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Registro Completo |
Biblioteca(s): |
Embrapa Instrumentação. |
Data corrente: |
28/04/2003 |
Data da última atualização: |
28/04/2003 |
Autoria: |
BAYER, C.; MIELNICZUK, J.; MARTIN-NETO, L.; ERNANI, P. R. |
Afiliação: |
UFRGS, Departamento de Solos, Porto Alegre, RS; Embrapa Instrumentação Agropecuária, São Carlos, SP; UFSC, Departamento de Solos, Lages, SC. |
Título: |
Stocks and humidification degree of organic matter fractions as affected by no-tillage on a subtropical soil. |
Ano de publicação: |
2002 |
Fonte/Imprenta: |
Plant and Soil, Hague, v. 238, p. 133-140, 2002. |
Idioma: |
Inglês |
Conteúdo: |
Assessment of particulata (>53-mi) and mineral-associated (<53-mi) soil organic matter (SOM) fractions is a useful approach to understand the dynamic of organic matter in soils. This study aimed to compare the long-term (9-yr) effects of no-tillage (NT) and conventional tillage (CT) on C and N stocks in the two above mentioned organic fractions in a Brazilian Acrisol. The degree of SOM humification, which has been associated with the concentration of semiquinone-type free radicals ("spin") determined by electron spin resonance (ESR), was also evaluated. Soil under no-tillage had 7.55 Mg ha-1 (25%0 more C and 741 kg ha-1 (29%) more Ne than conventionally tilled soil in the 0-175-mm depth. Both particulate and mineral-associated SOM increased in the no-tilled soil. The incrase of C and N stocks in the mineral-associated SOM accounted for 75% and 91% of the difference in total soil C and N stocks between NT and CT, respectively. Averaged across tillage systems, C and N stocks were respectively 4.6 and 16.8 times higher in the mineal-associated SOM than in particulate SOM. The higher C and N stocks were associated with greater recalcitrance of mineral-associated SOM to biological decomposition, resultin, probably, from its interaction with variable charge minerals. This is corroborated by a positive relationship between concentrations of C and iron oxides and kaolinite in the 53-20, 20-2 and <2-mi particle size classes, of the 0-25-mm soil layer. The degree of SOM humification, assessed by ESR, decreased in both the 53-20 and 20-2-mi fractions under NT. However, it was unaffected by tillage in the <2-mi fraction, which mormally presented the lowest "spin" concentration. Since quality as well as quantity of SOM improved in the no-tillage soil, adoption of this system is highly recommended for amelioration of degraded tropical and sutropical solis. MenosAssessment of particulata (>53-mi) and mineral-associated (<53-mi) soil organic matter (SOM) fractions is a useful approach to understand the dynamic of organic matter in soils. This study aimed to compare the long-term (9-yr) effects of no-tillage (NT) and conventional tillage (CT) on C and N stocks in the two above mentioned organic fractions in a Brazilian Acrisol. The degree of SOM humification, which has been associated with the concentration of semiquinone-type free radicals ("spin") determined by electron spin resonance (ESR), was also evaluated. Soil under no-tillage had 7.55 Mg ha-1 (25%0 more C and 741 kg ha-1 (29%) more Ne than conventionally tilled soil in the 0-175-mm depth. Both particulate and mineral-associated SOM increased in the no-tilled soil. The incrase of C and N stocks in the mineral-associated SOM accounted for 75% and 91% of the difference in total soil C and N stocks between NT and CT, respectively. Averaged across tillage systems, C and N stocks were respectively 4.6 and 16.8 times higher in the mineal-associated SOM than in particulate SOM. The higher C and N stocks were associated with greater recalcitrance of mineral-associated SOM to biological decomposition, resultin, probably, from its interaction with variable charge minerals. This is corroborated by a positive relationship between concentrations of C and iron oxides and kaolinite in the 53-20, 20-2 and <2-mi particle size classes, of the 0-25-mm soil layer. The degree of SOM humification,... Mostrar Tudo |
Palavras-Chave: |
Clima subtropical; Electron spin resonance; Grau de humificação; Particulate soil organic matter; Subtropical climate. |
Thesagro: |
Matéria Orgânica; Solo. |
Thesaurus Nal: |
no-tillage. |
Categoria do assunto: |
-- |
Marc: |
LEADER 02632naa a2200253 a 4500 001 1024620 005 2003-04-28 008 2002 bl --- 0-- u #d 100 1 $aBAYER, C. 245 $aStocks and humidification degree of organic matter fractions as affected by no-tillage on a subtropical soil. 260 $c2002 520 $aAssessment of particulata (>53-mi) and mineral-associated (<53-mi) soil organic matter (SOM) fractions is a useful approach to understand the dynamic of organic matter in soils. This study aimed to compare the long-term (9-yr) effects of no-tillage (NT) and conventional tillage (CT) on C and N stocks in the two above mentioned organic fractions in a Brazilian Acrisol. The degree of SOM humification, which has been associated with the concentration of semiquinone-type free radicals ("spin") determined by electron spin resonance (ESR), was also evaluated. Soil under no-tillage had 7.55 Mg ha-1 (25%0 more C and 741 kg ha-1 (29%) more Ne than conventionally tilled soil in the 0-175-mm depth. Both particulate and mineral-associated SOM increased in the no-tilled soil. The incrase of C and N stocks in the mineral-associated SOM accounted for 75% and 91% of the difference in total soil C and N stocks between NT and CT, respectively. Averaged across tillage systems, C and N stocks were respectively 4.6 and 16.8 times higher in the mineal-associated SOM than in particulate SOM. The higher C and N stocks were associated with greater recalcitrance of mineral-associated SOM to biological decomposition, resultin, probably, from its interaction with variable charge minerals. This is corroborated by a positive relationship between concentrations of C and iron oxides and kaolinite in the 53-20, 20-2 and <2-mi particle size classes, of the 0-25-mm soil layer. The degree of SOM humification, assessed by ESR, decreased in both the 53-20 and 20-2-mi fractions under NT. However, it was unaffected by tillage in the <2-mi fraction, which mormally presented the lowest "spin" concentration. Since quality as well as quantity of SOM improved in the no-tillage soil, adoption of this system is highly recommended for amelioration of degraded tropical and sutropical solis. 650 $ano-tillage 650 $aMatéria Orgânica 650 $aSolo 653 $aClima subtropical 653 $aElectron spin resonance 653 $aGrau de humificação 653 $aParticulate soil organic matter 653 $aSubtropical climate 700 1 $aMIELNICZUK, J. 700 1 $aMARTIN-NETO, L. 700 1 $aERNANI, P. R. 773 $tPlant and Soil, Hague$gv. 238, p. 133-140, 2002.
