry, and several measures of soil aggregation were determined. All samples were scanned in the mid- and near-infrared (Mid-IR, NIR) by diffuse reflectance of ground, non-KBr diluted samples using a Digilab FTS-7000 FTIR spectrometer equipped with a Pike Auto-Diff auto-sampler. Quantitative calibrations for the various analytes were performed separately for the original set of 120 BS samples and the set of 700 ASF samples using partial least squares regression (PLSR). Results for the set of 120 BS for total C and N were excellent using either spectral range with R2>0.97, except for C by Mid-IR (R2=0.93). Similar results were obtained for determinations of sand and clay (R2>0.94). Silt, determined by difference (100%-%sand-%clay), gave much lower R2 (0.80 and 0.63 for Mid-IR and NIR, respectively). For aggregation indices, R2 of ~0.80 were achieved in the Mid-IR, NIR results were not as good (R2<0.67). Efforts with the 700 ASF samples resulted in R2 of 0.98 and 0.96 for C, and 0.96 and 0.97 for N, for Mid-IR and NIR calibrations, respectively. Calibration efforts to determine the values for the set of 700 ASF samples using set of 120 BS from which they were fractionated gave R2=0.90 and 0.87 in the Mid-IR and NIR, respectively, when 5% of the ASF were added to the set of 120 BS. Spectral discrimination of sample source was easily and very accurately determined for all data sets examined. MenosBulk soil samples (BS) (n=120) from long-term tillage experiments and areas covered by secondary natural forest were collected in the Brazilian savanna region (Cerrado) at Santo Antônio de Goiás, and southern Atlantic forest region at Londrina. Bulk soils were separated into 8 aggregate size fractions (ASF) by wet sieving (n=700). Bulk soil samples (BS) and ASF were analyzed for total C, N by dry combustion. BS were also analyzed for sand, silt, and clay by densitometry, and several measures of soil aggregation were determined. All samples were scanned in the mid- and near-infrared (Mid-IR, NIR) by diffuse reflectance of ground, non-KBr diluted samples using a Digilab FTS-7000 FTIR spectrometer equipped with a Pike Auto-Diff auto-sampler. Quantitative calibrations for the various analytes were performed separately for the original set of 120 BS samples and the set of 700 ASF samples using partial least squares regression (PLSR). Results for the set of 120 BS for total C and N were excellent using either spectral range with R2>0.97, except for C by Mid-IR (R2=0.93). Similar results were obtained for determinations of sand and clay (R2>0.94). Silt, determined by difference (100%-%sand-%clay), gave much lower R2 (0.80 and 0.63 for Mid-IR and NIR, respectively). For aggregation indices, R2 of ~0.80 were achieved in the Mid-IR, NIR results were not as good (R2<0.67). Efforts with the 700 ASF samples resulted in R2 of 0.98 and 0.96 for C, and 0.96 and 0.97 for N, for Mid-IR and NI... Mostrar Tudo |
Palavras-Chave: |
Mid-infrared; Near-infrared; PLSR. |
Thesagro: |
Carbono; Espectrometria; Solo. |
Thesaurus Nal: |
Carbon; Chemometrics; Near-infrared spectroscopy; soil; spectroscopy. |
Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra X Pesquisa, Tecnologia e Engenharia |
Marc: |
