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Registro Completo |
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Biblioteca(s): |
Embrapa Meio Ambiente. |
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Data corrente: |
02/10/2006 |
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Data da última atualização: |
20/09/2017 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
TIMM, L. C.; BARBOSA, E. P.; SOUZA, M. D. de; DYNIA, J. F.; REICHARD, K. |
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Afiliação: |
L. C. TIMM, CENA/USP; E. P. BARBOSA, IMECC/Unicamp; MANOEL DORNELAS DE SOUZA, CNPMA; J. F. DYNIA, CENA/USP; K. REICHARD, CENA/USP. |
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Título: |
State-space analysis of soil data: an approach based on space-varying regresion models. |
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Ano de publicação: |
2003 |
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Fonte/Imprenta: |
Scientia Agricola, Piracicaba, v. 60, n. 2, p. 371-376, 2003 |
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Idioma: |
Inglês |
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Conteúdo: |
The assessment of the relationship among soil properties (such as total nitrogen and organic carbon) taken along lines called transects is a subject of great interest in agricultural experimentation. This question has been usually approached through standard state-space methods by some authors in the soil science literature. Important limitations of the mentioned procedures used in practice are pointed out and discussed in this paper, specially those related to the model parameters, meaning and practical interpretation. In the standard state-space approach, based on an autoregressive structure, it does not present any parameters that express the variables relationship at the same point in space, but only at lagged points. Also, its model parameters (in the transition matrix) have a global meaning and not a local one, not expressing more directly the soil heterogeneity. Therefore, the objective here is to propose an alternative state-space approach, based on dynamic (space-varying parameters) regression models in order to avoid the mentioned drawbacks. Soil total nitrogen and soil organic carbon samples were collected on a Typic Haplustox. Samples were taken along a line (transect) located in the middle of two adjacent contour lines. The transect samples, totaling 97, were collected in the plow layer (0-0.20 m) at points spaced 2 meters appart. Results show the comparative advantages of the proposed method (based on an alternative state-space approach) in relation to the standard state-space analysis. Such advantages are related to a more adequate incorporation of soil heterogeneity along the spatial transect resulting in a better model fitting, and greater flexibility of the model's building process with an easier interpretability of the local model coefficients. MenosThe assessment of the relationship among soil properties (such as total nitrogen and organic carbon) taken along lines called transects is a subject of great interest in agricultural experimentation. This question has been usually approached through standard state-space methods by some authors in the soil science literature. Important limitations of the mentioned procedures used in practice are pointed out and discussed in this paper, specially those related to the model parameters, meaning and practical interpretation. In the standard state-space approach, based on an autoregressive structure, it does not present any parameters that express the variables relationship at the same point in space, but only at lagged points. Also, its model parameters (in the transition matrix) have a global meaning and not a local one, not expressing more directly the soil heterogeneity. Therefore, the objective here is to propose an alternative state-space approach, based on dynamic (space-varying parameters) regression models in order to avoid the mentioned drawbacks. Soil total nitrogen and soil organic carbon samples were collected on a Typic Haplustox. Samples were taken along a line (transect) located in the middle of two adjacent contour lines. The transect samples, totaling 97, were collected in the plow layer (0-0.20 m) at points spaced 2 meters appart. Results show the comparative advantages of the proposed method (based on an alternative state-space approach) in relation to the stan... Mostrar Tudo |
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Thesagro: |
Análise do solo; Modelo matemático; Química do solo. |
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Categoria do assunto: |
S Ciências Biológicas |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/163851/1/Timm-State-Space-6393.pdf
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Marc: |
LEADER 02407naa a2200205 a 4500
001 1015026
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008 2003 bl uuuu u00u1 u #d
100 1 $aTIMM, L. C.
245 $aState-space analysis of soil data$ban approach based on space-varying regresion models.$h[electronic resource]
260 $c2003
520 $aThe assessment of the relationship among soil properties (such as total nitrogen and organic carbon) taken along lines called transects is a subject of great interest in agricultural experimentation. This question has been usually approached through standard state-space methods by some authors in the soil science literature. Important limitations of the mentioned procedures used in practice are pointed out and discussed in this paper, specially those related to the model parameters, meaning and practical interpretation. In the standard state-space approach, based on an autoregressive structure, it does not present any parameters that express the variables relationship at the same point in space, but only at lagged points. Also, its model parameters (in the transition matrix) have a global meaning and not a local one, not expressing more directly the soil heterogeneity. Therefore, the objective here is to propose an alternative state-space approach, based on dynamic (space-varying parameters) regression models in order to avoid the mentioned drawbacks. Soil total nitrogen and soil organic carbon samples were collected on a Typic Haplustox. Samples were taken along a line (transect) located in the middle of two adjacent contour lines. The transect samples, totaling 97, were collected in the plow layer (0-0.20 m) at points spaced 2 meters appart. Results show the comparative advantages of the proposed method (based on an alternative state-space approach) in relation to the standard state-space analysis. Such advantages are related to a more adequate incorporation of soil heterogeneity along the spatial transect resulting in a better model fitting, and greater flexibility of the model's building process with an easier interpretability of the local model coefficients.
650 $aAnálise do solo
650 $aModelo matemático
650 $aQuímica do solo
700 1 $aBARBOSA, E. P.
700 1 $aSOUZA, M. D. de
700 1 $aDYNIA, J. F.
700 1 $aREICHARD, K.