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Embrapa Instrumentação (CNPDIA) |
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Registros recuperados : 25 | |
10. | | NACHTIGALL, G. R.; CARGNINO, C.; ERNANI, P. R.; LIMA, C. M. de. Projeto Redemaçã avalia efeito da irrigação e fertirrigação na cultura da macieira - parte 1. Jornal da Fruta, Lages, v. 21, n. 268, p. 19-21, jun. 2013. Publicado também no Agapomi, Vacaria, n. 229, p. 6-7, jun. 2013.Tipo: Artigo de Divulgação na Mídia |
Biblioteca(s): Embrapa Uva e Vinho. |
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11. | | NACHTIGALL, G. R.; CARGNINO, C.; ERNANI, P. R.; LIMA, C. M. de. Projeto Redemaçã avalia efeito da irrigação e fertirrigação na cultura da macieira - parte II. Jornal da Fruta, Lages v. 21, n. 269, p. 19-21, juL. 2013. Publicado também no Agapomi, Vacaria, n. 230, p. 6-7, jul. 2013.Tipo: Artigo de Divulgação na Mídia |
Biblioteca(s): Embrapa Uva e Vinho. |
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12. | | ERNANI, P. R.; ALMEIDA, J. A. de; SANTOS, F. C. dos. Potássio. In: NOVAIS, R. F.; ALVAREZ V., V. H.; BARROS, N. F. de; FONTES, R. L. F.; CANTARUTTI, R. B.; NEVES, J. C. L. (Ed.). Fertilidade do solo. Viçosa, MG: Sociedade Brasileira de Ciência do Solo, 2007. cap. 9, p. 551-594.Tipo: Capítulo em Livro Técnico-Científico |
Biblioteca(s): Embrapa Cerrados. |
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15. | | BRUNETTO, G.; ERNANI, P. R.; MELO, G. W. B. de; NAVA, G. Frutíferas. In: MANUAL de calagem e adubação para os estados do Rio Grande do Sul e de Santa Catarina. 11. ed. Porto Alegre: Sociedade Brasileira de Ciência do Solo, Núcleo Regional Sul, Comissão de Química e Fertilidade do Solo - RS/SC, 2016. p. 189-232Tipo: Capítulo em Livro Técnico-Científico |
Biblioteca(s): Embrapa Clima Temperado. |
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17. | | AMARANTE, C. V. T. do; ERNANI, P. R.; BLUM, L. E. B.; MEGGUER, C. A. Thidiazuron effects on shoot growth, return bloom, fruit set and nutrition of apples. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 37, n. 10, p. 1365-1371, out. 2002 Título em português: Efeito do thidiazuron no crescimento, no florescimento, na frutificação e na nutrição em macieiras.Biblioteca(s): Embrapa Unidades Centrais. |
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19. | | GERBER, J. M.; NAVA, G.; ERNANI, P. R.; CIOTTA, M. N.; AMARANTE, C. V. T. do; COLDEBELLA, M. C. Quality of 'Fuji Suprema' apples influenced by long-term annual addition of phosphorus to the soil. Ciência Rural, Santa Maria, v. 48, n. 9, e 20180057, 2018. p. 1-7Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 2 |
Biblioteca(s): Embrapa Clima Temperado. |
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20. | | CARGNINO, C.; SÁ, A. A. de; LIMA, C. M. de; SARAIVA, M. D.; NACHTIGALL, G. R.; ERNANI, P. R. Crescimento de frutos de macieira Maxigala submetida a tratamentos de irrigação e fertirrigação. In: CONGRESSO BRASILEIRO DE FRUTICULTURA, 22., 2012, Bento Gonçalves. Anais... Bento Gonçalves: SBF, 2012. p. 6142-6145.Tipo: Artigo em Anais de Congresso |
Biblioteca(s): Embrapa Uva e Vinho. |
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Registros recuperados : 25 | |
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