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Registro Completo |
Biblioteca(s): |
Embrapa Meio Ambiente. |
Data corrente: |
25/06/2007 |
Data da última atualização: |
14/07/2017 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
SCHEPERS A. R.; SHANAHAN, J. F.; LIEBIG, M. A.; SCHEPERS, J. S.; JOHNSON, S. H.; LUCHIARI JUNIOR, A. |
Afiliação: |
AARON R. SCHEPERS, USDA/ARS; JOHN F. SHANAHAN, USDA/ARS; MARK A. LIEBIG, USDA/ARS; JAMES S. SCHEPERS, USDA/ARS; SVEN H. JOHNSON, USDA/ARS; ARIOVALDO LUCHIARI JUNIOR, CNPTIA. |
Título: |
Appropriateness of management zones for characterizing spatial variability of soil properties and irrigated corn yields across years. |
Ano de publicação: |
2004 |
Fonte/Imprenta: |
Agronomy Journal, Madison, v. 96, n.1, p. 195-203, 2004. |
Idioma: |
Inglês |
Conteúdo: |
Recent precision-agriculture research has focused on use of management zones (MZ) as a method for variable application of inputs like N. The objectives of this study were to determine (i) if landscape attributes could be aggregated into MZ that characterize spatial variation in soil chemical properties and corn yields and (ii) if temporal variability affects expression of yield spatial variability. This work was conducted on an irrigated cornfield near Gibbon, NE. Five landscape attributes, including a soil brightness image (red, green, and blue bands), elevation, and apparent electrical conductivity, were acquired for the field. A georeferenced soil-sampling scheme was used to determine soil chemical properties (soil pH, electrical conductivity, P, and organic matter). Georeferenced yield monitor data were collected for five (1997-2001) seasons. The five landscape attributes were aggregated into four MZ using principal-component analysis of landscape attributes and unsupervised classification of principal-component scores. All of the soil chemical properties differed among the four MZ. While yields were observed to differ by up to 25% between the highest- and lowest-yielding MZ in three of five seasons, receiving average precipitation, less-pronounced (5%) differences were noted among the same MZ in the driest and wettest seasons. This illustrates the significant role temporal variability plays in altering yield spatial variability, even under irrigation. Use of MZ for variable application of inputs like N would only have been appropriate for this field in three out of the five seasons, seriously restricting the use of this approach under variable environmental conditions. MenosRecent precision-agriculture research has focused on use of management zones (MZ) as a method for variable application of inputs like N. The objectives of this study were to determine (i) if landscape attributes could be aggregated into MZ that characterize spatial variation in soil chemical properties and corn yields and (ii) if temporal variability affects expression of yield spatial variability. This work was conducted on an irrigated cornfield near Gibbon, NE. Five landscape attributes, including a soil brightness image (red, green, and blue bands), elevation, and apparent electrical conductivity, were acquired for the field. A georeferenced soil-sampling scheme was used to determine soil chemical properties (soil pH, electrical conductivity, P, and organic matter). Georeferenced yield monitor data were collected for five (1997-2001) seasons. The five landscape attributes were aggregated into four MZ using principal-component analysis of landscape attributes and unsupervised classification of principal-component scores. All of the soil chemical properties differed among the four MZ. While yields were observed to differ by up to 25% between the highest- and lowest-yielding MZ in three of five seasons, receiving average precipitation, less-pronounced (5%) differences were noted among the same MZ in the driest and wettest seasons. This illustrates the significant role temporal variability plays in altering yield spatial variability, even under irrigation. Use of MZ for vari... Mostrar Tudo |
