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Registro Completo |
Biblioteca(s): |
Embrapa Milho e Sorgo. |
Data corrente: |
12/01/2001 |
Data da última atualização: |
08/06/2018 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
ROSCOE, R.; VASCONCELLOS, C. A.; FURTINI NETO, A. E.; GUEDES, G. A. A.; FERNANDES, L. A. |
Afiliação: |
EMBRAPA-CNPMS. |
Título: |
Urease activity and its relation to soil organic matter, microbial biomass nitrogen and urea-nitrogen assimilation by maize in a Brazilian Oxisol under no-tillage and tillage systems. |
Ano de publicação: |
2000 |
Fonte/Imprenta: |
Biology and Fertility of Soils, Berlin, v. 32, n. 1, p. 52-59, 2000. |
Idioma: |
Inglês |
Conteúdo: |
We studied the relationship between urease activity (UA) and soil organic matter (SOM), microbial biomass N (Nbiom) content, and urea-N fertilizer assimilation by maize in a Dark Red Latosol (Typic Haplustox) cultivated for 9 years under no-tillage (NT), tillage with a disc plough (DP), and tillage with a moldboard plough (MP). Two soil depths were sampled (0-7.5 cm and 7.5-15 cm) at 4 different times during the crop cycle. Urea was applied at four different rates, ranging from 0 to 240 kg N ha-1. The levels of fertilizer N did not affect the UA, SOM content, and Nbiom content. No significant difference between the treatments (NT, DP, and MP) was observed for SOM during the experiment, probably because the major part of the SOM was in recalcitrant pools, since the area was previously cultivated (conventional tillage) for 20 years. The Nbiom content explained 97% and 69% of the variation in UA in the upper and deeper soil layer, respectively. UA and biomass N were significantly higher in the NT system compared to the DP and MP systems. The highest maize productivity and urea-N recovery was also observed for the NT system. We observed that the increase in urea-N losses under NT, possibly as a consequence of a higher UA, was compensated for by the increase in N immobilized in the biomass. |
Palavras-Chave: |
Maize. |
Thesagro: |
Biomassa; Matéria Orgânica; Milho; Nitrogênio; Plantio Direto; Solo; Uréase; Zea Mays. |
Thesaurus Nal: |
biomass; nitrogen; organic matter; soil; tillage; urea. |
Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
Marc: |
LEADER 02318naa a2200349 a 4500 001 1484478 005 2018-06-08 008 2000 bl uuuu u00u1 u #d 100 1 $aROSCOE, R. 245 $aUrease activity and its relation to soil organic matter, microbial biomass nitrogen and urea-nitrogen assimilation by maize in a Brazilian Oxisol under no-tillage and tillage systems.$h[electronic resource] 260 $c2000 520 $aWe studied the relationship between urease activity (UA) and soil organic matter (SOM), microbial biomass N (Nbiom) content, and urea-N fertilizer assimilation by maize in a Dark Red Latosol (Typic Haplustox) cultivated for 9 years under no-tillage (NT), tillage with a disc plough (DP), and tillage with a moldboard plough (MP). Two soil depths were sampled (0-7.5 cm and 7.5-15 cm) at 4 different times during the crop cycle. Urea was applied at four different rates, ranging from 0 to 240 kg N ha-1. The levels of fertilizer N did not affect the UA, SOM content, and Nbiom content. No significant difference between the treatments (NT, DP, and MP) was observed for SOM during the experiment, probably because the major part of the SOM was in recalcitrant pools, since the area was previously cultivated (conventional tillage) for 20 years. The Nbiom content explained 97% and 69% of the variation in UA in the upper and deeper soil layer, respectively. UA and biomass N were significantly higher in the NT system compared to the DP and MP systems. The highest maize productivity and urea-N recovery was also observed for the NT system. We observed that the increase in urea-N losses under NT, possibly as a consequence of a higher UA, was compensated for by the increase in N immobilized in the biomass. 650 $abiomass 650 $anitrogen 650 $aorganic matter 650 $asoil 650 $atillage 650 $aurea 650 $aBiomassa 650 $aMatéria Orgânica 650 $aMilho 650 $aNitrogênio 650 $aPlantio Direto 650 $aSolo 650 $aUréase 650 $aZea Mays 653 $aMaize 700 1 $aVASCONCELLOS, C. A. 700 1 $aFURTINI NETO, A. E. 700 1 $aGUEDES, G. A. A. 700 1 $aFERNANDES, L. A. 773 $tBiology and Fertility of Soils, Berlin$gv. 32, n. 1, p. 52-59, 2000.
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Embrapa Milho e Sorgo (CNPMS) |
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Biblioteca(s): |
Embrapa Recursos Genéticos e Biotecnologia. |
Data corrente: |
08/07/2005 |
Data da última atualização: |
14/07/2008 |
Autoria: |
CASTRO, P. K. G. de; FELIX, A. A. A.; MELO, L. A. M. P. de; MENDES, M. A. S. |
Título: |
Banco de dados de fungos em meloeiro (Cucumis melo). |
Ano de publicação: |
2004 |
Fonte/Imprenta: |
In: ENCONTRO DO TALENTO ESTUDANTIL DA EMBRAPA RECURSOS GENÉTICOS E BIOTECNOLOGIA, 9., 2004, Brasília, DF. Anais: resumos dos trabalhos. Brasília, DF: Embrapa Recursos Genéticos e Biotecnologia, 2004. |
Páginas: |
p. 154. |
Idioma: |
Português |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/CENARGEN/25243/1/tales2004.pdf
https://www.cenargen.embrapa.br/publica/talento/tales2004.pdf
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Marc: |
LEADER 00572nam a2200145 a 4500 001 1185842 005 2008-07-14 008 2004 bl uuuu u00u1 u #d 100 1 $aCASTRO, P. K. G. de 245 $aBanco de dados de fungos em meloeiro (Cucumis melo). 260 $aIn: ENCONTRO DO TALENTO ESTUDANTIL DA EMBRAPA RECURSOS GENÉTICOS E BIOTECNOLOGIA, 9., 2004, Brasília, DF. Anais: resumos dos trabalhos. Brasília, DF: Embrapa Recursos Genéticos e Biotecnologia$c2004 300 $ap. 154. 700 1 $aFELIX, A. A. A. 700 1 $aMELO, L. A. M. P. de 700 1 $aMENDES, M. A. S.
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