773 $tScientia Agricola, Piracicaba$gv. 60, n. 2, p. 371-376, 2003
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Registro original: |
Embrapa Meio Ambiente (CNPMA) |
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| Registros recuperados : 200 | |
| 101. |  | BOEIRA, R. C.; BETTANIN, V. C.; MORAES, M. P. G. de; SOUZA, M. D. de. Potencial de utilização de resíduos orgânicos da região nordeste como fertilizantes. In: REUNIÃO BRASILEIRA DE FERTILIDADE DO SOLO E NUTRIÇÃO DE PLANTAS, 26.; REUNIÃO BRASILEIRA SOBRE MICORRIZAS, 10.; SIMPÓSIO BRASILEIRO DE MICROBIOLOGIA DO SOLO, 8.; REUNIÃO BRASILEIRA DE BIOLOGIA DO SOLO, 5., 2004, Lages. Fertbio 2004. Lages: SBCS, 2004., 2004 1 CD-ROM| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Meio Ambiente. |
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| 102. | | BOEIRA, R. C.; SOUZA, M. D. de; HERMES, L. C.; ABAKERLI, R. B.; FAY, E. F. Procedimento para linearização de isotermas de adsorção de clomazone. In: CONGRESO VIRTUAL IBEROAMERICANO SOBRE GESTIÓN DE CALIDAD EN LABORATORIOS, 3., 2005, Madrid. Libro de comunicaciones: tomo I. Madrid: Ministério da Agricultura, Pesca y Alimentación, 2005. p. 255-259.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Meio Ambiente. |
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| 103. | | BOEIRA, R. C.; SOUZA, M. D. de; HERMES, L. C.; ABAKERLI, R. B.; FAY, E. F. Procedimento para linearização de isotermas de adsorção de clomazone. In: CONGRESO VIRTUAL IBEROAMERICANO SOBRE GESTIÓN DE CALIDAD EN LABORATORIOS, 3., 2005, Madrid. Libro de comunicaciones: tomo I. Madrid: Ministério da Agricultura, Pesca y Alimentación, 2005.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Meio Ambiente. |
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| 105. | | BOEIRA, R. C.; SKORUPA, L. A.; SOUZA, M. D. de; NICOLELLA, G. Recuperação de áreas degradadas com lodo de esgoto e espécies florestais. In: CONGRESSO BRASILEIRO DE AGROECOLOGIA, 1; SEMINÁRIO INTERNACIONAL SOBRE AGROECOLOGIA, 4; SEMINÁRIO ESTADUAL SOBRE AGROECOLOGIA, 5., 2003, Porto Alegre. Anais.. Porto Alegre: EMATER/RS-ASCAR, 2003. 5 p.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Meio Ambiente. |
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| 110. | | PEREIRA, E. T. L.; LACERDA, M. C.; SOUZA, M. D. de; ZAGO, K. F. O.; NASCENTE, A. S. Adubação nitrogenada de cobertura em linhagem de feijão-comum. In: ENCONTRO NACIONAL DE PLANTIO DIRETO NA PALHA, 15., 2016, Goiânia. Palha, ambiente e renda: resumos apresentados. Santo Antônio de Goiás: Embrapa Arroz e Feijão, 2016. p. 118. (Embrapa Arroz e Feijão. Documentos, 313).| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Arroz e Feijão. |
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| 118. | | BOEIRA, R. C.; SOUZA, M. D. de; MAIA, A. de H. N.; FERRACINI, V. L.; GOMES, M. A. F. Adsorption and desorption of the herbicides diuron and tebuthiuron in soils in the Guarani Aquifer recharge areas in the region of Ribeirão Preto, SP. In: GOMES, M. A. F. (Ed.). Agricultural use of the Guarani Aquifer recharge areas in Brazil: implications for groundwater and proposed agri-environmental schemes. Brasília, DF: Embrapa, 2012. pt. 2, p. 105-125. 1 e-book no formato epub.| Tipo: Capítulo em Livro Técnico-Científico |
| Biblioteca(s): Embrapa Meio Ambiente. |
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| 119. | | GOMES, M. A. F.; FILIZOLA, H. F.; SOUZA, M. D. de; FERRACINI, V. L.; QUEIROZ, S. C. do N. de. Amostragem de solos para análise de agrotóxicos. In: FILIZOLA, H. F.; GOMES, M. A. F.; SOUZA, M. D. de. Manual de procedimentos de coleta de amostras em áreas agrícolas para análise da qualidade ambiental: solo, água e sedimentos. Jaguariúna: Embrapa Meio Ambiente, 2006. p. 53-56.| Tipo: Capítulo em Livro Técnico-Científico |
| Biblioteca(s): Embrapa Meio Ambiente. |
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| 120. | | PEREIRA, E. T. L.; ZAGO, K. F. O.; SOUZA, M. D. de; PEREIRA, L. D.; LACERDA, M. C. Arroz de terras altas consorciado com Urochloa brizantha cv. Piatã. In: SEMINÁRIO JOVENS TALENTOS, 10., 2016, Santo Antônio de Goiás. Coletânea dos resumos apresentados. Santo Antônio de Goiás: Embrapa Arroz e Feijão, 2016. p. 19. (Embrapa Arroz e Feijão. Documentos, 311).| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Arroz e Feijão. |
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| Registros recuperados : 200 | |
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| Nenhum registro encontrado para a expressão de busca informada. |
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