Palavras-Chave: |
Condições ambientais; Milho irrigado; Propriedades químicas; Solos; Variabilidade espacial. |
Thesagro: |
Agricultura de Precisão. |
Categoria do assunto: |
-- |
Marc: |
LEADER 02511naa a2200253 a 4500 001 1015490 005 2017-07-14 008 2004 bl uuuu u00u1 u #d 100 1 $aSCHEPERS A. R. 245 $aAppropriateness of management zones for characterizing spatial variability of soil properties and irrigated corn yields across years.$h[electronic resource] 260 $c2004 520 $aRecent precision-agriculture research has focused on use of management zones (MZ) as a method for variable application of inputs like N. The objectives of this study were to determine (i) if landscape attributes could be aggregated into MZ that characterize spatial variation in soil chemical properties and corn yields and (ii) if temporal variability affects expression of yield spatial variability. This work was conducted on an irrigated cornfield near Gibbon, NE. Five landscape attributes, including a soil brightness image (red, green, and blue bands), elevation, and apparent electrical conductivity, were acquired for the field. A georeferenced soil-sampling scheme was used to determine soil chemical properties (soil pH, electrical conductivity, P, and organic matter). Georeferenced yield monitor data were collected for five (1997-2001) seasons. The five landscape attributes were aggregated into four MZ using principal-component analysis of landscape attributes and unsupervised classification of principal-component scores. All of the soil chemical properties differed among the four MZ. While yields were observed to differ by up to 25% between the highest- and lowest-yielding MZ in three of five seasons, receiving average precipitation, less-pronounced (5%) differences were noted among the same MZ in the driest and wettest seasons. This illustrates the significant role temporal variability plays in altering yield spatial variability, even under irrigation. Use of MZ for variable application of inputs like N would only have been appropriate for this field in three out of the five seasons, seriously restricting the use of this approach under variable environmental conditions. 650 $aAgricultura de Precisão 653 $aCondições ambientais 653 $aMilho irrigado 653 $aPropriedades químicas 653 $aSolos 653 $aVariabilidade espacial 700 1 $aSHANAHAN, J. F. 700 1 $aLIEBIG, M. A. 700 1 $aSCHEPERS, J. S. 700 1 $aJOHNSON, S. H. 700 1 $aLUCHIARI JUNIOR, A. 773 $tAgronomy Journal, Madison$gv. 96, n.1, p. 195-203, 2004.
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Embrapa Meio Ambiente (CNPMA) |
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| Acesso ao texto completo restrito à biblioteca da Embrapa Gado de Corte. Para informações adicionais entre em contato com cnpgc.biblioteca@embrapa.br. |
Registro Completo
Biblioteca(s): |
Embrapa Gado de Corte. |
Data corrente: |
21/03/1991 |
Data da última atualização: |
21/03/1991 |
Autoria: |
ENCARNAÇÃO, R. de O. |
Afiliação: |
EMBRAPA. Centro Nacional de Pesquisa de Gado de Corte (Campo Grande, MS). |
Título: |
Estresse e produção animal. |
Ano de publicação: |
1989 |
Fonte/Imprenta: |
In: VALLE, E. R. do; SOARES, M. R. J.; SCHENK, M. A. M. Coletânea de seminários técnicos 1986/88. Campo Grande, MS: EMBRAPA-CNPGC, 1989. |
Páginas: |
p. 41-42. |
Série: |
(EMBRAPA-CNPGC. Documentos, 41). |
Idioma: |
Português |
Notas: |
CNPGC. |
Palavras-Chave: |
Estresse; Husbundry. |
Thesagro: |
Produção Animal; Stress. |
Categoria do assunto: |
-- |
Marc: |
LEADER 00591naa a2200193 a 4500 001 1318069 005 1991-03-21 008 1989 bl uuuu u00u1 u #d 100 1 $aENCARNAÇÃO, R. de O. 245 $aEstresse e produção animal. 260 $c1989 300 $ap. 41-42. 490 $a(EMBRAPA-CNPGC. Documentos, 41). 500 $aCNPGC. 650 $aProdução Animal 650 $aStress 653 $aEstresse 653 $aHusbundry 773 $tIn: VALLE, E. R. do; SOARES, M. R. J.; SCHENK, M. A. M. Coletânea de seminários técnicos 1986/88. Campo Grande, MS: EMBRAPA-CNPGC, 1989.
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