LEADER 02768naa a2200313 a 4500 001 1205174 005 2022-05-14 008 2006 bl uuuu u00u1 u #d 100 1 $aMADARI, B. E. 245 $aMid- and near-infrared spectroscopic assessment of soil compositional parameters and structural indices in two Ferralsols.$h[electronic resource] 260 $c2006 520 $aBulk soil samples (BS) (n=120) from long-term tillage experiments and areas covered by secondary natural forest were collected in the Brazilian savanna region (Cerrado) at Santo Antônio de Goiás, and southern Atlantic forest region at Londrina. Bulk soils were separated into 8 aggregate size fractions (ASF) by wet sieving (n=700). Bulk soil samples (BS) and ASF were analyzed for total C, N by dry combustion. BS were also analyzed for sand, silt, and clay by densitometry, and several measures of soil aggregation were determined. All samples were scanned in the mid- and near-infrared (Mid-IR, NIR) by diffuse reflectance of ground, non-KBr diluted samples using a Digilab FTS-7000 FTIR spectrometer equipped with a Pike Auto-Diff auto-sampler. Quantitative calibrations for the various analytes were performed separately for the original set of 120 BS samples and the set of 700 ASF samples using partial least squares regression (PLSR). Results for the set of 120 BS for total C and N were excellent using either spectral range with R2>0.97, except for C by Mid-IR (R2=0.93). Similar results were obtained for determinations of sand and clay (R2>0.94). Silt, determined by difference (100%-%sand-%clay), gave much lower R2 (0.80 and 0.63 for Mid-IR and NIR, respectively). For aggregation indices, R2 of ~0.80 were achieved in the Mid-IR, NIR results were not as good (R2<0.67). Efforts with the 700 ASF samples resulted in R2 of 0.98 and 0.96 for C, and 0.96 and 0.97 for N, for Mid-IR and NIR calibrations, respectively. Calibration efforts to determine the values for the set of 700 ASF samples using set of 120 BS from which they were fractionated gave R2=0.90 and 0.87 in the Mid-IR and NIR, respectively, when 5% of the ASF were added to the set of 120 BS. Spectral discrimination of sample source was easily and very accurately determined for all data sets examined. 650 $aCarbon 650 $aChemometrics 650 $aNear-infrared spectroscopy 650 $asoil 650 $aspectroscopy 650 $aCarbono 650 $aEspectrometria 650 $aSolo 653 $aMid-infrared 653 $aNear-infrared 653 $aPLSR 700 1 $aREEVES III, J. B. 700 1 $aMACHADO, P. L. O. A. 700 1 $aGUIMARÃES, C. M. 700 1 $aTORRES, E. 700 1 $aMCCARTY, G. W. 773 $tGeoderma$gv. 136, n. 1/2, p. 245-259, Dec. 2006.
Download
Esconder MarcMostrar Marc Completo |
Registro original: |
Embrapa Arroz e Feijão (CNPAF) |
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
| Acesso ao texto completo restrito à biblioteca da Embrapa Cerrados. Para informações adicionais entre em contato com cpac.biblioteca@embrapa.br. |
Registro Completo
Biblioteca(s): |
Embrapa Cerrados. |
Data corrente: |
02/02/2008 |
Data da última atualização: |
02/02/2008 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Circulação/Nível: |
Internacional - C |
Autoria: |
ABREU, U. G. P.; SANTOS, S. A.; SERENO, J. R. B.; MCMANUS, C. |
Afiliação: |
U. G. P. Abreu, CPAP; S. A. Santos, CPAP; José Robson Bezerra Sereno, CPAC; C. McManus, UnB. |
Título: |
Caracterização fenotípica e genética da precocidade sexual do bovino pantaneiro. |
Ano de publicação: |
2007 |
Fonte/Imprenta: |
Archivos de Zootecnia, Córdoba, v. 56, supl. 1, p. 627-631, 2007. |
Idioma: |
Português |
Palavras-Chave: |
Herdabilidade. |
Thesagro: |
Gado; Idade; Parto. |
Categoria do assunto: |
-- |
Marc: |
LEADER 00545naa a2200193 a 4500 001 1559216 005 2008-02-02 008 2007 bl --- 0-- u #d 100 1 $aABREU, U. G. P. 245 $aCaracterização fenotípica e genética da precocidade sexual do bovino pantaneiro. 260 $c2007 650 $aGado 650 $aIdade 650 $aParto 653 $aHerdabilidade 700 1 $aSANTOS, S. A. 700 1 $aSERENO, J. R. B. 700 1 $aMCMANUS, C. 773 $tArchivos de Zootecnia, Córdoba$gv. 56, supl. 1, p. 627-631, 2007.
Download
Esconder MarcMostrar Marc Completo |
Registro original: |
Embrapa Cerrados (CPAC) |
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
Fechar
|
Expressão de busca inválida. Verifique!!! |
|
|